CN112945463A - Zero-pressure automatic calibration device and method for pressure transmitter - Google Patents
Zero-pressure automatic calibration device and method for pressure transmitter Download PDFInfo
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- CN112945463A CN112945463A CN202110427839.3A CN202110427839A CN112945463A CN 112945463 A CN112945463 A CN 112945463A CN 202110427839 A CN202110427839 A CN 202110427839A CN 112945463 A CN112945463 A CN 112945463A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000012886 linear function Methods 0.000 claims description 24
- 238000010586 diagram Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 4
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- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
Abstract
The invention discloses a zero-pressure automatic calibration device and a method for a pressure transmitter, which comprises the following equipment: a first measured medium as a measured pressure object; a pressure sensitive device; a gas path switch which can be controlled by software to communicate the measured closed gas path with the atmosphere; the PCBA board is used for reading the pressure sensitive device signals and outputting the converted signals; the PCBA board is electrically connected with the pressure sensitive device, one end of the pressure sensitive device is connected with a first measured medium through the first air path connecting port to form a closed air path, the other end of the pressure sensitive device is communicated with the atmosphere through the second air path connecting port, the first air path connecting port is further connected with the air path switch communicated with the atmosphere, when the control air path switch is opened, the closed air path is communicated with the atmosphere, and a state that the differential pressure between the first air path connecting port and the second air path connecting port is zero is achieved. The invention improves the detection precision.
Description
Technical Field
The invention relates to the technical field of pressure calibration, in particular to a zero-pressure automatic calibration method of a pressure transmitter.
Background
The pressure sensor is limited to the physical characteristics, and the output signal can be deviated along with the increase of the service time of the product, and the deviation can cause the reduction of the measurement accuracy.
The pressure transmitter in the market only has a sensor signal reading function and a signal conversion function, and has no effect on zero-pressure deviation of the sensor, so that how to design a pressure transmitter capable of performing pressure calibration under adjustment under the condition of deviation is particularly important for improving detection precision.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a zero-pressure automatic calibration method of the pressure transmitter, which creates the condition that the differential pressure of the pressure transmitter is zero in the set time, performs zero-pressure calibration, ensures that the transmitter can output signals extremely close to an ideal value and achieves extremely high measurement precision.
In order to achieve the above purpose, the invention provides a zero-pressure automatic calibration device for a pressure transmitter, which comprises the following devices:
a first measured medium as a measured pressure object;
a pressure sensitive device;
a gas path switch which can be controlled by software to communicate the measured closed gas path with the atmosphere;
the PCBA board is used for reading the pressure sensitive device signals and outputting the converted signals;
the PCBA board is electrically connected with the pressure sensitive device, one end of the pressure sensitive device is connected with a first measured medium through the first air path connecting port to form a closed air path, the other end of the pressure sensitive device is communicated with the atmosphere through the second air path connecting port, the first air path connecting port is further connected with the air path switch communicated with the atmosphere, when the control air path switch is opened, the closed air path is communicated with the atmosphere, and a state that the differential pressure between the first air path connecting port and the second air path connecting port is zero is achieved.
Furthermore, a second measured medium is connected to the second gas path connecting port to form a closed gas path, and a second electromagnetic valve communicated with the atmosphere is connected to the second gas path connecting port.
Further, the air path switch is a first electromagnetic valve.
Further, the pressure sensitive device is a pressure sensor.
Further, still be connected with the wifi transmitter on the PCBA board.
The invention also discloses a zero-pressure automatic calibration method of the pressure transmitter, which comprises the following steps that a sensor manufacturer modulates the pressure sensitive device into a linear correlation diagram of pressure and signal, so that the corresponding pressure of a measured medium can be calculated according to a linear function when reading the electric signal of the pressure sensitive device, and the method comprises the following specific steps:
s1, acquiring a linear function y which is formed by factory calibration of the sensitive device and is kx + b, wherein the electric signal of the pressure sensitive device is defined as x, and the pressure value is defined as y;
s2, opening the corresponding air circuit switch, inflating with an electromagnetic valve to create a condition of zero differential pressure (i.e., y equals to 0), then obtaining a real-time value of the electrical signal x through the PCBA board, then bringing the real-time value into the linear function of step S1, finally calculating the actual value b1 of b in the linear function after the pressure offset is calculated, and then modifying the linear function y equals to kx + b in step S1 into y equals to kx + b1 through software to achieve the purpose of calibration. The software may be configured to periodically cycle through this step of calibration. .
The invention obtains a zero-pressure automatic calibration device and method for a pressure transmitter, the invention creates the condition that the differential pressure is zero by selecting and opening a corresponding gas circuit switch and inflating by using an electromagnetic valve, then obtains the real-time numerical value of an electric signal x through a PCBA board and brings the real-time numerical value into the originally defined linear function to obtain the offset, and finally ensures that a sensor can output a signal extremely close to an ideal value by replacing the offset through software, thereby finally achieving extremely high measurement precision.
Drawings
FIG. 1 is a schematic structural diagram of a zero-pressure automatic calibration device of a pressure transmitter in embodiment 1;
FIG. 2 is a line graph of the pressure deviation of the sensor in the zero-pressure automatic calibration method of the pressure transmitter in embodiment 1;
fig. 3 is an offset diagram of a pressure offset line of a sensor in the zero-pressure automatic calibration method of the pressure transmitter in embodiment 1.
Fig. 4 is a schematic structural diagram of a zero-pressure automatic calibration device of a pressure transmitter in embodiment 2.
In the reference symbols: a first measured medium 1; a pressure sensitive device 2; a gas circuit switch 3; a PCBA board 4; a first air passage connection port 5; a second gas path connecting port 6; a second measured medium 7; a second solenoid valve 8; a wifi transmitter 9.
Detailed Description
The invention will be further described with reference to the following examples.
Example 1:
as shown in fig. 1, the zero-pressure automatic calibration device for a pressure transmitter provided in this embodiment includes the following devices:
a first measured medium 1 as a measured pressure object;
a pressure sensitive device 2;
a gas circuit switch 3 which can be controlled by software to communicate the measured closed gas circuit with the atmosphere;
a PCBA board 4 for reading the signal of the pressure sensitive device 2 and outputting the converted signal;
the PCBA board 4 is electrically connected with the pressure sensitive device 2, one end of the pressure sensitive device 2 is connected with a first measured medium 1 through a first air path connecting port 5 to form a closed air path, the other end of the pressure sensitive device 2 is communicated with the atmosphere through a second air path connecting port 6, the first air path connecting port 5 is further connected with an air path switch 3 communicated with the atmosphere, when the control air path switch 3 is opened, the closed air path is communicated with the atmosphere, and the state that the differential pressure between the first air path connecting port 5 and the second air path connecting port 6 is zero is achieved.
The air path switch 3 is a first electromagnetic valve.
The pressure sensitive device 2 is a pressure sensor.
Further, still be connected with wifi transmitter 9 on the PCBA board 4.
As shown in fig. 2, the embodiment also discloses a zero-pressure automatic calibration method for a pressure transmitter, which includes modulating a pressure sensitive device 2 into a linear correlation diagram of pressure and signal by a sensor manufacturer, so that when an electrical signal of the pressure sensitive device 2 is read, a corresponding measured medium pressure can be calculated according to a linear function, and the method includes the following specific steps:
s1, acquiring a linear function y which is formed by factory calibration of the sensitive device and is kx + b, wherein the electric signal of the pressure sensitive device is defined as x, and the pressure value is defined as y;
s2, opening the corresponding air circuit switch, inflating with an electromagnetic valve to create a condition of zero differential pressure (i.e., y equals to 0), then obtaining a real-time value of the electrical signal x through the PCBA board, then bringing the real-time value into the linear function of step S1, finally calculating the actual value b1 of b in the linear function after the pressure offset is calculated, and then modifying the linear function y equals to kx + b in step S1 into y equals to kx + b1 through software to achieve the purpose of calibration. The software may be configured to periodically cycle through this step of calibration. .
In this embodiment, since y ═ kx + b is a straight line formed by factory calibration of the sensor, when x is 0.5, theoretically y should be ═ b +0.5k, but actually because of drift of the sensor, when x is 0.5 (signal is 0.5), y and the theoretical value will be shifted up to b1 or down to b2, so the present invention creates a condition of zero voltage (y ═ 0) to read the offset, and the offset is removed by an algorithm in software for calibration purpose.
For example, in this embodiment: definitions x1 ═ 0.5V, y1 ═ 0 Pa; x2 is 4.5V, y2 is 1000Pa, and then the two endpoints are respectively substituted into the linear function y kx + b to obtain the following two equations: 0 ═ k 0.5+ b; 1000 × k 4.5+ b, yielding k × 250, b — 125; the resulting pressure excursion straight line function is: y-250 x-125; at this time, b is-125, as a basic deviation amount, after a period of time, a corresponding air path switch is opened, air is pumped by using an electromagnetic valve to create a condition that the differential pressure is zero, then a real-time value of the electric signal x is obtained through a PCBA board, then the real-time value is brought into a linear function of step S1, finally after the pressure deviation is calculated, b (-125) in the linear function becomes an actual value b1, then the linear function y-kx + b in step S1 is modified into y-kx + b1 through software, and after a period of time, if b in the measured linear function becomes an actual value b2, the linear function y-kx + b2 is cycled.
In particular embodiments the acquisition sensor pressure range may also be greater than or less than 1000Pa and the signal output may also be greater than 4.5V or less than 0.5V or other forms of signal such as a current signal or a digital signal, while the pressure range is 0-1000Pa and the acquisition signal output is 0.5-4.5V, taken as exemplary only!
As shown in fig. 3, in the use process of the sensor, the linear function may shift to the left or right due to the physical characteristics of the sensor itself, for example, when the zero pressure shifts to 0.54V to the right, the pressure calculated according to y being 250x-125 may have a deviation of 10Pa, which reduces the accuracy.
The invention creates the condition that the differential pressure is zero by selectively opening the corresponding gas circuit switch and inflating by using the electromagnetic valve, then obtains the real-time numerical value of the electric signal x through the PCBA board and brings the real-time numerical value into the originally defined linear function to obtain the offset, and finally ensures that the sensor can output signals extremely close to the ideal value by replacing the offset through software, thereby finally achieving extremely high measurement precision.
Example 2:
as shown in fig. 4, in the zero-pressure automatic calibration device for a pressure transmitter provided in this embodiment, the second air path connection port 6 is further connected to the second medium to be measured 7 to form a closed air path, the second air path connection port 6 is further connected to the second electromagnetic valve 8 communicated with the atmosphere, and the two detection correspondences are detected simultaneously through the setting of this embodiment, so that simultaneous pressure adjustment is realized.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The zero-pressure automatic calibration device of the pressure transmitter is characterized by comprising the following equipment:
a first measured medium (1) as a pressure object to be measured;
a pressure sensitive device (2);
a gas path switch (3) which can be controlled by software to communicate the measured closed gas path with the atmosphere;
the PCBA board (4) is used for reading the signal of the pressure sensitive device (2) and outputting the converted signal;
wherein, PCBA board (4) are connected with pressure sensing device (2) electricity, pressure sensing device (2) one end connect first surveyed medium (1) through first gas circuit connector (5) and constitute airtight gas circuit, the other end of pressure sensing device (2) passes through second gas circuit connector (6) and atmosphere intercommunication, still connect on first gas circuit connector (5) with the atmosphere intercommunication gas circuit switch (3), when realizing opening control gas circuit switch (3), in order to guarantee airtight gas circuit intercommunication atmosphere to reach the state that differential pressure is zero between first gas circuit connector (5) and second gas circuit connector (6).
2. The zero-pressure automatic calibration device of the pressure transmitter according to claim 1, characterized in that: the second gas path connecting port (6) is also connected with a second measured medium (7) to form a closed gas path, and the second gas path connecting port (6) is also connected with a second electromagnetic valve (8) communicated with the atmosphere.
3. The zero-pressure automatic calibration device of the pressure transmitter according to claim 1, characterized in that: the air circuit switch (3) is a first electromagnetic valve.
4. The zero-pressure automatic calibration device of the pressure transmitter according to claim 1, characterized in that: the pressure sensitive device (2) is a pressure sensor.
5. The zero-pressure automatic calibration device of the pressure transmitter according to claim 1, characterized in that: the PCBA board (4) is further connected with a wifi transmitter (9).
6. The zero-pressure automatic calibration method of the pressure transmitter is characterized by comprising the following steps of modulating a pressure sensitive device into a pressure and signal linear correlation diagram by a sensor manufacturer, and calculating the corresponding pressure of a measured medium according to a linear function when reading an electric signal of the pressure sensitive device, wherein the method comprises the following specific steps:
s1, acquiring a linear function y which is formed by factory calibration of the sensitive device and is kx + b, wherein the electric signal of the pressure sensitive device is defined as x, and the pressure value is defined as y;
and S2, opening a corresponding air path switch, inflating by using an electromagnetic valve to create a condition that the pressure difference is zero, acquiring a real-time numerical value of the electric signal x through a PCBA board, then carrying the real-time numerical value into the linear function of the step S1, finally calculating an actual numerical value b1 of b in the linear function after the pressure deviation is calculated, and modifying the linear function y-kx + b in the step S1 into y-kx + b1 through software to achieve the aim of calibration.
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| CN202110427839.3A CN112945463A (en) | 2021-04-20 | 2021-04-20 | Zero-pressure automatic calibration device and method for pressure transmitter |
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| CN202110427839.3A CN112945463A (en) | 2021-04-20 | 2021-04-20 | Zero-pressure automatic calibration device and method for pressure transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111567900A (en) * | 2020-04-16 | 2020-08-25 | 歌尔微电子有限公司 | Electronic cigarette control method and electronic cigarette |
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2021
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Application publication date: 20210611 |