CN113324692B

CN113324692B - Pressure gauge and quick calibration method and pressure calibration device thereof

Info

Publication number: CN113324692B
Application number: CN202110756171.7A
Authority: CN
Inventors: 姜维利
Original assignee: Beijing Const Instruments Technology Inc
Current assignee: Beijing Const Instruments Technology Inc
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2024-07-16
Anticipated expiration: 2041-07-05
Also published as: CN113324692A

Abstract

The application provides a pressure gauge, a quick calibration method and a pressure calibration device thereof, which comprise a first pressure sensor, a second pressure sensor, a working pressure interface and a quick calibration pressure interface, wherein a first pressure sensing surface of the first pressure sensor and a first pressure sensing surface of the second pressure sensor are communicated with the working pressure interface, a second pressure sensing surface of the first sensor is communicated with the quick calibration pressure interface, a second pressure sensing surface of the second sensor is communicated with the atmosphere, the working pressure interface is communicated with a measured pressure source in a quick calibration mode, the quick calibration pressure interface is communicated with the calibration pressure source, the first pressure sensor measures the relative pressure of the measured pressure source and the calibration pressure source, and the second pressure sensor measures the measured pressure. The application can realize the calibration of the pressure gauge under the condition of keeping the pressure gauge and the measured pressure source continuously communicated, and can ensure the tightness and the working continuity of the gas circuit of the measured pressure source to the greatest extent.

Description

Pressure gauge and quick calibration method and pressure calibration device thereof

Technical Field

The invention relates to the technical field of pressure measurement and calibration, in particular to a pressure gauge with the capability of quick calibration without disassembly and assembly, a quick calibration method for the pressure gauge and a pressure calibration device for calibrating the pressure gauge.

Background

The pressure gauge is an industrial instrument for measuring pressure, as shown in fig. 1, the pressure gauge in the prior art comprises a pressure sensor 010, an analog-to-digital conversion unit 020, a data processing unit 030 and a display unit 040, a pressure measuring port 001 is arranged at the lower end part of the pressure gauge, a pressure sensing surface of the pressure sensor is communicated with the pressure measuring port 001, so that a working medium of load pressure is transmitted to the pressure sensor through the pressure measuring port, the pressure sensor 010 generates an analog electric signal representing a pressure value based on the pressure of the pressure sensing surface of the pressure sensor 010, the analog-to-digital conversion unit 020 is in signal connection with the pressure sensor 010, the analog electric signal is processed, the analog electric signal is converted into a digital electric signal representing the pressure value, the data processing unit 030 is in signal connection with the analog-to-digital conversion unit 020, the digital electric signal is processed after being obtained, the digital electric signal is converted into a display signal, the display unit 040 is in signal connection with the data processing unit 030, and the display is performed after the display signal is obtained, and the measured pressure value is displayed in the display unit.

In order to ensure that the measured indication value of the pressure gauge is sufficiently accurate and has sufficient feasibility, the pressure gauge needs to be calibrated periodically or irregularly, in the calibration process, the calibrated pressure gauge and the standard (for example, a pressure gauge with higher accuracy) need to be communicated to the same pressure source, the pressure source is used for providing the same calibration pressure for the calibrated pressure gauge and the standard, when the calibration pressure is stable, the measured pressure values of the calibrated pressure gauge and the standard are respectively obtained from the calibrated pressure gauge and the standard, and the deviation of the measured pressure values of the calibrated pressure gauge and the standard is the measured deviation condition of the calibrated pressure gauge, so that whether the calibrated pressure gauge has sufficient accuracy can be judged.

In order to calibrate the calibrated pressure gauge, the calibrated pressure gauge and the etalon need to be connected to the same pressure source, as described in the calibration procedure above.

Aiming at the situation, in the traditional operation, firstly, the pressure source is decompressed, the calibrated pressure gauge is detached from the pipeline after decompression is finished, then the calibration process is executed, and the calibrated pressure gauge is reinstalled on the pipeline after calibration is finished; obviously, in the conventional operation, each time the pressure gauge is calibrated, the whole working pipeline can stop working within a short period of time, and in the disassembly and assembly processes before and after the calibration, the leakage risk is inevitably increased.

To above-mentioned traditional operation, prior art has given a but novel manometer of normal position calibration's elastic element, including the manometer head, the valve body, rotatable tee bend ball valve, calibration passageway and medium isolating device, the manometer head is installed on the valve body, the manometer head is as an organic whole structure with the valve body, one side of valve body is equipped with the calibration source interface, rotatable tee bend ball valve is installed in the valve body, the calibration passageway sets up in the calibration mouth department, the one end and the rotatable tee bend ball valve of calibration passageway are connected, adjust pipeline intercommunication mode through the tee bend ball valve, thereby make or pressure sensor and calibration mouth intercommunication, or pressure sensor and measurement mouth intercommunication.

Although the above solution solves the problem of disassembly and assembly in the conventional operation to a certain extent, it does not perfectly solve the problem:

Leakage problems and risks are inevitably caused by the three-way ball valve or other valve structures, and as the sealing means are greatly limited (because the valve is required to be opened), the limited sealing means cannot achieve the expected sealing effect due to various factors such as manufacturing consistency, use abrasion and the like, so that the valve means are not allowed to appear on a working pipeline or a pressure gauge in many application scenes;

In addition, if the medium used in the working pipeline is a special medium, the pressure gauge of the prior art needs to use the special medium when calibrating, and the problem of processing the residual or leaked working medium in the pipeline switching process needs to be solved, and when the working medium is toxic or harmful substances, the problem is more remarkable.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a pressure gauge with the capability of quick calibration without disassembly and assembly, and provides a quick calibration method matched with the pressure gauge and a pressure calibration device.

A pressure gauge comprises a first pressure sensor, a second pressure sensor, a working pressure interface and a quick calibration pressure interface; the first pressure sensor and the second pressure sensor respectively comprise a first pressure sensing surface and a second pressure sensing surface, and the pressure sensors measure the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generate pressure signals; the first pressure sensing surface of the first pressure sensor and the first pressure sensing surface of the second pressure sensor are both communicated with the working pressure interface, the second pressure sensing surface of the first pressure sensor is communicated with the rapid calibration pressure interface, and the second pressure sensing surface of the second pressure sensor is communicated with the atmosphere; in a measurement mode, the working pressure interface is communicated with a measured pressure source, the rapid calibration pressure interface is communicated with the atmosphere, and the first pressure sensor and the second pressure sensor respectively measure the measured pressure and generate pressure signals; in the quick calibration mode, the working pressure interface is communicated with the measured pressure source, the quick calibration pressure interface is communicated with the calibration pressure source, the first pressure sensor measures the relative pressure of the measured pressure source and the calibration pressure source and generates a pressure signal, and the second pressure sensor measures the measured pressure and generates a pressure signal.

Preferably, the measurement deviation of the pressure gauge is determined based on the measured value of the first pressure sensor, the measured value of the second pressure sensor and the calibrated pressure value of the calibrated pressure source.

Preferably, the system further comprises a processing module and an information output module, wherein in the rapid calibration mode, the processing module records the measured value of the second pressure sensor at an earlier time, when the processing module obtains the measured value of the second pressure sensor at the current time, the difference between the measured value of the second pressure sensor at the current time and the measured value of the second pressure sensor at the earlier time is calculated, and the information output module outputs the calculation result of the processing module, wherein the earlier time and the current time are different times of the same rapid calibration operation.

Preferably, the system further comprises a processing module and an information input module, wherein in the rapid calibration mode, the processing module synchronously acquires the measured value of the first pressure sensor and the measured value of the second pressure sensor in a pressure stabilizing state, acquires and processes the calibration pressure value through the information input module, and the pressure stabilizing state is that the measured value of the first pressure sensor is stable or the calibration pressure value is stable.

Preferably, in the measurement mode, the measured pressure value is generated based on pressure signals of the first pressure sensor and the second pressure sensor.

Preferably, the working pressure interface is continuously in communication with the pressure source being measured when switching between the measurement mode and the rapid calibration mode.

The pressure gauge rapid calibration method is matched with the pressure gauge scheme, and comprises the steps of setting the pressure gauge in a rapid calibration mode; setting two or more target pressure values; controlling the calibration pressure source based on the calibration pressure value and the target pressure value, or the first pressure sensor measurement value and the target pressure value, so that the calibration pressure value or the first pressure sensor measurement value is stabilized at the target pressure value; acquiring a calibration pressure value, a first pressure sensor measurement value and a second pressure sensor measurement value when the pressure is stable; and judging the deviation condition of the measured value of the first pressure sensor according to the calibrated pressure value, the measured value of the first pressure sensor and the measured value of the second pressure sensor.

Preferably, the target pressure value is set to zero, and the calibration pressure source is controlled based on the measured value of the first pressure sensor and the target pressure value so that the measured value of the first pressure sensor is stabilized to zero.

Preferably, when the calibration pressure value is not lower than the atmospheric pressure, the calibration pressure source is controlled so that the calibration pressure value or the first pressure sensor measurement value is stabilized at the target pressure value with the higher calibration pressure and then stabilized at the target pressure value with the lower calibration pressure.

Preferably, the calibration pressure source is controlled to stabilize the calibration pressure value at atmospheric pressure.

Preferably, the deviation change condition of the first pressure sensor measurement value is judged according to two groups of calibration pressure values, a first pressure sensor measurement value and a second pressure sensor measurement value with different target pressure values.

Preferably, the calibration pressure source is controlled at least three times or more, so that the calibration pressure value or the first pressure sensor measurement value is stabilized at three or more target pressure values, three or more groups of calibration pressure values, the first pressure sensor measurement value and the second pressure sensor measurement value are obtained, a linear change curve of the first pressure sensor measurement value along with the calibration pressure value is fitted according to the three or more groups of calibration pressure values, and the measurement deviation condition of the pressure gauge is judged according to the distance between the linear change curve and the first pressure sensor measurement value.

The pressure gauge with the same design concept as the pressure gauge scheme comprises a pressure sensor module, a working pressure interface and a quick calibration pressure interface; the pressure sensor comprises a first pressure sensing surface and a second pressure sensing surface, and the pressure sensor measures the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generates a pressure signal; the working pressure interface is communicated with a first pressure sensing surface of the pressure sensor, and the quick calibration pressure interface is communicated with a second pressure sensing surface of the pressure sensor; in the measurement mode, the working pressure interface is communicated with a measured pressure source, the rapid calibration pressure interface is communicated with the atmosphere, and the pressure sensor measures the measured pressure and generates a pressure signal; in the rapid calibration mode, the working pressure interface is communicated with a continuously stable measured pressure source, the rapid calibration pressure interface is communicated with a calibration pressure source, and the first pressure sensor measures the relative pressure of the measured pressure source and the calibration pressure source and generates a pressure signal.

Preferably, the measurement deviation of the pressure gauge is determined based on the measured value of the pressure sensor and the calibrated pressure value of the calibrated pressure source.

Preferably, the system further comprises a processing module, and in the rapid calibration mode, the processing module synchronously acquires the measured value and the calibration pressure value of the pressure sensor in a steady-pressure state, wherein the steady-pressure state is that the measured value or the calibration pressure value of the pressure sensor is stable.

Preferably, the processing module compares the change value of the measured value of the pressure sensor with the change value of the calibration pressure value under different pressure stabilizing states, and judges the measurement deviation of the pressure gauge according to the comparison result, wherein the different pressure stabilizing states refer to different measured values of the corresponding pressure sensor or different calibration pressure values.

The pressure gauge rapid calibration method is matched with the pressure gauge scheme, and comprises the steps of setting the pressure gauge in a rapid calibration mode; setting two or more target pressure values; controlling the calibration pressure source based on the calibration pressure value and the target pressure value, or the first pressure sensor measurement value and the target pressure value, so that the calibration pressure value or the first pressure sensor measurement value is stabilized at the target pressure value; acquiring a calibration pressure value and a pressure sensor measurement value when the pressure is stable; and judging the deviation condition of the pressure sensor measured value according to the calibration pressure value and the pressure sensor measured value.

The pressure calibrating device comprises a standard pressure module, a measured pressure value acquisition module and a calibration information processing module, wherein the standard pressure module and the measured pressure value acquisition module are respectively connected with the calibration information processing module; the standard pressure module is used for measuring a calibration pressure value; the measured pressure value acquisition module is used for acquiring the measured pressure value from the calibrated pressure gauge; and the calibration information processing module is configured to quickly calibrate the calibrated pressure gauge according to the calibration pressure value and the measured pressure value.

Preferably, the system further comprises a built-in pressure generating module which is respectively connected with the standard pressure module and the calibration information processing module in a signal mode, and the built-in pressure generating module is configured to generate pressure according to the target pressure value and one of the calibration pressure value or the measured pressure value.

The beneficial effects are that:

1. The pressure gauge of the scheme of the application can realize the calibration of the pressure gauge on the basis that the pressure gauge is not detached from the pressure source to be measured and special adjustment is not needed, so that the tightness and the working continuity of the gas path of the pressure source to be measured can be ensured to the greatest extent before the pressure gauge is damaged or the effective life cycle is finished, the working efficiency is improved, and the gas path leakage risk caused by repeated detachment and installation of the pressure gauge is reduced;

2. When realizing former beneficial effect, the working medium of being measured pressure source is kept apart in pressure sensor's one side completely, all need not to set up the valve structure that probably leads to the gas circuit to leak in being measured pressure source and the manometer to the furthest has avoided external impurity to get into the pressure source of being measured, has also avoided the working medium of being measured pressure source to be taken to outside.

Drawings

FIG. 1 is a schematic diagram of a prior art pressure gauge architecture connection.

Fig. 2 is a schematic diagram of a measurement mode architecture connection of a pressure gauge according to an example of the present application.

FIG. 3 is a schematic diagram of a fast calibration mode architecture connection of an exemplary pressure gauge of the present application.

Fig. 4 is a schematic diagram of a measurement mode architecture connection of a pressure gauge according to another example of the present application.

FIG. 5 is a schematic diagram of a fast calibration mode architecture connection of a pressure gauge according to another example of the present application.

FIG. 6 is a schematic diagram of the structural connections of a pressure gauge according to yet another example of the present application.

FIG. 7 is a schematic diagram of a measurement mode architecture connection of a pressure gauge according to yet another example of the present application.

FIG. 8 is a schematic diagram of a fast calibration mode architecture connection of a pressure gauge according to yet another example of the present application.

FIG. 9 is a flow chart of a method of rapid calibration of a pressure gauge of yet another example of the application.

FIG. 10 is a schematic diagram of a measurement mode architecture connection of a pressure gauge according to yet another example of the present application.

FIG. 11 is a schematic diagram of a fast calibration mode architecture connection of a pressure gauge according to yet another example of the present application.

Fig. 12 is a schematic diagram of the structural connection of the pressure calibrator according to an example of the present application.

Reference numerals:

101. Working pressure interface, 102, quick calibration pressure interface, 110, first pressure sensor, 111, first pressure sensing surface (of first pressure sensor), 112, second pressure sensing surface (of first pressure sensor), 120, second pressure sensor, 121, first pressure sensing surface (of second pressure sensor), 122, second pressure sensing surface (of second pressure sensor), 130, processing module, 140, information output module, 150, information input module;

201. working pressure interface 202, quick calibration pressure interface 210, pressure sensor module 211, first pressure sensing surface (of pressure sensor) 212, second pressure sensing surface (of pressure sensor) 230, processing module 240, information output module 250, information input module;

301. Working pressure interface, 302, quick calibration pressure interface, 303, gauge outfit, 304, pressure acquisition module, 305, fixed structure (of gauge outfit), 306, signal connection (of gauge outfit), 307, fixed structure (of pressure acquisition module), 308, signal connection (of pressure acquisition module), 309, signal processing circuit board (of pressure acquisition module), 310, first pressure sensor, 311, first pressure sensing face (of first pressure sensor), 312, second pressure sensing face (of first pressure sensor), 320, second pressure sensor, 321, first pressure sensing face (of second pressure sensor), 322, second pressure sensing face (of second pressure sensor), 330, processing module, 340, display screen;

401. Working pressure interface 402, quick calibration pressure interface 410, pressure sensor 411, first pressure sensing surface 412, second pressure sensing surface 430, processing module 431, analog-to-digital conversion circuit 440, display screen;

610. The system comprises a standard pressure module 620, a measured pressure value acquisition module 621, a second wired communication interface 622, a second wireless communication module 623, a camera 624, an image information processing module 630, a calibration information processing module 640, a built-in pressure generation module 650 and an input module;

710. measured pressure source, 730, calibrated pressure source.

Detailed Description

The present application is described in detail below, and detailed descriptions of known techniques are omitted if they are not necessary for the features of the present application shown. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Detailed description of the preferred embodiments

As illustrated in fig. 2 and 3, a pressure gauge includes a first pressure sensor 110, a second pressure sensor 120, a working pressure port 101, and a quick calibration pressure port 102.

The first pressure sensor 110 includes a first pressure sensing surface 111 and a second pressure sensing surface 112, and measures the relative pressures of the first pressure sensing surface and the second pressure sensing surface thereof and generates a pressure signal;

The second pressure sensor 120 includes a first pressure sensing surface 121 and a second pressure sensing surface 122, and the second pressure sensor measures the relative pressures of the first pressure sensing surface and the second pressure sensing surface thereof and generates a pressure signal;

A working pressure port 101, configured to communicate with a pressure source to be measured, so that the first pressure sensor and the second pressure sensor can measure the pressure of the pressure source to be measured, where the pressure source to be measured may be a pipeline, a container or other equipment facility that needs a pressure gauge to measure the pressure of the pressure source to be measured;

a rapid calibration pressure interface 102 for communicating with a calibration pressure source and acquiring a calibration pressure at the time of rapid calibration;

The first pressure sensing surface 111 of the first pressure sensor and the first pressure sensing surface 121 of the second pressure sensor are both communicated with the working pressure interface 101, the second pressure sensing surface 112 of the first pressure sensor is communicated with the rapid calibration pressure interface 102, and the second pressure sensing surface 122 of the second pressure sensor is communicated with the atmosphere.

The pressure gauge comprises a gauge pressure measurement mode and a quick calibration mode:

in the measurement mode, the working pressure interface 101 is communicated with the measured pressure source 710, the rapid calibration pressure interface 102 is communicated with the atmosphere, and the first pressure sensor 110 and the second pressure sensor 120 respectively measure the measured pressure and generate pressure signals;

in the rapid calibration mode, the working pressure port 101 is in communication with the pressure source under test 710, the rapid calibration pressure port 102 is in communication with the calibration pressure source 730, the first pressure sensor 110 measures the relative pressure of the pressure source under test and the calibration pressure source and generates a pressure signal, and the second pressure sensor 120 measures the pressure under test and generates a pressure signal.

In the quick calibration mode, the calibration pressure provided by the calibration pressure source can be accurately measured through the standard device, and the second pressure sensor can not directly measure the standard pressure value of the measured pressure source even though the accuracy is low or deviation exists, but because the measured pressure source (namely, normal pipeline working pressure) is generally stable or fluctuates within a certain range, the deviation of the second pressure sensor is basically stable within the range, the second pressure sensor can accurately measure the pressure change condition of the measured pressure source sufficiently, on the basis, two or more calibration pressure values can be obtained by configuring the calibration pressure source, and correspondingly, as the first pressure sensor measures the relative pressure of the measured pressure source and the calibration pressure source, two or more first measurement pressure values can also be obtained along with the change of the calibration pressure source, and accordingly, whether the first measurement pressure value is sufficiently accurate (whether deviation exists) can be judged under the condition that the change condition of the standard pressure value of the measured pressure source can be accurately measured through the second pressure sensor.

The distinguishing points and/or beneficial effects of this example over the prior art are: the pressure gauge of this example provides the hardware support that carries out quick calibration to the pressure gauge under the condition of not dismantling from the operating pressure pipeline (i.e. by the pressure source) and simultaneously, when switching each other between measurement mode and quick calibration mode, the pipeline switch only goes on in quick calibration pressure interface department, and quick calibration pressure interface and operating pressure interface and by the pressure source by the physical isolation, therefore, pipeline switch does not have the influence to by the pressure source, just has stopped the leakage risk really.

The pressure gauge of the foregoing example of this particular embodiment is modified by the following schemes:

Judging the measurement deviation of the pressure gauge according to the measured value of the first pressure sensor, the measured value of the second pressure sensor and the calibrated pressure value of the calibrated pressure source; specifically, this determination operation may be performed entirely by the pressure gauge itself, entirely by the calibrator, or calculated by the pressure gauge, and the determination may be performed by the calibrator.

The pressure gauge further includes a processing module 130 and an information output module 140, wherein the processing module 130 acquires and processes pressure signals from the first pressure sensor 110 and the second pressure sensor 120, respectively (thus, the processing module 130 is in signal connection with the first pressure sensor 110 and the second pressure sensor 120, respectively), and the information output module 140 outputs processing results of the processing module (thus, the information output module 140 is in signal connection with the processing module 130); in the measurement mode, according to different specific hardware configurations, if the accuracy of the second pressure sensor is lower than that of the first pressure sensor, the processing module uses the pressure value corresponding to the pressure signal of the first pressure sensor as the pressure indication value to be displayed, uses the pressure value corresponding to the pressure signal of the second pressure sensor as a reference, and if the accuracy of the second pressure sensor is not lower than that of the first pressure sensor, the processing module uses the average value of the pressure value corresponding to the pressure signal of the first pressure sensor and the pressure value corresponding to the pressure signal of the second pressure sensor as the pressure indication value to be displayed, wherein the average value can be an arithmetic average value or a weighted average value.

In the fast calibration mode, the processing module 130 calculates a difference between the measured values of the second pressure sensor 120 and the first pressure sensor 110, and the information output module 140 outputs a calculation result of the processing module 130; and the calculation result output by the information output module is the measured value of the second pressure sensor and the first pressure sensor on the calibration pressure source.

In the quick calibration mode, the processing module 130 records the measured value of the second pressure sensor at an earlier time, when the processing module 130 acquires the measured value of the second pressure sensor at the current time, the difference between the measured value of the second pressure sensor at the current time and the measured value of the second pressure sensor at the earlier time is calculated, and the information output module outputs the calculation result of the processing module, wherein the earlier time and the current time are different times of the same quick calibration operation; the fluctuation of the measured pressure source can be obtained very intuitively based on the calculation result output by the information output module, and the calculation result output by the information output module has extremely high accuracy for describing the fluctuation of the pressure because the measured pressure source generally fluctuates within a small range (because the calculation process basically eliminates the possible deviation of the second pressure sensor).

The pressure gauge further comprises an information input module 150, and in the rapid calibration mode, the processing module 130 obtains a calibration pressure value of the calibration pressure source through the information input module 150; in the case of obtaining a calibrated pressure value, the processing module 130 may complete all of the computing tasks associated with the rapid calibration.

The processing module 130 synchronously acquires and processes the measured value of the first pressure sensor, the measured value of the second pressure sensor and the calibrated pressure value in a steady state, wherein the steady state is that the measured value of the first pressure sensor is stable or the calibrated pressure value is stable.

The processing module 130 performs the following equation 1 calculations:

Δp= (P ₂₁-P₂₂)-(P₃₁-P₃₂)-(P₁₁-P₁₂) equation 1

In formula 1, P ₁₁、P₂₁ and P ₃₁ are respectively a measured value of the first pressure sensor, a measured value of the second pressure sensor and a calibration pressure value in the first pressure stabilizing state, and P ₁₂、P₂₂ and P ₃₂ are respectively a measured value of the first pressure sensor, a measured value of the second pressure sensor and a calibration pressure value in the second pressure stabilizing state, where the calibration pressure values corresponding to the first pressure stabilizing state and the second pressure stabilizing state are different.

The processing module 130 pre-stores the allowable error of the pressure gauge, compares the absolute value of the delta P with the allowable error, and outputs prompt information through the information output module when the absolute value of the delta P is larger than the allowable error.

In the measurement mode, the processing module 130 generates a measured pressure value based on the pressure signals of the first pressure sensor 110 and the second pressure sensor 120.

The working pressure interface 101 is continuously in communication with the measured pressure source 710 when switching between the measurement mode and the quick calibration mode.

Based on the pressure gauge of the previous example and the improvement scheme thereof, the quick calibration method of the pressure gauge comprises the following steps of

Setting the pressure gauge in a fast calibration mode;

setting two or more target pressure values;

Controlling the calibration pressure source based on the calibration pressure value and the target pressure value, or the first pressure sensor measurement value and the target pressure value, so that the calibration pressure value or the first pressure sensor measurement value is stabilized at the target pressure value;

Acquiring a calibration pressure value, a first pressure sensor measurement value and a second pressure sensor measurement value when the pressure is stable;

And judging the deviation condition of the measured value of the first pressure sensor according to the calibrated pressure value, the measured value of the first pressure sensor and the measured value of the second pressure sensor.

The method for quickly calibrating the pressure gauge according to the foregoing example of the present embodiment is improved by setting the target pressure value to zero, and controlling the calibration pressure source based on the measured value of the first pressure sensor and the target pressure value to make the measured value of the first pressure sensor stable to zero.

When the calibration pressure value is not lower than the atmospheric pressure, the calibration pressure source is controlled to enable the calibration pressure value or the measured value of the first pressure sensor to be stabilized at a target pressure value with higher calibration pressure and then stabilized at a target pressure value with lower calibration pressure.

The calibration pressure source is controlled to stabilize the calibration pressure value at atmospheric pressure.

And judging the deviation change condition of the measured value of the first pressure sensor according to two groups of calibration pressure values, the measured value of the first pressure sensor and the measured value of the second pressure sensor with different target pressure values.

When the deviation change of the measured value of the first pressure sensor exceeds the allowable error and is smaller than twice of the allowable error, at least one group of calibration pressure values, a measured value of the first pressure sensor and a measured value of the second pressure sensor, which are different in target pressure value, are additionally introduced, and the deviation change condition of the measured value of the first pressure sensor is judged according to three or more groups of calibration pressure values, the measured value of the first pressure sensor and the measured value of the second pressure sensor, which are different in target pressure value.

And when the deviation change of the measured value of the first pressure sensor exceeds twice of the allowable error, judging that the first pressure sensor has an out-of-tolerance condition.

And controlling the calibration pressure source at least three times or more, stabilizing the calibration pressure value or the first pressure sensor measurement value at three or more target pressure values, obtaining three or more groups of calibration pressure values, the first pressure sensor measurement value and the second pressure sensor measurement value, fitting a linear change curve of the first pressure sensor measurement value along with the calibration pressure value according to the three or more groups of calibration pressure values, and judging the measurement deviation condition of the pressure gauge according to the distance between the linear change curve and the first pressure sensor measurement value.

As another example, based on the foregoing technical solution, a simplified design is performed, as shown in fig. 4 and 5, a pressure gauge includes a pressure sensor module 210, a working pressure interface 201, and a quick calibration pressure interface 202;

The pressure sensor 210 comprises a first pressure sensing surface 211 and a second pressure sensing surface 212, the pressure sensor 210 measures the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generates a pressure signal, the working pressure interface 201 is communicated with the first pressure sensing surface 211 of the pressure sensor, and the quick calibration pressure interface 202 is communicated with the second pressure sensing surface 212 of the pressure sensor;

In the measurement mode, the working pressure interface 201 is communicated with the measured pressure source 710, the rapid calibration pressure interface 202 is communicated with the atmosphere, and the pressure sensor 210 measures the measured pressure and generates a pressure signal;

In the rapid calibration mode, the working pressure port 201 is in communication with a continuously stable measured pressure source 710, the rapid calibration pressure port 202 is in communication with a calibrated pressure source 730, and the pressure sensor 210 measures the relative pressures of the measured pressure source and the calibrated pressure source and generates a pressure signal.

Further improvements include the following.

And judging the measurement deviation of the pressure gauge according to the measured value of the pressure sensor and the calibrated pressure value of the calibrated pressure source.

The system further comprises a processing module 230, an information input module 250 and an information output module 240, wherein in the rapid calibration mode, the processing module 230 obtains a calibration pressure value of the calibration pressure source through the information input module 250, processes the calibration pressure value and a measured value of the pressure sensor, and then outputs a processing result through the information output module 240.

The processing module 230 synchronously acquires the measured value and the calibration pressure value of the pressure sensor in a steady state, wherein the steady state is that the measured value or the calibration pressure value of the pressure sensor is stable.

The processing module 230 compares the change value of the measured value of the pressure sensor with the change value of the calibration pressure value under different pressure stabilizing states, and judges the measurement deviation of the pressure gauge according to the comparison result, wherein the different pressure stabilizing states refer to different measured values of the corresponding pressure sensor or different calibration pressure values.

The working pressure interface 201 is continuously in communication with the measured pressure source 710 when switching between the measurement mode and the quick calibration mode.

Based on the simplified scheme of the pressure gauge, the quick calibration method of the pressure gauge comprises the following steps of

Setting the pressure gauge in a fast calibration mode;

setting two or more target pressure values;

acquiring a calibration pressure value and a pressure sensor measurement value when the pressure is stable;

and judging the deviation condition of the pressure sensor measured value according to the calibration pressure value and the pressure sensor measured value.

Second embodiment

By way of example, as shown in fig. 6, a pressure gauge includes a gauge outfit 303 and a pressure acquisition module 304;

The gauge outfit 303 openly is equipped with display screen 340 for show pressure value information, the inside of gauge outfit 303 is equipped with processing module 330 for information processing, and gauge outfit 303 lower extreme is used for being equipped with fixed knot structure 305 and signal connection portion 306 with pressure acquisition module adaptation connection, and fixed knot constructs and is used for fixed gauge outfit and pressure acquisition module mutually, and signal connection portion is used for establishing signal connection with pressure acquisition module, processing module 330 respectively with signal connection portion 306 and the display screen 340 signal connection of gauge outfit.

The lower end face of the pressure acquisition module 304 is provided with a working pressure interface 301, and when the pressure gauge is used for pressure measurement, the working pressure interface 301 is communicated with a measured pressure source 710;

The first pressure sensor 310 and the second pressure sensor 320 are arranged inside the pressure acquisition module 304, the first pressure sensor 310 comprises a first pressure sensing surface 311 and a second pressure sensing surface 312, the first pressure sensor measures the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generates a first pressure signal representing a measured pressure value, the second pressure sensor 320 comprises a first pressure sensing surface 321 and a second pressure sensing surface 322, and the second pressure sensor measures the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generates a second pressure signal representing a measured pressure value; the side of the pressure acquisition module is provided with a quick calibration pressure interface 302, when the pressure gauge is used for pressure measurement, the quick calibration pressure interface 302 is used for being communicated with a reference pressure source, and for gauge pressure measurement, the reference pressure source is the atmosphere;

The first pressure sensing surface 311 of the first pressure sensor, the first pressure sensing surface 321 of the second pressure sensor and the working pressure interface 301 are communicated, and the communication can be realized through a pressure guiding pipe or other pressure guiding structures, or the first pressure sensing surface of the first pressure sensor and/or the first pressure sensing surface of the second pressure sensor is directly arranged at the working pressure interface;

the second pressure sensing surface 312 of the first pressure sensor is communicated with the rapid calibration pressure interface 302, and the second pressure sensing surface 322 of the second pressure sensor is communicated with the atmosphere, which means that, although the rapid calibration pressure interface is communicated with the atmosphere (i.e. the reference pressure source) when the pressure gauge is used for pressure measurement, at least the second pressure sensing surface of the first pressure sensor and the second pressure sensing surface of the second pressure sensor are not communicated inside the pressure acquisition module, nor are the second pressure sensing surface of the second pressure sensor and the rapid calibration pressure interface communicated inside the pressure acquisition module or the pressure gauge, i.e. the second pressure sensing surface of the first pressure sensor and the second pressure sensing surface of the second pressure sensor are respectively communicated with the atmosphere in the gauge pressure measurement mode;

The upper end part of the pressure acquisition module 304 is provided with a fixing structure 307 and a signal connection part 308 which are matched with the gauge outfit, the fixing structure 307 is used for fixing the pressure acquisition module and the gauge outfit, and the signal connection part 308 is used for establishing signal connection with the gauge outfit;

According to different hardware configurations of the two pressure sensors, if the pressure sensors directly output digital signals which can be identified and used by the processing module, the pressure sensors are directly connected with the signal connection part of the pressure acquisition module in a signal mode, if the pressure sensors output analog signals (for example, 4-20mA current signals), a signal processing circuit board 309 for performing analog-to-digital conversion is further arranged inside the pressure acquisition module, and the signal processing circuit board 309 is respectively connected with the two pressure sensors (310 and 320) and the signal connection part 308 of the pressure acquisition module in a signal mode (the situation is shown in the drawing). 001. The pressure measuring device comprises a pressure measuring port 010, a pressure sensor 020, an analog-to-digital conversion unit 030, a data processing unit 040 and a display unit;

The pressure gauge of the present example includes two modes of operation, one being a measurement mode and the other being a quick calibration mode.

As shown in fig. 7, in the measurement mode, the pressure gauge is a gauge pressure gauge in normal use, the working pressure port 301 is connected to the measured pressure source 710 (the general concept of the measured pressure source is described in the first embodiment, and is not repeated here), the fast calibration pressure port 302 is connected to the atmosphere, where the first pressure sensor 310 measures the relative pressure of the measured pressure source with respect to the atmosphere, i.e. the gauge pressure of the measured pressure source, and generates a first pressure signal (analog electrical signal) representing the measured pressure value, the second pressure sensor 320 measures the relative pressure of the measured pressure source with respect to the atmosphere, and generates a second pressure signal (analog electrical signal) representing the measured pressure value, and the first pressure signal and the second pressure signal are processed by the signal processing circuit board 309, respectively, to generate a first measured pressure value (digital signal) and a second measured pressure value (digital signal) corresponding to the first pressure signal.

In one possible gauge pressure measurement, a first measured pressure value and a second measured pressure value are communicated from the signal processing circuit board 309 to the processing module 330; the processing module compares the first measured pressure value with the second measured pressure value, if the difference between the first measured pressure value and the second measured pressure value is extremely small (for example, smaller than the allowable error of the pressure gauge), a display signal is generated according to the first measured pressure value, the display screen 340 acquires the display signal and displays the display signal, and the information displayed by the display screen 340 comprises the first measured pressure value; if the difference between the two signals is larger (for example, larger than the allowable error of the pressure gauge), a display signal is still generated and displayed according to the first measured pressure value, and meanwhile, the signal contained in the display signal and displayed on the display screen 340 also comprises an out-of-tolerance prompt mark.

It is added that in the measurement mode, the processing module has other possible ways for the first measured pressure value and the second measured pressure value;

In the second possible manner of gauge pressure measurement, in the measurement mode, although the first measured pressure value and the second measured pressure value are transmitted from the signal processing circuit board 309 to the processing module 330, the processing module 330 does not read the second measured pressure value, so that a display signal is directly generated according to the first measured pressure value, and the information displayed on the display screen 340 includes the first measured pressure value;

In a third possible gauge pressure measurement mode, in the measurement mode, the first measured pressure value and the second measured pressure value are transmitted from the signal processing circuit board 309 to the processing module 330, the processing module 330 presets a display template, the display template divides the display area of the whole display screen into a first display area which is positioned in the middle of the screen and occupies a larger area, the first display area adopts a larger font to display pressure value information, the pressure value information is used for facilitating a user to observe the current measured pressure value, and a second display area which is positioned in the lower position of the middle of the screen and occupies a smaller area, and the second display area adopts a smaller font to display pressure value information, and the pressure value is used for providing a reference when the user considers that the pressure value information of the first display area may have a problem; based on the display template, the processing module generates a display signal based on the first measured pressure value and the second measured pressure value, so that the first display area of the screen 340 displays the first measured pressure value and the second display area of the screen displays the second measured pressure value;

The gauge pressure measurement may be performed in a fourth mode, similar to one of the other modes, in which the processing module 330 directly generates a display signal according to the first measured pressure value, so that the information displayed on the display screen includes the first measured pressure value, except that the user may switch through an operation or other instruction, so that the processing module generates a display signal according to the second measured pressure value, so that the information displayed on the display screen includes the second measured pressure value without the first measured pressure value, or so that the processing module displays in a third mode, that is, the first measured pressure value and the second measured pressure value are respectively and independently displayed on the display screen;

In the fifth possible manner of gauge pressure measurement, in the measurement mode, the processing module 330 calculates an average value of the first measured pressure value and the second measured pressure value after reading the first measured pressure value and the second measured pressure value, so that the display screen 340 displays the calculated average value instead of the first measured pressure value or the second measured pressure value after generating the display signal;

As described above, in this embodiment, in the measurement mode, there may be multiple modes of using and displaying the first measured pressure value and the second measured pressure value, and in the implementation process of a specific product, one mode may be selected and only selected according to the user requirement, hardware capability, and the like; in general, the first measured pressure value is involved in the pressure value display of the measurement mode, and the second measured pressure value may or may not be involved in the pressure value display of the measurement mode.

A fast calibration mode, which may also be referred to as an on-line calibration mode, as shown in fig. 8, in which the working pressure interface 301 is in communication with the pressure source to be measured 710, and the measurement mode is distinguished in that the fast calibration pressure interface 302 is in communication with the calibration pressure source 730, the calibration pressure source 730 is configurable (i.e., the pressure of the calibration pressure source is controllable), in which the first pressure sensor 310 measures the relative pressure of the pressure source to be measured with respect to the calibration pressure source and generates a first pressure signal (analog electrical signal) indicative of the measured pressure value, the second pressure sensor 320 measures the gauge pressure of the pressure source to be measured and generates a second pressure signal (analog electrical signal) indicative of the measured pressure value, and the first pressure signal and the second pressure signal are processed by the signal processing circuit board 309, respectively, to generate a first measured pressure value (digital signal) and a second measured pressure value (digital signal) corresponding to the first pressure signal, and the first measured pressure value and the second measured pressure value are transferred from the signal processing circuit board 309 to the processing module 330;

the processing module 330 processes the first measured pressure value and the second measured pressure value and generates a display signal, and the display screen 340 obtains the display signal and displays the display signal, wherein the information displayed by the display screen includes the first measured pressure value and the second measured pressure value.

The measurement accuracy or the measurement reliability of the pressure gauge can be judged according to a first measurement pressure value (which can be read from the first pressure sensor), a second measurement pressure value (which can be read from the first pressure sensor) and a calibration pressure value (which is provided by a calibration pressure source), and specifically, a plurality of calibration judging methods are respectively suitable for different hardware configuration situations, and in the following, these schemes will be described one by way of example.

For example, in the measurement mode, as in the first gauge pressure measurement possible mode or the fifth gauge pressure measurement possible mode, before the first measured pressure value and the second measured pressure value are used for processing or calculating, it is required to determine whether the difference between the first measured pressure value and the second measured pressure value exceeds a set threshold (for example, an allowable error of the pressure gauge), and if so, the pressure gauge is indicated to have an out-of-tolerance risk;

the relationship between the first measured pressure value and the second measured pressure value is as follows in equation 2:

P _1n+ΔP_1n-P_3n＝P_2n+ΔP_2n -0 equation 2

In formula 2, P _1n represents a first measured pressure value, Δp _1n represents an actual measurement error existing in the first measured pressure value, P _2n represents a second measured pressure value, Δp _2n represents an actual measurement error existing in the second measured pressure value, and P _3n represents a pressure configured at the rapid calibration pressure interface;

In measurement mode, P _3n =0 (i.e., indicating that the fast calibration pressure interface is open to atmosphere), from equation 2, the following equation 2-1 can be derived:

ΔP ₁₀＝ΔP₂₀-P₁₀+P₂₀ equation 2-1

In the formula 2-1, Δp ₁₀ represents an actual measurement error of a first measured pressure value at the time of gauge pressure measurement, Δp ₂₀ represents an actual measurement error of a second measured pressure value at the time of gauge pressure measurement, and P ₁₀ and P ₂₀ represent the first measured pressure value and the second measured pressure value at the time of gauge pressure measurement, respectively; based on the formula 2-1, if the difference between P ₁₀ and P ₂₀ is larger and the difference exceeds a preset threshold (for example, the allowable error of the pressure gauge), since the accuracy level of the first pressure sensor is the same as that of the second pressure sensor, at least one of the two sensors has a larger possibility of exceeding the accuracy level, and the pressure gauge needs to be replaced or adjusted; if the phase difference between P ₁₀ and P ₂₀ is smaller, then either the measured errors of the first pressure sensor and the second pressure sensor are smaller, or the measured errors of the first pressure sensor and the second pressure sensor with the same direction and similar size exist.

In the rapid calibration mode, the calibration pressure source provides a calibration pressure which is not zero (i.e. atmospheric pressure), and for the second pressure sensor, the measurement mode is switched to the rapid calibration mode, and as the measured pressure source is unchanged, the measured pressure value of the measured pressure source is basically unchanged (or fluctuates within a small range), and the actual measurement error of the second measured pressure value in the rapid calibration is measured to be delta P ₂₁, and delta P ₂₀＝ΔP₂₁ is measured;

in the fast calibration mode, the following equation 2-2 can be derived from equation 2:

ΔP ₁₁＝ΔP₂₁-P₁₁+P₂₁+P₃₁ equation 2-2

In the formula 2-2, Δp ₁₁ represents an actual measurement error of the first measured pressure value in the rapid calibration, Δp ₂₁ represents an actual measurement error of the second measured pressure value in the rapid calibration, and P ₁₁、P₂₁ and P ₃₁ represent the first measured pressure value, the second measured pressure value, and the calibration pressure value in the rapid calibration, respectively; starting from equation 2-2, the following derivation can be made in conjunction with the above analysis, resulting in equation 3:

ΔP₁₁＝ΔP₂₀-P₁₁+P₂₁+P₃₁＝ΔP₁₀+(P₁₀-P₂₀)-(P₁₁-P₂₁-P₃₁) Equation 3

For the first pressure sensor, the relative pressure of the first pressure sensing surface and the second pressure sensing surface changes, and it is known that main influencing factors influencing actual measurement error results follow normal distribution or even distribution (the center point is the actual measurement error and is 0), so Δp ₁₀ and Δp ₁₁ are generally different, and have the following rules that in the normal service life of the pressure sensor, the probability of no over-tolerance is larger, the probability of over-tolerance (that is, the actual measurement error exceeds the allowable error) is smaller, in the case of over-tolerance, the single-point over-tolerance probability is larger, the probability of over-tolerance of a plurality of different points is smaller, in the case of multi-point over-tolerance, the probability of over-tolerance amplitude difference is larger, and the probability of over-tolerance is smaller; based on the calculation of the difference between (P ₁₀-P₂₀) and (P ₁₁-P₂₁-P₃₁), if the calculation result shows that the difference between Δp ₁₁ and Δp ₁₀ is large (exceeds the set threshold), at least one of Δp ₁₁ and Δp ₁₀ is likely to have a large out-of-tolerance, and the pressure gauge needs to be replaced or calibrated, if the calculation result shows that the difference between Δp ₁₁ and Δp ₁₀ is small, based on the analysis, the probability that the two points are exactly in the same out-of-tolerance direction and the out-of-tolerance amplitude is close is very small, and therefore, both Δp ₁₁ and Δp ₁₀ should be close to the center point where the measured error is 0, that is, the measured error of the pressure sensor meets the accuracy requirement of the pressure gauge.

Further, if it is desired to further reduce the likelihood of missed determinations while having a more comprehensive analysis of the pressure gauge across the span, a calibration pressure source may be used to provide a plurality of different calibration pressures during rapid calibration.

For example, the calibration pressure source provides 2 different calibration pressures, then there may be the following equations 2-3 based on equation 2:

In the formula 2-3, Δp ₂₀＝ΔP₂₁＝ΔP₂₂,P₃₀＝0,P₁₂、ΔP₁₂、P₂₂、ΔP₂₂ and P ₃₂ respectively represent a first measured pressure value and an actual measurement error thereof, a second measured pressure value and an actual measurement error thereof, and a calibration pressure value, which are different from the calibration pressure corresponding to P ₃₁ when quick calibration is performed; the calculation is performed from the formula 2-3, so that the previously described extremely small miss rate can be further reduced (if the original miss rate is about 1%, the miss rate of the formula 2-3 will be reduced to 0.01%, and so on, an appropriate combination mode can be selected according to the accuracy level requirement of the pressure gauge).

As yet another example, the first pressure sensor may have a precision sufficient to meet the pressure gauge demand, and the second pressure sensor may have a lower precision (e.g., less than the pressure gauge demand), preferably, a pressure sensor having a lower precision but higher reliability (stability) may be selected as the second pressure sensor; gauge pressure measurements may be made in a second, third or fourth manner as described above.

In this example case, in the measurement mode, the pressure measurement task for the measured pressure source is mainly carried out by the first pressure sensor, and reference may be made in particular to the aforementioned two, three and four possible gauge pressure measurement modes in the measurement mode, which are not repeated here.

In the fast calibration mode, the processing module synchronously acquires pressure information from the first pressure sensor and the second pressure sensor respectively, and generates a display signal to enable the first measured pressure value and the second measured pressure value to be displayed in the display screen simultaneously.

The pressure source to be measured should be a stable pressure source, i.e. either the pressure of the pressure source to be measured is stabilized at a certain pressure value or the pressure of the pressure source to be measured fluctuates in a small range.

Configuring a calibration pressure source, and reading a first measured pressure value P ₁₁ and a second measured pressure value P ₂₁ from the pressure gauge when the calibration pressure value provided by the calibration pressure source is stabilized at P ₃₁; this operation may be performed by a test person or by a peripheral calibration device.

The calibration pressure source is configured again, when the calibration pressure value provided by the calibration pressure source is stabilized at P ₃₂, the first measured pressure value P ₁₂ and the second measured pressure value P ₂₂,P₃₂ are read from the pressure gauge and are different from or not close to the calibration pressure P ₃₁; this operation may be performed by a test person or by a peripheral calibration device.

In the same way, the calibration pressure source can be configured for multiple times, preferably, the calibration is performed by adopting a reverse calibration method, that is, the calibration points are determined according to the indication of the first measured pressure value in the pressure gauge, generally, the number of selectable calibration points is 5-10, the first measured pressure value is the calibration point of one end point of the pressure gauge range, the first measured pressure value is the calibration point of the other end point of the pressure gauge range, and a plurality of calibration points which are uniformly distributed in the pressure gauge range as much as possible can be obtained on the basis that P _1m、P_2m and P _3m respectively correspond to the first measured pressure value, the second measured pressure value and the calibration pressure value.

Equation 4 is established as follows:

ΔP _m＝P_1m-P_2m+P_3m equation 4

Each set of the first measured pressure value, the second measured pressure value, and the calibration pressure value are substituted into equation 4, respectively, to obtain Δp ₁、ΔP₂……ΔP_m.

And selecting a maximum value and a minimum value in the delta P ₁、ΔP₂……ΔP_m, if the difference between the maximum value and the minimum value is larger than a set threshold value, judging that the first pressure sensor has larger possibility of exceeding the pressure gauge, and replacing or adjusting the pressure gauge is needed, and if the difference between the maximum value and the minimum value is smaller than or equal to the set threshold value, judging that the first pressure sensor is in a normal state, wherein the set threshold value can be an allowable error of the pressure gauge.

Again, the measurement pattern is similar to the first two examples and will not be repeated here.

In the rapid calibration mode, the processing module synchronously acquires pressure information from the first pressure sensor and the second pressure sensor respectively, generates display signals, enables a first measurement pressure value and a second measurement pressure value to be displayed in the display screen simultaneously, enables the measured pressure source to be a stable pressure source, configures the calibration pressure source twice, respectively obtains the calibration pressure source, records a corresponding calibration pressure value P ₃₁ when the first measurement pressure value is P ₁₁, simultaneously pays attention to a second measurement pressure value P ₂₁, records a corresponding calibration pressure value P ₃₂ when the first measurement pressure value is P ₁₂, and pays attention to the second measurement pressure value P ₂₂ simultaneously;

in two configuration changes: the measured change value of the first measured pressure value is (P ₁₁-P₁₂); the relative pressure reference change value loaded on the first pressure sensor is (P ₃₂-P₃₁)+(P₂₁-P₂₂).

Theoretically, if the first pressure sensor is sufficiently accurate, the measured change value and the reference change value are equal, i.e., (P ₁₁-P₁₂)＝(P₃₂-P₃₁)+(P₂₁-P₂₂);

In the actual process, the measured change value and the reference change value are unequal because of errors of the first pressure sensor;

further, if the difference between the actually measured change value and the reference change value is larger than the allowable error of the pressure gauge, it indicates that at least in the section of pressure change interval, the first measured pressure value is not changed according to the reference change value, and the difference amplitude exceeds the allowable error, and it is determined that the pressure gauge has an out-of-tolerance problem and needs to be replaced or calibrated; if the difference between the actually measured change value and the reference change value is smaller than or equal to the allowable error of the pressure gauge, judging that the accuracy of the pressure gauge meets the requirement.

Considering that the measured pressure source is a stable pressure source, if the quick calibration time is shorter, the pressure of the measured pressure source should be stable at a certain pressure value and not changed; as described in the previous example, for the second measured pressure value, which is mainly of interest and not recorded, if the second measured pressure value is unchanged during the fast calibration process, i.e. P ₂₁＝P₂₂＝P_2m, then theoretically the only change of the calibration pressure affecting the relative pressure change of the first measured pressure value, i.e. the relative pressure reference change value loaded on the first pressure sensor, is (P ₃₂-P₃₁), this improved concept has a great improved benefit in the face of a more conventional pressure gauge hardware configuration and calibration equipment.

As a further example, the present embodiment is modified by analyzing the present embodiment based on the possible examples, and in the process of processing the related data of the first measured pressure value and the second measured pressure value, for the purpose of rapid calibration, the first measured pressure value and the second measured pressure value often appear as a difference value between them, and the modification is made on the basis of this as follows:

According to the first improvement scheme, the pressure gauge is provided with a key, the key is in signal connection with the processing module, an operator can set the pressure gauge through the key, the processing module is switched between a measurement mode and a quick calibration mode based on a key instruction, the measurement mode is not repeated here as in the above specific embodiment, in the quick calibration mode, the processing module calculates the difference value between the second measurement pressure value and the first measurement pressure value after synchronously obtaining the first measurement pressure value and the second measurement pressure value, a display signal is generated according to the calculation result, and the display signal is obtained and displayed by the display screen, so that the calculation result (namely the difference value between the second measurement pressure value and the first measurement pressure value) is displayed in the display screen.

According to the second improvement scheme, the display screen is a touch screen, a user can set the pressure gauge through the touch screen, the processing module is switched between a measurement mode and a quick calibration mode based on a touch instruction of the touch screen, and in the quick calibration mode, the processing module calculates a difference value between a second measurement pressure value and a first measurement pressure value and generates a display signal, so that the calculation result (namely, the difference value between the second measurement pressure value and the first measurement pressure value) is displayed in the display screen.

The third improvement, and the first improvement and the second improvement are different, the processing module is configured to switch between the measurement mode and the quick calibration mode according to the difference between the first measurement pressure value and the second measurement pressure value, the processing module acquires the first measurement pressure value and the second measurement pressure value from the first pressure sensor and the second pressure sensor synchronously, before generating the display signal, the processing module calculates the difference between the first measurement pressure value and the second measurement pressure value, if the difference between the first measurement pressure value and the second measurement pressure value is greater than the set threshold, the processing module enters the quick calibration mode to operate, the processing module displays the difference between the second measurement pressure value and the first measurement pressure value in the display screen based on the difference between the second measurement pressure value and the first measurement pressure value, if the difference between the first measurement pressure value and the second measurement pressure value is less than or equal to the set threshold, the processing module enters the measurement mode to operate, and the specific operation mode in the measurement mode is not repeated here;

in the third improvement, the set threshold is a range value, and the center of the range value is not necessarily zero, that is, under the condition that the first measured pressure value is sufficiently accurate, a fixed deviation is allowed to exist between the first measured pressure value and the second measured pressure value, because the fixed deviation is eliminated in the difference value calculation, the final judgment is not affected;

One of the technical effects of the third improvement is that when a user faces the pressure gauge, the accuracy condition of the pressure gauge can be judged according to the information content displayed by the pressure gauge and the external working environment, and in the non-rapid calibration process (for example, when the pressure gauge is in a measurement mode), if the pressure gauge is displayed in a differential mode (namely, automatically switched to the rapid calibration mode), the pressure gauge can have a problem, and the pressure gauge needs to be calibrated, otherwise, the pressure gauge can automatically enter the rapid calibration mode without operation when the rapid calibration is performed.

As another example, the present embodiment is improved, and analysis is performed based on each possible example, and in the process of processing the second measured pressure value, for the purpose of quick calibration, the main concern is about the fluctuation condition of the second measured pressure value, that is, whether the pressure value of the measured pressure source changes in the quick calibration process, and on the basis, the following scheme is provided:

According to the first improvement scheme, a key is arranged on the pressure gauge and is in signal connection with the processing module, so that an operator can set the pressure gauge through the key, when the operator issues an instruction for recording a reference second measured pressure value through the key, the processing module receives the key instruction and records a current second measured pressure value corresponding to the key instruction as a reference value, in a quick calibration mode, when the processing module acquires the second measured pressure value, the processing module calculates the difference between the current second measured pressure value and the reference second measured pressure value and generates a display signal according to the difference, the information displayed in the display screen comprises the difference between the current second measured pressure value and the reference second measured pressure value, and the fluctuation condition of a measured pressure source can be judged more conveniently based on the display information;

In the second improvement scheme, the display screen is a touch screen, in the first improvement scheme, the touch screen simultaneously takes the functions of keys and the display screen into consideration, and other processes are similar to the first improvement scheme and are not repeated here;

In the fast calibration mode, the processing module periodically acquires the second measured pressure values from the second pressure sensor, and when two or more second measured pressure values are continuously maintained (it is to be noted that the maintenance is not absolute, but fluctuates within a required accuracy range with respect to the accuracy of the second measured pressure values), the processing module records the second measured pressure value in a steady pressure state as a reference second measured pressure value, and subsequently, when the processing module acquires the second measured pressure values, calculates a difference between the current second measured pressure value and the reference second measured pressure value, and generates a display signal based on the difference, so that the information displayed in the display screen includes the difference between the current second measured pressure value and the reference second measured pressure value.

As another example, in a case where the present embodiment is modified, it is desirable to store the rapid calibration data with the pressure gauge or the pressure gauge may directly generate the rapid calibration determination result, so that the calibration pressure value needs to be introduced into the pressure gauge, and on the basis of this, there are the following schemes:

According to the first improvement scheme, a press key is arranged on the pressure gauge and is in signal connection with the processing module, and/or the display screen is a touch screen, and through the direct input device, a user can manually input a calibration pressure value to the processing module of the pressure gauge;

The second improvement scheme is that the pressure gauge is provided with a communication module, wherein the communication module can be a wired communication interface or a wireless communication module (such as a Bluetooth module), the processing module is in signal connection with the communication module, the calibration pressure acquisition device establishes a data channel through the communication module and the processing module, and the calibration pressure acquisition device is used for measuring the pressure of a calibration pressure source (the supplementary explanation is that if the calibration pressure is from the pressure acquisition device, the calibration pressure acquisition device can be integrated with the calibration pressure source); in the rapid calibration mode, the processing module obtains a calibration pressure value through the communication module.

As another example, according to the foregoing pressure gauge scheme of the present specific embodiment, as shown in fig. 9, the present example provides a rapid calibration method for such a pressure gauge, including the following steps:

the preparation process, the working pressure interface of the pressure meter to be calibrated is communicated with the pressure source to be calibrated (the working pressure interface is kept to be communicated with the pressure source to be calibrated), the quick calibration pressure interface of the pressure meter is communicated with the calibration pressure source, and therefore the pressure meter to be calibrated is arranged in a quick calibration mode (if the pressure source to be calibrated has different data processing modes in a measurement mode and a quick calibration mode, and a key and/or a touch screen for manually switching different working modes are arranged, the setting is also needed manually, and therefore a processing module of the pressure meter to be calibrated also enters the quick calibration mode);

setting two or more target pressure values based on the purpose of calibration (such as the need of carrying out complete full-range calibration on the calibrated pressure gauge, or the need of paying attention to only a limited number of key points, or the need of quickly checking the basic state of the calibrated pressure gauge), wherein the target pressure value can be the calibration pressure or the first measured pressure value of the first pressure sensor;

For ease of description, two target pressure values are chosen in this example, a calibration pressure value of zero (i.e., atmospheric pressure) and a first measured pressure value of zero, respectively.

In this embodiment, when the first measured pressure value is zero, the calibration pressure to be loaded theoretically corresponds to the pressure of the measured pressure source, which is higher than the case where the calibration pressure is atmospheric (i.e., the gauge pressure calibration pressure value is zero), so that the target pressure with the first measured pressure value being zero is loaded first, and the target pressure with the calibration pressure value being zero is loaded second.

The calibration pressure source is configured according to the first measured pressure value indicated by the calibrated pressure, so that the first measured pressure value reaches and stabilizes at zero, and the first measured pressure value P ₁₁ and the second measured pressure value P ₂₁ and the calibration pressure value P ₃₁ are synchronously acquired in a pressure stabilizing state.

And (3) starting to release pressure by communicating the calibration pressure source with the atmosphere, configuring the calibration pressure source according to the calibration pressure value, enabling the calibration pressure value to reach and be stabilized at zero after the pressure release is completed, and synchronously acquiring a first measurement pressure value P ₁₂ and a second measurement pressure value P ₂₂ and a calibration pressure value P ₃₂ in a pressure stabilizing state.

And judging the deviation condition of the calibrated pressure gauge and the first pressure sensor thereof according to the two groups of the first measured pressure value P ₁₁ and the second measured pressure value P ₂₁, the calibrated pressure value P ₃₁, the first measured pressure value P ₁₂, the second measured pressure value P ₂₂ and the calibrated pressure value P ₃₂.

Specific processing and judgment methods are as in the foregoing examples and will not be repeated here.

If the calculated deviation result reaches or exceeds twice of the allowable error of the calibrated pressure gauge, the calibrated pressure gauge has the problem of out-of-tolerance and needs to be replaced or calibrated;

If the calculated deviation result is smaller than or equal to the allowable error of the calibrated pressure gauge, the deviation of the calibrated pressure gauge is in a reasonable range, and the calibrated pressure gauge can be normally metered for use;

If the calculated deviation exceeds the allowable error of the calibrated pressure gauge, but is less than twice the allowable error of the calibrated pressure gauge, the calibration data needs to be supplemented for judgment.

The scheme for supplementing the calibration data comprises the following steps:

Selecting one or more calibration pressures between P ₃₁ and P ₃₂ as target pressure values, or selecting one calibration pressure between P ₁₁ and P ₁₂ as target pressure values, performing specific processing and determination as in the foregoing examples based on the supplemental calibration data;

Likewise, if at least one of the deviation results obtained according to the supplementary calibration data is up to or exceeds twice the allowable error of the calibrated pressure gauge, judging that the calibrated pressure gauge has an out-of-tolerance problem; if all deviation results obtained according to the supplementary calibration data are smaller than or equal to the allowable error of the calibrated pressure gauge, judging that the calibrated pressure gauge is in a reasonable range; if the deviation result obtained according to the supplementary calibration data exceeds the allowable error of the calibrated pressure gauge but is less than twice the allowable error of the calibrated pressure gauge, the supplementary calibration data is further supplemented to judge;

The supplementary calibration data should be selected to be distributed as uniformly as possible within the range of the calibrated pressure gauge, and at the same time, when the first measured pressure value is used as the target pressure value object, the point to be estimated and read is avoided as much as possible.

As another example, the present embodiment is modified such that the first measured pressure value, the second measured pressure value, and the calibration pressure value, which correspond to each other, are used as one set of calibration basic data, and if three or more sets of calibration basic data exist, a change curve may be fitted.

According to the first fitting scheme, deviation calculated values delta P _m corresponding to each group of calibration basic data can be obtained according to delta P _m＝P_1m-P_2m+P_3m (formula 4), the deviation calculated values delta P _m are taken as y values, the calibration pressure value P _3m or the sequence number (such as 1,2,3 and the like) of the calibration basic data are taken as x values, a horizontal linear change curve y=n is fitted, the fitting method can be a least square method, and if the number of groups of the calibration basic data is enough (such as more than 6 groups), the mode in the deviation calculated values delta P _m can be selected as n;

And calculating the distance between each delta P _m and y=n, and if the distance is greater than or equal to the allowable error of the pressure gauge, judging that the pressure gauge has the out-of-tolerance problem, otherwise, indicating that the measurement accuracy of the pressure gauge meets the requirement.

A fitting scheme II, a function f (x ₁-x₂)＝x₁-x₂ +a), wherein a first measured pressure value is taken as f (x ₁-x₂), a second measured pressure value is taken as x ₁, a calibration pressure value is taken as x ₂, each group of calibration basic data is fitted to the function according to a least square method or other fitting methods in the prior art to obtain a value, and it is to be noted that if a measured pressure source is stable and unchanged in a rapid calibration process, that is, P _2m is equal to a certain pressure value, the function can be simplified to f (x ₂)＝b-x₂;

And calculating the distance between each (P _2m-P_3m,P_1m) and f (x ₁-x₂) or calculating the distance between each (P _3m,P_1m) and f (x ₂), and if the distance is greater than or equal to the allowable error of the pressure gauge, judging that the pressure gauge has the out-of-tolerance problem, otherwise, indicating that the measurement accuracy of the pressure gauge meets the requirement.

Detailed description of the preferred embodiments

As shown in fig. 10 and 11, the pressure gauge includes a housing, a display 440 provided on the front surface of the housing, a working pressure port 401 provided on the bottom surface of the housing, and a quick calibration pressure port 402 provided on the lower portion of the back surface of the housing.

The pressure sensor 410 is fixedly arranged in the shell and comprises a first pressure sensing surface 411 and a second pressure sensing surface 412, the first pressure sensing surface 411 is communicated with the working pressure interface 401, the second pressure sensing surface 412 is communicated with the rapid calibration pressure interface 402, and the pressure sensor 410 measures the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generates a pressure signal (electric signal analog quantity) indicating the relative pressure value.

The pressure sensor signal connection comprises a processing module 430, an analog-to-digital conversion circuit 431 (AD) is arranged on the processing module, the analog-to-digital conversion circuit 431 is in signal connection with the pressure sensor 410, so that a pressure signal (an electric signal analog quantity) is converted into a represented measured pressure value (a digital quantity), based on the measured pressure value, the processing module 430 generates a display signal, the processing module 430 is in signal connection with a display screen 440, and the display signal is transmitted from the processing module 430 to the display screen 440, so that the display screen displays the measured pressure value.

When the pressure gauge is put into use, taking gauge pressure measurement as an example, when the gauge pressure of the measured pressure source needs to be measured, the working pressure interface 401 is communicated with the measured pressure source 710, and meanwhile, the rapid calibration pressure interface 402 is kept in an open and atmospheric state, and at the moment, the pressure value displayed by the pressure gauge (namely, the measured pressure value of the pressure sensor) is the gauge pressure value of the measured pressure source.

When the pressure gauge is to be calibrated, if the pressure source 710 is a continuous stable pressure source, it can be calibrated without removing the pressure gauge, and at this time, the continuous communication between the working pressure port 401 and the pressure source 710 is maintained, and the quick calibration pressure port 402 is communicated with the prepared calibration pressure source 730, which is a configurable pressure source (which can provide a controllable calibration pressure different from the atmospheric pressure).

The gauge pressure gauge of the prior art has only one working pressure interface and no quick calibration pressure interface, the gauge pressure gauge of the prior art generates a measured pressure value according to the relative pressure between the measured working pressure and the atmosphere introduced by the working pressure interface, obviously, in order to calibrate the gauge pressure gauge of the prior art, either a standard is used for directly measuring the working pressure (which is the most common calibration method in the prior art), or different pressures are loaded on the working pressure interface, however, the pressure of the measured pressure source is usually stable and unchanged, and the pressure of the measured pressure source is not possible to be adjusted for the purpose of calibration, so that a scheme for providing different pressures for the gauge pressure gauge to realize calibration cannot be realized in the prior art.

The scheme is obviously different from the prior art, the pressure sensor has the advantages that the pressure sensor is provided with a working pressure interface and is also provided with a quick calibration pressure interface, the quick calibration pressure interface is communicated with the atmosphere in a measurement mode, the gauge pressure measurement function can be realized, the quick calibration pressure interface is communicated with a calibration pressure source in the quick calibration mode, at the moment, the pressure of the measured pressure source is not directly changed, but the calibration pressure of the calibration pressure source is changed, so that the relative pressure measured by the pressure sensor is actually changed, the pressure of the measured pressure source can be equivalent to the change of the pressure of the measured pressure source, meanwhile, the pressure stability of the measured pressure source is utilized, and the calibration pressure value of the calibration pressure source can be read, so that the standard value of the relative pressure change can be read on the basis of not reading the standard value of the relative pressure, and the calibration is realized.

It should be noted that, if the stability of the measured pressure source is higher (for example, the fluctuation of the measured pressure source is smaller than the allowable error of the pressure gauge), or the calibration requirement of the pressure gauge is lower (for example, only the stabilized pressure precision of the measured pressure source needs to be calibrated, and the design precision of the pressure gauge does not need to be considered), the calculation result of the scheme has higher effectiveness, the measurement deviation situation of the pressure gauge can be quantitatively evaluated, if the stability of the measured pressure source is lower (for example, the fluctuation of the measured pressure source is equal to or slightly larger than the allowable error of the pressure gauge), or the calibration requirement of the pressure gauge is higher (for example, the design measurement precision of the pressure gauge is higher than the stabilized pressure precision of the measured pressure source, and the calibration is expected to be calibrated according to the design measurement precision of the pressure gauge), the calculation result of the scheme can be used for judging the reliability of the pressure gauge, for example, the calculation result of the scheme can evaluate whether the pressure gauge has obvious overdifference or not overdifference, but cannot provide highly effective quantized data.

Also for example, based on the pressure gauge of the present embodiment, a quick calibration method includes the following steps:

in the front process, the calibrated pressure gauge (the pressure gauge in the scheme adopting the specific embodiment) is in a measurement mode, the working pressure interface is communicated with a measured pressure source, the rapid calibration pressure interface is communicated with the atmosphere,

The preparation process, the pressure meter to be calibrated is switched to a quick calibration mode, which comprises the steps of keeping the continuous communication between a working pressure interface and a pressure source to be calibrated unchanged, communicating the quick calibration pressure interface with the calibration pressure source, setting two or more target pressures, wherein the target pressures comprise three, setting the measurement pressure value of the pressure meter to be P ₁₀ in the measurement mode, respectively setting the measurement pressure value of the pressure meter to be 0, setting the measurement pressure value of the pressure meter to be near P ₁₀/2, setting the calibration pressure value of the calibration pressure source to be 0 (namely atmospheric pressure),

Starting calibration operation, configuring a calibration pressure source according to a measured pressure value of a pressure gauge, enabling the pressure gauge to be stable at 0 (namely, the measured pressure value), recording a measured pressure value P ₁₁ =0 of the pressure gauge, and recording a calibration pressure value (namely, a standard value of calibration pressure provided by the calibration pressure source) P ₃₁ at the moment;

Continuing the calibration operation, performing depressurization configuration on the calibration pressure source, stopping depressurization when the measured pressure value of the pressure gauge is close to P ₁₀/2, and recording the measured pressure value P ₁₂ of the pressure gauge and the corresponding calibration pressure value P ₃₂ when the pressure is stable;

Continuing the calibration operation, performing depressurization configuration on the calibration pressure source to reduce the pressure of the calibration pressure source until reaching and stabilizing at the atmospheric pressure, recording the pressure value measured by the pressure gauge P ₁₃ and the corresponding calibration pressure value P ₃₃ =0 when the pressure is stabilized,

And carrying out combination calculation on three groups of measured pressure values and calibration pressure values obtained by the calibration operation, wherein the combination calculation comprises the following formula 5:

Judging according to the calculation result of the above formula 5, if any one of the Δp _1/3、ΔP_1/2 and Δp _2/3 exceeds a set threshold, determining that the accuracy of the calibrated pressure gauge has deviation which does not meet the metering requirement, and if both Δp _1/3、ΔP_1/2 and Δp _2/3 are smaller than or equal to the set threshold, determining that the accuracy of the calibrated pressure gauge meets the metering requirement;

The above-mentioned set threshold value is selected in P _Δ＝βP_Δ, where P _Δ represents the set threshold value (pressure value), βe [1,2], which can be valued according to the specific calibration purpose, and P _Δ represents the allowable error, which can be the allowable error of the calibrated pressure gauge or the allowable fluctuation range of the pressure of the measured pressure source, according to the specific calibration purpose.

In another example, the pressure gauge and the rapid calibration method of the foregoing example are improved in a combined manner, the pressure gauge further includes a communication module, the communication module is in signal connection with the processing module, and when the rapid calibration is performed, the communication module is in signal connection with an external standard pressure measurement device for measuring a pressure value of the calibration pressure source, so that the processing module can obtain the calibration pressure value from the external standard pressure measurement device in real time through the communication module;

During the rapid calibration process, the processing module is configured to:

periodically acquiring a measured pressure value from a pressure sensor, judging the measured pressure value, recording the stable measured pressure value when the measured pressure value is stable at a certain pressure value, and acquiring a current calibration pressure value from a communication module and recording by taking the stable measured pressure value as a trigger; the processing module is provided with a memory chip (RAM/ROM or other components with data storage function in the prior art), and the processing module establishes a corresponding relation between the recorded measured pressure value and the calibration pressure value and stores the corresponding relation;

Further, a stable time threshold may be set, where the trigger points for acquiring and recording the measured pressure value are expanded, when the measured pressure value is switched from the conversion state to the stable state, the recording of the stable measured pressure value is triggered, the processing module records the occurrence time of the measured pressure value and starts timing at the same time, if the measured pressure value is continuously stabilized at a certain pressure value during timing, when the timing time reaches the stable time threshold, the recording of the stable measured pressure value is triggered again, and timing is restarted, and if the measured pressure value is changed during timing, the timing is stopped;

When a stable measured pressure value is recorded, the processing module is used for checking whether the measured pressure value and the calibration pressure value are stored in the calibration operation at the same time, if one or more groups of previously stored measured pressure values and calibration pressure values exist, according to the process in the calibration method, combining and calculating the current group of measured pressure values and calibration pressure values with each group of previously stored measured pressure values and calibration pressure values to obtain delta P _m/n (m and n represent two groups of data), comparing the calculation result with a preset pressure threshold value, and prompting through a display screen when the condition that the accuracy of the calibrated pressure meter is not in accordance with the deviation of the metering requirement is judged;

the preset pressure threshold can be set by itself, and by default, the preset pressure threshold is equal to the allowable error of the pressure gauge.

Detailed description of the preferred embodiments

The pressure gauge for automatically and quickly calibrating the pressure gauge of the first embodiment, the second embodiment and the third embodiment comprises a pressure quick calibration system, wherein the calibration object of the quick calibration system is the pressure gauge of each embodiment, the description of each embodiment is described based on the information of the calibration object, and the description of the repetitive content of the embodiment is omitted unless the distinction or the special description is needed.

As illustrated in fig. 12, the pressure calibrator includes a standard pressure module 610, a measured pressure value acquisition module 620, and a calibration information processing module 630.

The standard pressure module 610 is used for measuring the calibration pressure, and the accuracy of the standard pressure module is higher than that of the calibrated pressure gauge so as to meet the calibration requirement, and the standard pressure module 610 is in signal connection with the calibration information processing module 630.

The measured pressure value obtaining module 620 is configured to obtain a measured pressure value from the calibrated pressure meter, where the measured pressure value obtaining module 620 is in signal connection with the calibration information processing module 630, and the measured pressure value obtaining module may be one or a combination of several of the following according to different hardware configurations of the calibrated pressure meter:

The calibrated pressure gauge is provided with a first wired communication interface which is in signal connection with a processing module of the calibrated pressure gauge, the measured pressure value (comprising a first measured pressure value and a second measured pressure value) of the calibrated pressure gauge can be read through the first wired communication interface, and the second wired communication interface 621 which is matched with a communication protocol is arranged on the pressure calibrator and is used as a measured pressure value acquisition module, the second wired communication interface is in signal connection with the calibration information processing module, and the second wired communication interface is in wired connection with the first wired communication interface during quick calibration;

The pressure gauge to be calibrated is provided with a first wireless communication module which is in signal connection with a processing module of the pressure gauge to be calibrated, the pressure value of the pressure gauge to be calibrated can be read from the pressure gauge to be calibrated through the first wireless communication module, based on the pressure gauge, a second wireless communication module 622 (such as a Bluetooth module) which can be adaptively connected with the first wireless communication module is arranged on the pressure gauge and is used as a measured pressure value acquisition module, the second wireless communication module is in signal connection with a calibration information processing module, and the second wireless communication module is adaptively connected with the first wireless communication module during rapid calibration;

The calibrated pressure gauge is provided with a wired interface or a wireless communication module and is connected to a certain pressure information measurement network, and based on the wired interface or the wireless communication module, the communication module which can be connected to the measurement network is arranged on the pressure calibrator;

The calibrated pressure gauge outputs a measured pressure value through an image on a display screen, based on the measured pressure value, a camera 623 and an image information processing module 624 are arranged on pressure verification, the image information processing module 624 is respectively connected with the camera 623 and the calibration information processing module 630 in a signal mode, when the pressure gauge is calibrated rapidly, the camera is used for collecting the image on the display screen and transmitting the image information to the image information processing module, and the image information processing module is used for processing the image information to obtain corresponding measured pressure value information and transmitting the information to the calibration information processing module.

The calibration information processing module judges the type of the calibrated pressure gauge according to the setting information and the number (one or two) of the measurement pressure values which can be obtained at the same time:

If the pressure gauge to be calibrated is specified as the pressure gauge described in the second embodiment or the third embodiment in the setting information, the setting information is executed according to the setting information, and the setting information may be derived from an input module 650 of the pressure gauge, for example, a touch display screen; further, the setting information may directly set the type of the obtained pressure information, for example, a first measured pressure value, a second measured pressure value, a difference value of the measured pressure values, and the like;

If no setting information is input, the calibration information processing module judges the type of the calibrated pressure gauge according to the number of the measurement pressure values which can be obtained at the same time, if the number of the measurement pressure values which can be obtained at the same time is two, namely, the calibrated pressure gauge belongs to the pressure gauge described in the second embodiment, and if the number of the measurement pressure values which can be obtained at the same time is one, namely, the calibrated pressure gauge belongs to the pressure gauge described in the third embodiment.

The calibration information processing module determines the deviation of the calibrated pressure gauge according to the calibration pressure value and the measured pressure value (the first measured pressure value and the second measured pressure value) after determining the type of the calibrated pressure gauge and the acquired pressure information type, and the specific determination process can refer to the rapid calibration determination process in the first embodiment, the second embodiment and the third embodiment, which are not repeated here.

Additionally, when the pressure gauge to be calibrated is calibrated quickly, the pressure gauge further comprises a configurable pressure generating device 640, which is external (i.e., not contained in the pressure gauge) or internal (i.e., disposed in the pressure gauge);

an external configurable pressure generating device, such as a pneumatic hand pump, or other controllable pressure generating device, wherein a pressure output end of the pressure generating device is provided with a pressure interface for placing a measuring end of a standard pressure module;

The built-in pressure generating module 640 is different from the external pressure generating device in that the built-in pressure generating module 640 is respectively connected with the standard pressure module 610 and the calibration information processing module 630 in a signal manner; in one case, the calibration information processing module transmits a target pressure value to the built-in pressure generating module, and the built-in pressure generating module periodically acquires a calibration pressure value from the standard pressure module, and performs pressure generation and control according to the calibration pressure value and the target pressure value, so that the calibration pressure value acquired from the standard pressure module reaches and is stabilized at the target pressure value; in another case, the calibration information processing module periodically transmits the target pressure value and the calibrated pressure value to the built-in pressure generating module, and the built-in pressure generating module performs pressure generation and control according to the target pressure value and the calibrated pressure value, so that the calibrated pressure value reaches and stabilizes at the target pressure value.

Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations should and are intended to be comprehended within the scope of the present application.

Claims

1. A pressure gauge comprises a first pressure sensor, a second pressure sensor, a working pressure interface and a quick calibration pressure interface;

The first pressure sensor and the second pressure sensor respectively comprise a first pressure sensing surface and a second pressure sensing surface, and the pressure sensors measure the relative pressure of the first pressure sensing surface and the second pressure sensing surface and generate pressure signals;

The first pressure sensing surface of the first pressure sensor and the first pressure sensing surface of the second pressure sensor are both communicated with the working pressure interface, the second pressure sensing surface of the first pressure sensor is communicated with the rapid calibration pressure interface, and the second pressure sensing surface of the second pressure sensor is communicated with the atmosphere;

In a measurement mode, the working pressure interface is communicated with a measured pressure source, the rapid calibration pressure interface is communicated with the atmosphere, and the first pressure sensor and the second pressure sensor respectively measure the measured pressure and generate pressure signals;

In the quick calibration mode, the working pressure interface is communicated with the measured pressure source, the quick calibration pressure interface is communicated with the calibration pressure source, the first pressure sensor measures the relative pressure of the measured pressure source and the calibration pressure source and generates a pressure signal, and the second pressure sensor measures the measured pressure and generates a pressure signal.

2. The pressure gauge of claim 1, wherein the measurement bias of the pressure gauge is determined based on the measured value of the first pressure sensor, the measured value of the second pressure sensor, and the calibrated pressure value of the calibrated pressure source.

3. The pressure gauge of claim 1, further comprising a processing module and an information output module, wherein in the fast calibration mode, the processing module records a measured value of the second pressure sensor at an earlier time, and when the processing module obtains the measured value of the second pressure sensor at a current time, the processing module calculates a difference between the measured value of the second pressure sensor at the current time and the measured value of the second pressure sensor at the earlier time, and the information output module outputs a calculation result of the processing module, wherein the earlier time and the current time are different times of the same fast calibration operation.

4. The pressure gauge of claim 1, further comprising a processing module and an information input module, wherein in the fast calibration mode, the processing module synchronously obtains the measured value of the first pressure sensor and the measured value of the second pressure sensor in a steady state, and obtains and processes the calibrated pressure value through the information input module, wherein the steady state is that the measured value of the first pressure sensor is stable or the calibrated pressure value is stable.

5. The pressure gauge of claim 1, wherein in the measurement mode, the measured pressure value is generated based on pressure signals of the first pressure sensor and the second pressure sensor.

6. The pressure gauge of claim 1, wherein the operating pressure port is in continuous communication with the pressure source being measured when switching between the measurement mode and the quick calibration mode.

7. A method of rapid calibration of a pressure gauge based on the pressure gauge of any one of claims 1-6, comprising

Setting the pressure gauge in a fast calibration mode;

setting two or more target pressure values;

8. The rapid calibration method of claim 7, wherein the target pressure value is set to zero, and the calibration pressure source is controlled based on the measured value of the first pressure sensor and the target pressure value so that the measured value of the first pressure sensor is stabilized to zero.

9. The method according to claim 7 or 8, wherein when the calibration pressure value is not lower than the atmospheric pressure, the calibration pressure source is controlled so that the calibration pressure value or the first pressure sensor measurement value is stabilized at the target pressure value having the higher calibration pressure and then stabilized at the target pressure value having the lower calibration pressure.

10. The method of claim 9, wherein the calibration pressure source is controlled to stabilize the calibration pressure value at atmospheric pressure.

11. The method according to claim 7, wherein the deviation change condition of the first pressure sensor measurement value is determined based on two sets of calibration pressure values, the first pressure sensor measurement value, and the second pressure sensor measurement value, which are different in target pressure value.

12. The rapid calibration method of pressure gauge according to claim 7, wherein the calibration pressure source is controlled at least three times or more to stabilize the calibration pressure value or the first pressure sensor measurement value at three or more target pressure values, three or more sets of the calibration pressure value, the first pressure sensor measurement value and the second pressure sensor measurement value are obtained, a linear variation curve of the first pressure sensor measurement value with the calibration pressure value is fitted accordingly, and the measurement deviation of the pressure gauge is judged according to the distance between the linear variation curve and the first pressure sensor measurement value.

13. A pressure calibration device for rapidly calibrating the pressure gauge of any one of claims 1-6, comprising a standard pressure module, a measured pressure value acquisition module and a calibration information processing module, wherein the standard pressure module and the measured pressure value acquisition module are respectively connected with the calibration information processing module;

the standard pressure module is used for measuring a calibration pressure value;

the measured pressure value acquisition module is used for acquiring the measured pressure value from the calibrated pressure gauge;

and the calibration information processing module is configured to quickly calibrate the calibrated pressure gauge according to the calibration pressure value and the measured pressure value.

14. The pressure calibration device of claim 13, further comprising a built-in pressure generating module in signal communication with the standard pressure module and the calibration information processing module, respectively, the built-in pressure generating module configured to generate pressure based on the target pressure value and one of the calibrated pressure value or the measured pressure value.