CN106767989B - Meter device and calibration method using same - Google Patents
Meter device and calibration method using same Download PDFInfo
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- CN106767989B CN106767989B CN201710017182.7A CN201710017182A CN106767989B CN 106767989 B CN106767989 B CN 106767989B CN 201710017182 A CN201710017182 A CN 201710017182A CN 106767989 B CN106767989 B CN 106767989B
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- 238000005259 measurement Methods 0.000 claims abstract description 38
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
Abstract
The invention provides an instrument device and a calibration method using the same. The meter device of the present invention includes: a physical quantity input output unit capable of inputting and outputting at least one first physical quantity; a physical quantity measuring unit; a physical quantity configuration unit that generates, by operation, at least one value of a second physical quantity from at least one value of a first physical quantity, or at least one value of a first physical quantity from at least one value of a second physical quantity; a display unit; a man-machine interaction unit; a storage unit; and a control unit that performs control such that the first mode is executed in a case where the physical quantity to be measured is the second physical quantity and the standard value of the at least one first physical quantity is not required to be generated and output by the meter device to effect the measurement, and the second mode is executed in a case where the physical quantity to be measured is the second physical quantity and the standard value of the at least one first physical quantity is required to be generated and output by the meter device to effect the measurement.
Description
Technical Field
The invention belongs to the technical field of industrial instruments and instrument detection and calibration, and particularly relates to an instrument device and a calibration method using the same.
Background
In industrial field applications, in order to ensure accuracy of the meter, a measurement value or an indication value provided by the meter device is usually subjected to detection calibration. The basic mode of detection and calibration is to directly compare the measured value or indication value measured by the instrument device with a standard value to determine whether the measured value of the instrument device is accurate or not, and then to implement calibration.
As for meter devices, there are mainly univariate meters and multivariate meters in practical applications. The univariate instrument refers to that after a measured value of a single physical quantity is accessed to the instrument, the measured value of the measured physical quantity is directly displayed on the instrument. However, there are often multiple varying physical quantities in a system that all affect the system, requiring measurements using a multivariable meter.
For calibration of such multivariable meters, two calibration methods, direct comparison calibration and multivariable separation calibration, are currently commonly employed.
Disclosure of Invention
Technical problem to be solved by the invention
The direct comparison calibration is to input a plurality of physical quantities to the measured instrument and the special calibration device at the same time to perform comparison calibration. After a plurality of physical quantities (pressure, temperature, electrical signals, etc.) are input to the meter under test and the dedicated calibration device, the meter under test and the dedicated calibration device process the physical quantities using built-in calculation logic and give final test results, for example: the flow integrating instrument calculates flow information according to pressure (differential pressure), temperature, liquid density, orifice diameter and the like.
In the conventional direct comparison calibration method, only a calibration device special for a certain field can be used in the certain field. For example, a flow-specific calibration device is used in the flow field, a valve-specific calibration device is used when testing the valve opening, and a specific methane concentration calibration device is used when testing the methane concentration. The user needs to equip each device with a special calibration device, which not only brings inconvenience to the use of the user, but also increases the cost of the user. In addition, multiple dedicated calibration devices are not easily portable or usable in the field at the same time, and many meters are calibrated directly in the laboratory.
The multivariable independent calibration is to input a plurality of physical quantities to a measured instrument and a special calibration device at the same time, and then to calibrate the input physical quantities by comparing the measured instrument with the calibration device respectively. Since the measured instrument outputs the final measurement result after performing complex calculation on the input physical quantity, the multivariate independent calibration can perform error estimation on each physical quantity, but cannot perform overall error estimation on the measured instrument (different physical quantities occupy different weights in calculation). Otherwise, it must be done indirectly (manually) by means of an external computing system. However, it is difficult for an external computing system to implement a real-time accurate multivariate computing process, which can cause significant inconvenience to the calibration process.
The invention aims to solve the technical problems, and aims to provide the instrument device and the calibration method which are convenient and easy to use, have strong universality and are suitable for real-time measurement and calibration of instrument equipment.
Means for solving the technical problems
In order to achieve the above object, the present invention provides a meter device comprising: a physical quantity input output unit capable of inputting and outputting at least one first physical quantity; a physical quantity measuring unit that measures a value of at least one first physical quantity input from the physical quantity input-output unit; a physical quantity configuration unit that generates, by operation, a value of the at least one second physical quantity from the value of the at least one first physical quantity or generates a value of the at least one first physical quantity from the value of the at least one second physical quantity; a display unit that displays at least a name and a value of the second physical quantity; the man-machine interaction unit is used for operating the instrument device by a user; a storage unit that stores data required for the meter device; and a control unit that performs control such that, in a case where a physical quantity to be measured is a second physical quantity and the standard value of the at least one first physical quantity is not required to be generated and output by the meter device to effect the measurement, a first mode is performed in which, in a case where a physical quantity to be measured is a second physical quantity and the standard value of the at least one first physical quantity is required to be generated and output by the meter device to effect the measurement, a second mode is performed in which the physical quantity measuring unit is caused to measure the value of the at least one first physical quantity related to the second physical quantity input from the physical quantity input/output unit, the physical quantity configuring unit is caused to generate the value of the second physical quantity from the value of the at least one first physical quantity input, and the display unit is caused to display the name of the second physical quantity and the generated value, and in which the physical quantity configuring unit is caused to generate and output the standard value of the first physical quantity from the set, and the standard value of the physical quantity is caused to display the name of the second physical quantity from the set-at least one second physical quantity input/output unit.
The first physical quantity in the present invention means: the meter can directly detect or generate physical quantities such as pressure, temperature, humidity, voltage, current, etc. The second physical quantity in the present invention means: the physical quantity that the meter cannot directly detect or generate is based on the first physical quantity, for example, a physical quantity converted by a prescribed mathematical formula, such as a (weather) altitude value, an air leakage amount every day and night, a volume flow rate, a methane concentration, a valve opening degree, and the like.
In addition, the present invention provides a calibration method for calibrating a calibrated instrument, characterized in that: the meter device is used for calibrating the calibrated meter, and the calibration method comprises the following steps: a physical quantity name indicating step of indicating, by a user, a name of a physical quantity to be measured by the meter to be calibrated; a mode instruction or judgment step of instructing an operation mode by a user or judging by the meter device whether or not it is necessary to output a standard value of at least one first physical quantity to perform calibration; a first mode execution step of executing the first mode when the first mode is specified or it is determined that it is not necessary to output a standard value of at least one first physical quantity; and a second mode execution step of executing the second mode when the second mode is specified or it is determined that it is necessary to output at least one standard value of the first physical quantity.
The beneficial technical effects of the invention
1. The invention integrates various measuring modules, a physical quantity configuration unit capable of converting physical quantities and an input/output unit of physical quantities such as pressure, current and the like in the instrument device, can intuitively present the value of the final physical quantity, does not need to carry out complicated manual conversion at each verification point when measuring and calibrating the multivariable instrument, is convenient and easy to use, and has high efficiency.
2. The invention can measure and calibrate a plurality of multivariable meters by using one universal meter in the meter device, has strong universality and has the technical effects of expanding the application field of the universal meter and reducing the cost required by calibration.
3. The invention can measure and calibrate the multivariable instrument in real time in the instrument device, and has the technical effects of realizing real-time calculation, real-time adjustment and real-time calibration.
Drawings
Fig. 1 is an overall configuration diagram showing a calibration device according to an embodiment of the present invention.
Fig. 2 is a diagram showing an example of a formula editing interface in the man-machine interaction unit 70 according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing the overall flow of the calibration method according to an embodiment of the present invention.
Fig. 4 is a flowchart showing measurement mode calibration in the calibration method according to an embodiment of the present invention.
Fig. 5 is a schematic diagram showing output mode calibration in the calibration method according to an embodiment of the present invention.
Description of the reference numerals
100 … instrument device, 10 … physical quantity input/output unit, 20 … physical quantity measuring unit, 30 … physical quantity configuration unit, 40 … display unit, 60 … control unit, 70 … human-computer interaction unit, and 80 … storage unit.
Detailed Description
The meter device and the calibration method according to the present invention will be described in detail with reference to the accompanying drawings and examples. The meter device and the calibration method according to the present invention are not limited to the following embodiments, and may be implemented by various modifications. In all embodiments, the same structural elements are denoted by the same reference numerals. For convenience of explanation, the dimensional ratios in the drawings may be different from actual ratios, and some of the structures may be omitted from the drawings.
The meter device 100 according to an embodiment of the present invention includes: a physical quantity input output unit 10, a physical quantity measuring unit 20, a physical quantity configuration unit 30, a display unit 40, a control unit 60, a man-machine interaction unit 70, and a storage unit 80.
The physical quantity input output unit 10 is capable of inputting and outputting at least one first physical quantity. Here, the first physical quantity means: the meter can directly detect or generate physical quantities such as pressure, temperature, humidity, voltage, current, etc. The second physical quantity in the present invention means: the physical quantity that the meter cannot directly detect or generate is based on the first physical quantity, for example, a physical quantity converted by a prescribed mathematical formula, such as a (weather) altitude value, an air leakage amount every day and night, a volume flow rate, a methane concentration, a valve opening degree, and the like.
The physical quantity input/output unit 10 may include, for example, at least one pressure input/output interface (for example, a gas line interface), at least one interface (for example, an electrical connection terminal or a plug and socket), an interface for temperature measurement, an interface for humidity measurement, and the like.
The physical quantity measuring unit 20 measures the value of at least one first physical quantity input from the physical quantity input unit 10. The physical quantity measuring unit 20 may include, for example, a pressure measuring module, a module that measures voltage and current, a temperature measuring module, a humidity measuring module, and the like.
The physical quantity arrangement unit 30 generates a standard value of at least one second physical quantity from the value of at least one first physical quantity or generates a standard value of at least one first physical quantity from the value of at least one second physical quantity by operation.
The first physical quantity is generally functionally related to the second physical quantity. For example, there is a functional relationship between barometric pressure and (weather) altitude, expressed in equation 1, referred to herein as the conversion equation.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
h: a potential height (m) somewhere above (below) the mean sea level;
p: atmospheric pressure at H (hPa);
p 0 : average ofStandard atmospheric pressure at sea level (1013.25 hPa);
T 0 : atmospheric thermodynamic temperature at mean sea level (288.15K);
l: vertical gradient of atmospheric temperature within convection layer (-0.0065K/m);
g 0 : standard gravity acceleration (9.80665 m/s) 2 )；
R: dry air specific gas constant (287.05287J/K kg);
in the above formula 1, P is the atmospheric pressure as the first physical quantity, and H is the (weather) height as the second physical quantity. The conversion formula includes, in addition to the first physical quantity and the second physical quantity, other physical quantities (for example, an atmospheric thermodynamic temperature) and constants (for example, gravitational acceleration). Since the atmospheric thermodynamic temperature and the like at the mean sea level are relatively stable physical quantities, they appear as a fixed value in the conversion formula as constants such as gravitational acceleration, and they are called environmental parameters and the like in the present invention.
By a conversion formula based on the functional relation, a (weather) altitude value as a second physical quantity can be generated from the measured atmospheric pressure as the first physical quantity. The physical quantity arrangement unit 30 may perform the above-described operation to convert at least one first physical quantity into at least one second physical quantity or convert at least one second physical quantity into at least one first physical quantity, for example, based on a formula indicating a relationship between the first physical quantity and the second physical quantity.
Here, the conversion formula of the first physical quantity and the second physical quantity may be directly input from the outside by the user using the man-machine interaction unit 70 described below, or may be stored in the storage unit 80 described below in advance. Of course, the relationship between the first physical quantity and the second physical quantity is not limited to the functional relationship shown above, but may be other relationships, such as a table. Such a table may be stored in the storage unit 80 in advance. Based on the instruction of the user, the physical quantity configuration unit 30 can select a corresponding formula to perform calculation or convert the first physical quantity into the second physical quantity or convert the second physical quantity into the first physical quantity using a table or the like under the control of the control unit 60.
The display unit 40 can display at least the name and the value of the second physical quantity, or can display the name and the value of the first physical quantity, or the like, based on the control of the control unit 60. The display unit 40 may be, for example, a commonly used display screen such as a liquid crystal display screen or an organic EL display screen. An important feature of the present invention is that the meter device 100 includes the physical quantity configuration unit 30, and therefore the display unit 40 is also capable of displaying a formula indicating the relationship of the first physical quantity and the second physical quantity in the preferred embodiment of the present invention, and is also capable of being used for the human-computer interaction unit 70 to input and edit the formula, as described below.
The control unit 60 sends instructions to the physical quantity configuration unit 30, the physical quantity measurement unit 20, the physical quantity input output unit 10, and the like to control them. The control unit 60 may include a microprocessor, digital signal processor, or other hardware processor.
The human-computer interaction unit 70 is used for a user to operate the meter device 100, for example, to instruct a physical quantity to be measured, to instruct the start of measurement, and the like. An important feature of the present invention is that the meter device 100 includes the physical quantity configuration unit 30, and thus the man-machine interaction unit 70 includes a formula editing interface that can input and edit a conversion formula of the first physical quantity and the second physical quantity in the preferred embodiment of the present invention. The user can create or edit a corresponding conversion formula or select a previously stored or edited formula through the formula editing interface. The man-machine interaction unit 70 may be a touch panel disposed at the display unit 40, in which case the user can perform input and editing of formulas through a formula editing interface such as that shown in fig. 2.
The storage unit 80 is capable of storing at least a conversion formula of the first physical quantity and the second physical quantity input or edited via the man-machine interaction unit 70. Of course, the conversion formula of the first physical quantity and the second physical quantity, and common coefficients such as the circumference ratio, the gravitational acceleration, and the like may be stored in the storage unit 80 in advance. In addition, the storage unit 80 may store therein operating states, environmental parameters, and the like regarding the meter to be calibrated.
The memory unit 80 may be any known volatile and/or non-volatile memory that stores data and/or instructions. The memory unit 80 may include, for example, read-only memory (ROM), random-access memory (RAM), flash memory, magnetic storage media, optical disks, erasable programmable read-only memory (EPROM), and programmable read-only memory (PROM). The storage unit 80 may be non-removable, removable or a combination of the two.
In the present invention, the control unit 60 performs control such that the first mode is executed in the case where the physical quantity to be measured is the second physical quantity and the standard value of at least one first physical quantity is not required to be generated and output by the meter device 100 to realize the measurement, and the second mode is executed in the case where the physical quantity to be measured is the second physical quantity and the standard value of at least one first physical quantity is required to be generated and output by the meter device 100 to realize the measurement.
The determination as to whether or not the standard value of the at least one first physical quantity needs to be output may be performed by the user through the man-machine interaction means, or may be performed by the control unit 60, for example, based on the name of the second physical quantity instructed by the user or the operation state of the physical quantity input/output means 10 (for example, when any one of the first physical quantities is not input to the meter device 100), the control unit 60 determines that the standard value of the at least one first physical quantity needs to be output to complete the measurement, and the standard value of the at least one first physical quantity may be obtained by performing an inverse function operation based on the standard value of the second physical quantity set by the user.
In the first mode, the physical quantity measuring unit 20 is caused to measure the value of at least one first physical quantity related to the second physical quantity input from the physical quantity input/output unit 10, the physical quantity configuring unit 30 is caused to generate a standard value of the second physical quantity from the value of the at least one first physical quantity input, and the display unit 40 is caused to display the name and the standard value of the second physical quantity generated.
In the second mode, the physical quantity arrangement unit 30 is caused to generate and output a standard value of the first physical quantity from the set standard value of at least one second physical quantity, and the display unit 40 is caused to display the name and standard value of the set second physical quantity. Here, the set standard value of the at least one second physical quantity may be set by a user as appropriate based on a measured value of the physical quantity to be measured (for example, an indication value of a calibrated meter), or may be automatically generated by the meter device 100.
The above description has been made taking the case where the measured physical quantity is the second physical quantity as an example, but the above-described first mode and second mode may be similarly performed when the measured physical quantity is the first physical quantity. In this case, the conversion calculation of the first physical quantity and the second physical quantity may be omitted. This is self-evident.
An example of the formula editing interface of the man-machine interaction unit 60 will be described with reference to fig. 2. The function of creating, editing, selecting and deleting the formula is provided in the formula editing interface. In editing the formula, the corresponding physical quantity, environmental parameter and coefficient, and operation symbol (e.g., "exp", "log", etc. shown in fig. 2) corresponding to a combination of linear, nonlinear, or other operation modes may be selected for editing.
Hereinafter, a calibration method for calibrating a meter to be calibrated using the meter device 100 according to the present embodiment will be described with reference to fig. 3 to 5, taking as an example a case where a physical quantity to be measured by the meter to be calibrated is a second physical quantity. The calibration method includes measurement mode calibration and output mode calibration. In the case where the physical quantity to be measured by the calibration instrument is the second physical quantity and it is not necessary to generate and output a standard value of at least one first physical quantity to achieve the calibration, measurement mode calibration is performed. In the case where the physical quantity to be measured by the calibration apparatus is a second physical quantity and it is necessary to generate and output a standard value of at least one first physical quantity for calibration, output mode calibration is performed. Here, the multivariable meter is described as the meter to be calibrated, but the meter to be calibrated may be a univariate meter. In addition, when calibrating a meter to be calibrated using the meter device 100 of the present invention, it is necessary to appropriately connect the meter device 100 to the meter to be calibrated. Since such connection belongs to the prior art, a specific description is omitted.
Fig. 3 is a schematic diagram showing the overall flow of the calibration method of the present invention. First, the name of the second physical quantity to be measured by the meter to be calibrated is indicated by the user in step S1. Next, in step S2, the operation mode of the meter device 100 is instructed by the user or the meter device 100 automatically judges whether or not it is necessary to generate and output the standard value of at least one first physical quantity based on the name of the second physical quantity described above to realize calibration, and when the measurement mode is instructed or it is judged that it is not necessary to output the standard value of at least one first physical quantity, the flow proceeds to step S3, where the measurement mode calibration is started under the control of the control unit 60 in this step S3. When the output mode is instructed or it is determined that the output of the standard value of at least one first physical quantity is necessary in step S2, the flow proceeds to step S4, where execution of the output mode calibration is started under the control of the control unit 60 in step S4. After either the measurement mode calibration or the output mode calibration is completed, in step S5, whether the calibration is completed is instructed by the user, and if the calibration is instructed to be completed, the calibration is completed, and if the calibration needs to be continued, the process returns to step S1 to wait for the next instruction from the user.
In the above-described overall flow shown in fig. 3, a case has been described in which the name of the second physical quantity to be measured by the meter to be calibrated is first indicated by the user, and then whether or not it is necessary to generate and output the standard value of at least one first physical quantity is indicated by the user or automatically judged by the meter device 100, but the present invention is not limited to the above-described embodiment. The name of the second physical quantity to be measured by the meter to be calibrated may also be indicated by the user after the measurement mode calibration or the output mode calibration is indicated by the user. In this case, the name of the second physical quantity to be measured by the meter to be calibrated may be indicated by the user after the measurement mode calibration or the output mode calibration is entered.
Fig. 4 is a flowchart of the calibration method in the measurement mode (i.e., the detailed steps in step S3 of fig. 3). As shown in fig. 4, first, in step S31, a conversion formula including the name of the second physical quantity is searched for in the storage unit 80 based on the name of the second physical quantity indicated by the user in step S1, and in step S32, the search result and the formula editing interface of the man-machine interaction unit 70 are displayed on the display unit 40. At this time, if at least one conversion formula is stored in the storage unit, all the conversion formulas are displayed on the formula editing interface for the user to select and edit. If no conversion formulas are searched, a formula editing interface is displayed to prompt the user to input the conversion formulas. In step S33, a conversion formula is selected, edited, or input by the user through the formula editing interface, at least one first physical quantity corresponding to the second physical quantity to be input is determined, and a confirmation instruction is given after completion. When the user confirms the conversion formula to be used and at least one first physical quantity to be input, the value of the at least one first physical quantity is input into the meter device 100 via the physical quantity input output unit 10 in step S34.
In step S35, the physical quantity measuring unit 20 is caused to measure the value of at least one first physical quantity related to the second physical quantity input from the physical quantity input-output unit 10, and the measured value of the at least one first physical quantity is input to the physical quantity configuring unit 30.
In step S36, the physical quantity configuration unit 30 generates a value X of the second physical quantity from the measured value of the first physical quantity based on the conversion formula determined in step S33.
In step S37, the value X of the generated second physical quantity (as a standard value of the second physical quantity for calibration) is displayed on the display unit 40 together with the name of the second physical quantity. A measured value R of a second physical quantity measured by a user and a calibrated instrument 0 And comparing to obtain a difference value between the two. Based on the result of the comparison, calibration of the calibrated meter is performed.
In the above measurement mode calibration, the actual physical quantity (pressure, temperature, electric signal, etc.) is input to the meter device 100 as the calibration device, a corresponding multivariable conversion formula (e.g., a functional relationship created through a formula editing interface) is selected, and the physical quantity configuration unit calculates a standard value of the physical quantity measured by the meter under test in real time from the change in the input physical quantity, and displays the standard value in real time. Therefore, the real-time output value of the measured instrument can be compared with the standard value of the calibration device, and the measurement mode calibration is realized.
Compared with the traditional calibration, the calibration method provided by the invention intuitively presents the value of the final physical quantity, does not need to carry out complicated manual conversion at each verification point, is convenient and easy to use, and has high efficiency.
And moreover, the universal instrument can be used for measuring and calibrating various multivariable instruments, so that the universal instrument has the technical effects of expanding the application field of the universal instrument and reducing the cost required by calibration.
Fig. 5 is a schematic diagram showing a calibration method in the output mode (i.e., a detailed step in step S4 of fig. 3). As shown in fig. 5, in step S41, a conversion formula including the name of the second physical quantity is searched for in the storage unit 80 according to the name of the second physical quantity indicated by the user in step S1, and in step S42, the search result and the formula editing interface of the man-machine interaction unit 70 are displayed on the display unit 40. At this time, if at least one conversion formula is stored in the storage unit, all the conversion formulas are displayed on the formula editing interface for the user to select and edit. If no conversion formulas are searched, a formula editing interface is displayed to prompt the user to input the conversion formulas. In step S43, a conversion formula is selected, edited, or input by the user through the formula editing interface, at least one first physical quantity corresponding to the second physical quantity to be input is determined, and a confirmation instruction is given after completion. In step S44, a standard value R of the at least one second physical quantity is set by the user in accordance with the measured value range of the second physical quantity to be measured by the calibrated meter, or the meter device 100 is instructed to automatically generate the standard value R.
In step S45, control unit 60 causes physical quantity arrangement unit 30 to generate a standard value of the first physical quantity from at least one standard value of the second physical quantity set by the user in step S44 or at least one standard value R of the second physical quantity automatically generated by meter device 100, based on the conversion formula confirmed in step S43.
In step S46, a standard value of the generated first physical quantity is output to the calibrated instrument so that the second physical quantity can be measured. Next, in step S47, a standard value R of at least one second physical quantity set by the user or automatically generated by the meter device 100 is displayed on the display deviceA display unit 40 for displaying a measured value R of the second physical quantity to be measured by the user based on the standard value of the first physical quantity by the calibration instrument 0 And comparing the obtained value with a set standard value R of the second physical quantity to obtain a difference value between the two values. Based on the result of the comparison, calibration of the calibrated meter is performed.
In the output mode calibration, a corresponding multivariable conversion formula (such as a function relation established by inverse function editing) is selected for a certain second physical quantity to be measured by a calibrated instrument, a standard quantity of a certain first physical quantity of the instrument device 100 serving as a calibration device is output, and is connected to an instrument input end, and the real-time output quantity value of the measured instrument is compared with a nominal value through the change of the standard quantity output value, so that the real-time measurement calibration of the output quantity value of the multivariable instrument is realized, namely the output mode calibration (such as the comparison of the real-time output quantity value of the measured instrument and the standard quantity value of the calibration device through the change of the standard pressure output value provided by the instrument device 100 serving as the calibration device) is realized.
The output mode calibration realizes a multi-variable standard device based on the measurement mode calibration method, which not only can perform multi-variable standard measurement, but also can not perform multi-variable standard output. And obtaining a multi-variable standard measurement value through multi-variable standard measurement, and obtaining a multi-variable standard output value through adjustment control of multi-variable standard output.
In the output mode calibration, the multi-variable standard output can be regulated in real time to perform real-time calculation calibration, so that the calibration method provided by the invention has the effects of real-time calculation, real-time regulation and real-time calibration compared with the prior art.
Compared with the traditional calibration, the calibration method of the output mode intuitively presents the value of the final physical quantity, does not need to carry out complicated manual conversion at each verification point, is convenient and easy to use, and has high efficiency.
And moreover, the universal instrument can be used for measuring and calibrating various multivariable instruments, so that the universal instrument has the technical effects of expanding the application field of the universal instrument and reducing the cost required by calibration.
In the arrangement of the plurality of physical quantities of the meter device 100, the pressure may be selected as the main variable. In this case, the first physical quantity includes a pressure, and the physical quantity measuring unit 20 includes a pressure measuring module that measures the pressure. The meter apparatus 100 further includes a standard pressure providing unit that may include a pressure controller, a pressure generating unit, and a pressure pipe, and in the output mode calibration, the pressure controller controls the pressure generated by the pressure generating unit to a pressure corresponding to a standard value (target pressure value) of the second physical quantity generated by the physical quantity configuring unit 30 based on the set pressure value based on the pressure within the pressure pipe measured by the pressure measuring module, and outputs the pressure to the external test device/system via the pressure pipe. The pressure generating means may be provided in the meter device 100 or may be provided outside the meter device 100.
In addition, the physical quantity measuring unit of the meter device 100 of the present invention may further include: the device comprises a temperature measurement module, a current measurement module, a voltage measurement module, an on-off measurement module and a current output module. The pressure measurement module is an external module of the system and is connected with the system through an aviation plug wire. The system provides two paths of aviation interfaces (A/B), and each interface can be arbitrarily externally connected with a pressure or temperature measuring module. Thus, two pressure measurement modes, two temperature measurement modes and one pressure measurement mode and one temperature measurement mode can be provided according to the needs of the system.
Hereinafter, specific embodiments of the present invention will be described.
< example 1: differential pressure flowmeter application (measurement mode calibration) >
Differential pressure flow meters are based on bernoulli's equation and fluid continuity equation, and according to the throttling principle, when a fluid flows through a throttling element (e.g., a standard orifice plate, a standard nozzle, a long-diameter nozzle, a classical venturi nozzle, a venturi nozzle, etc.), a differential pressure is generated before and after the fluid, and the differential pressure value is proportional to the square of the flow. In the differential pressure type flowmeter, the differential pressure flowmeter of the standard orifice plate throttling device has the advantages of simple structure, low manufacturing cost, full research and standardized application. Hereinafter, a case where the orifice plate flowmeter is calibrated by the meter device 100 of the present invention will be described.
Volume flow Q f Equation 2 is satisfied between the differential pressure value Δp before and after the orifice plate.
Q f : volume flow under working conditions, m 3 /s；
c: outflow coefficient, dimensionless;
beta: D/D, dimensionless;
d: the inner diameter of the pore plate is mm under the working condition;
d: the inner diameter of an upstream pipeline and a downstream pipeline under working conditions is mm;
epsilon: coefficient of expansion, dimensionless;
Δp: differential pressure values, pa, of the front and back of the orifice plate;
ρ 1 : density of fluid under working conditions, kg/m 3 。
In the present embodiment, the meter device 100 is used to calibrate a differential pressure type flow meter as a meter to be measured. At this time, Δp (differential pressure value before and after the orifice plate) is a first physical quantity, and in the present embodiment, for example, two pressure detection modules are provided to measure pressures before and after the orifice plate to obtain a pressure difference value, Q f The (volume flow rate under the operating condition) is a second physical quantity, and the remaining physical quantities can be obtained from environmental parameters or the like, and can be stored in the meter device 100 in advance or can be input in the formula editing interface. For example, the following data are possible.
c：0.606209；
β：0.542035；
d：0.044417m；
D：0.08194489m；
ε：1.000000；
ρ 1 ：911.9927kg/m 3 。
Substituting these data into the above formula (2) can giveIn calibration, the meter device 100 is connected to a differential pressure type flowmeter as a meter to be measured through a known pipe. Thereafter, the volumetric flow rate Q, which is the name of the second physical quantity to be measured by the meter to be calibrated, is indicated by the user, the meter device 100 performs measurement mode calibration according to the flowcharts shown in fig. 3 and 4, and when the fluid flows, the meter device 100 detects the pressure before and after the orifice plate, and Q, which is the second physical quantity, is obtained using the above formula 2 f The value is displayed on the display unit 40 for comparison with the measured value of the differential pressure type flowmeter to determine whether the differential pressure type flowmeter has an error or not for calibration.
In the present embodiment, the calibration of the differential pressure type flowmeter can be performed in real time by using the meter device 100 as the universal meter, and compared with the prior art, not only the real-time calculation real-time calibration can be realized, because the special flowmeter for calibration can be omitted, but also the technical effect of being able to expand the application field of the universal meter and reduce the cost required for the calibration can be achieved.
In the example, the case where the differential pressure type flow meter as the meter under test is calibrated using the meter device 100 is described, but the present invention is not limited to the above-described embodiment. In addition to calibrating a differential pressure type flow meter as a meter under test, the meter device 100 of the present invention can also directly measure flow as a differential pressure type flow meter. The differential pressure type flowmeter can replace a special differential pressure type flowmeter to measure the flow, and has the technical effects of expanding the application field of a universal instrument and reducing the cost required by measurement.
< example 2: application example of optical interference methane concentration measuring device ((pressure output mode calibration))
An optical interferometry methane measuring device is a portable instrument for quantitatively analyzing gas components by measuring the change of the refractive index of the gas, and the measuring range is mainly (0-10)% CH 4 And (0-100)% CH 4 Two kinds. (0-10)% CH 4 The measuring device is used for measuring the methane volume fraction in the underground air of the coal mine to be lower than 10% CH 4 Is a location of (a).(0-100)% CH4 meter is used to measure the methane volume fraction in the underground coal mine air above 10% CH 4. The tester mainly comprises a circuit, an optical path, an air path and other systems.
The assay of the assay device uses a pressure method. According to the working principle of the measuring device, when no methane gas exists in the measured environment, the methane chamber and the air chamber of the measuring device are filled with air, the refractive index and the optical path are the same, and interference fringes in the measuring device do not move. When methane gas exists in the measured environment, the refractive index changes due to the change of the gas component of the methane chamber, the optical path of the methane chamber also changes, and the interference fringes move. The amount of movement of the interference fringes is proportional to the methane volume fraction. By measuring this amount of movement, the methane volume fraction of the air can be measured. When the methane chamber is filled with air as the air chamber and the pressure of the methane chamber is changed, the refractive index and the optical path of the gas in the methane chamber are also changed, and the interference fringes are also moved. The amount of movement of the interference fringes is proportional to the pressure applied to the methane chamber. Under a certain temperature condition, the volume fraction of methane and the pressure which cause the same movement amount of interference fringes accord with the conversion relation of the formula 3.
P=x. 1.7665. … (formula 3) (273+t)
Wherein x: methane volume fraction,% CH, corresponding to pressure P 4 ；
P: at the ambient temperature t, the methane volume fraction x% CH of the corresponding determinator 4 The pressure value, pa, of the point;
t: ambient temperature, c.
In the present embodiment, the meter device 100 is used to calibrate the methane concentration meter as the meter under test. At this time, x (methane volume fraction corresponding to pressure P) is a second physical quantity, P is a first physical quantity which is a pressure value to be output, which is reversely calculated by equation 3, and t (ambient temperature) is a parameter or the first physical quantity. The above formula 3 may be stored in the meter device 100 in advance, or may be edited via a formula editing interface of the man-machine interaction unit 60.
When calibration is performed with the meter device 100, output mode calibration is performed in accordance with the flowcharts shown in fig. 3 and 5. User canManually typing the value% CH of methane volume fraction x 4 (percentage value), the meter device 100 automatically calculates P (pressure value) from x according to the above formula 3, and starts pressure output (automatic control). After the pressure is stable, the measured value or indication value of the calibrated instrument is compared with the standard value output by the instrument device 100, and then the error evaluation is performed on the measured instrument.
The error calculation formula: error= (meter measured indicator) - (standard value). The allowable range of the indication error is shown in JJG 677-2006 optical interferometry methane determinator and JJG 1040-2008 digital interferometry methane determinator.
The test data obtained by testing the optical interferometry methane measuring device at an ambient temperature of 20℃are shown in Table 1 below.
[ Table 1 ]
In Table 1, the methane volume fraction (% CH) in the standard value 4 ) To the value (second physical quantity) set by the meter device 100, the pressure (kPa) is the passing% CH 4 And the pressure value calculated by the formula, namely the output value of the measured instrument; indication of the meter being tested (%CH) 4 ) To provide the meter device 100 with an indication of the meter to be measured when the calculated pressure (kPa) is supplied to the meter to be measured, the indication error is a set methane volume fraction (%ch) 4 ) The percentage of the difference between the standard value of (c) and the indication of the meter being measured. An error assessment of the optical interferometry methane determinator may be performed based on the test data to perform the calibration.
In example 2, the optical interferometry methane measuring device can be measured and calibrated in real time, and compared with the prior art, the optical interferometry methane measuring device has the technical effects of realizing real-time calculation, real-time adjustment and real-time calibration. Further, since the calibration of the optical interferometry methane measuring device can be performed with the meter device 100 as a general-purpose meter, in particular, the calibration can be performed with the pressure generated and outputted by the meter device 100, there is also a technical effect that the application field of the general-purpose meter can be expanded and the cost required for the calibration can be reduced.
In example 2, the case where the ambient temperature is 20 ℃, that is, t is a parameter was described, but the present invention is not limited to the above embodiment, and the present invention can be implemented by the meter device 100 even when t is a first physical quantity, that is, a variable. At this time, the physical quantity measuring unit 20 of the meter device 100 may be provided with a temperature measuring unit to detect the ambient temperature in real time. While the description has been made of the case where the user has entered the percentage value of the methane volume fraction x, the present invention is not limited to the above embodiment, and the control unit 60 may control the meter device 100 to perform calibration of the methane measuring instrument as the meter under test, for example, at (0 to 100)% CH according to the pre-stored expression 3 when the user instructs to start calibration of the methane measuring instrument 4 Automatically generating a plurality of corresponding pressure values P in sequence to perform a (pressure) output mode.
< example 3: application example of valve position indicator ((Current output mode calibration) >)
The valve is a control component in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing backflow, stabilizing pressure, diverting or overflow pressure relief and the like. Valves for fluid control systems range from the simplest shut-off valves to the various valves used in extremely complex automatic control systems, which are quite diverse in variety and specification. The valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like.
Valve position indicators are typically used with valves to indicate valve opening (opening angle or percentage). Valves in an automatic control system include I/P converters (current/pressure converters), a drive gas source, actuators, valve bodies, etc. The valve position indicator receives an external control signal, typically a (4-20) mA current signal, to control the opening of the valve.
Hereinafter, a case of calibrating the valve position indicator by using the meter device 100 of the present invention will be described.
Equation 4 is satisfied between the valve opening d and the current C input to the valve.
Wherein, d: valve opening (degree);
c: current (mA) input to the valve;
I 0％ : a lower limit (mA) of the valve input current signal;
I 100％ : an upper limit (mA) of the valve input current signal;
d 0％ : a lower limit (degree) of the valve opening angle;
d 100％ : upper limit (degree) of valve opening angle.
In the present embodiment, output mode calibration is performed using the meter device 100 according to the flowcharts shown in fig. 3 and 5, and the valve position indicator as the meter under test is calibrated. At this time, C (current input to the valve, mA) is a first physical quantity, which is generated and output by the meter device 100, d (valve opening degree, degree) is a second physical quantity, and the remaining physical quantity can be obtained from environmental parameters or the like, and may be stored in the meter device 100 in advance or input in a formula editing interface of the man-machine interaction unit. In this embodiment, 5299 from Valworx is used as a test device.
[ Table 2 ]
In table 2, the valve opening degree (degree) in the standard value is a value set by the meter device 100 (standard value of the second physical quantity), the current (mA) is a current value calculated by a standard value and a formula of the set valve opening degree, that is, an output value to the meter under test, the indication value (degree) of the meter under test is an indication value of the meter under test when the meter device 100 supplies the current corresponding to the calculated current value to the meter under test, and the indication error is a difference between the standard value of the set valve opening degree and the indication value of the meter under test. The valve opening degree, which is a standard value of the second physical quantity, may be set by the user through the man-machine interaction unit, or may be automatically and sequentially generated within the upper and lower limits of the valve opening angle according to the prestored equation 4 by controlling the meter device 100 by the control unit 60.
Therefore, the relation between the input current and the opening angle of the valve position indicator can be easily calculated, when the instrument device 100 outputs a corresponding current signal, the valve position indicator drives the valve actuating mechanism and displays the current valve opening angle, and the valve position indicator can be calibrated and tested by comparing the calibrated output signal (standard signal) with the indication angle of the tested valve. The valve position indicator may be error assessed based on the test data in table 2 to perform calibration.
In the above embodiment 3, the user only needs to store in the meter device 100 in advance or input a corresponding conversion formula before calibration, and set the standard value of the second physical quantity in the calibration process, so that the operation is simple, compared with the traditional calibration, the value of the final physical quantity is more intuitively presented, complicated manual conversion is not needed at each verification point, the reusability is high, the user only needs to input a correct formula once, the input is not needed to be repeated, and the working efficiency is high. Further, since the calibration of the valve position indicator can be performed with the meter device 100 as a general-purpose meter, in particular, the calibration can be performed with the current generated and outputted by the meter device 100, there is also a technical effect that the application field of the general-purpose meter can be expanded and the cost required for the calibration can be reduced.
In the description of the above embodiment, only a specific embodiment is illustrated, and the structure, connection manner, etc. of each component are not limited thereto, and all equivalent changes and modifications made on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Various modifications and corrections can be made by those skilled in the art within the scope of the idea of the present invention, and it can be understood that these modifications and corrections also fall within the scope of the present invention. For example, it is within the scope of the present invention for a person skilled in the art to add, delete, or change the design of the constituent elements, or add, omit, or change the conditions of the steps to each of the above embodiments as appropriate, as long as the gist of the present invention is included.
Industrial applicability
The instrument device and the calibration method can be widely applied to the field of calibration of field instruments or industrial automation process instruments and the field of automatic pressure calibration.
Claims (8)
1. A meter apparatus, comprising:
a physical quantity input output unit capable of inputting and outputting at least one first physical quantity;
a physical quantity measuring unit that measures a value of at least one first physical quantity input from the physical quantity input-output unit;
a physical quantity configuration unit that generates, by operation, a value of the at least one second physical quantity from the value of the at least one first physical quantity or generates a value of the at least one first physical quantity from the value of the at least one second physical quantity;
a display unit that displays at least a name and a value of the second physical quantity;
the man-machine interaction unit is used for operating the instrument device by a user;
a storage unit that stores data required for the meter device; and
a control unit that performs control such that, in a case where the physical quantity to be measured is a second physical quantity and the meter device is not required to generate and output a standard value of the at least one first physical quantity to achieve the measurement, a first mode is performed, in a case where the physical quantity to be measured is a second physical quantity and the meter device is required to generate and output a standard value of the at least one first physical quantity to achieve the measurement,
In the first mode, the physical quantity measuring unit is caused to measure a value of at least one first physical quantity related to the second physical quantity input from the physical quantity input-output unit, the physical quantity configuring unit is caused to generate a value of the second physical quantity from the value of the at least one first physical quantity input, and the display unit is caused to display a name of the second physical quantity and the generated value,
in the second mode, the physical quantity configuration unit generates and outputs a standard value of the first physical quantity from the set standard value of the at least one second physical quantity from the physical quantity input output unit, and causes the display unit to display a name of the second physical quantity and the set standard value; the physical quantity configuration unit performs the operation based on a conversion formula capable of converting the at least one first physical quantity into the at least one second physical quantity or converting the at least one second physical quantity into the at least one first physical quantity; the man-machine interaction unit comprises a formula editing interface which can input and edit the formula,
the physical quantity configuration unit performs the operation based on the conversion formula determined by the user through the man-machine interaction unit;
The first physical quantity is a physical quantity that can be directly detected or generated, and includes pressure, temperature, humidity, voltage, and current;
the second physical quantity is a physical quantity which cannot be directly detected or generated, and is obtained by converting a prescribed mathematical formula based on the first physical quantity, and comprises a meteorological height value, an air leakage quantity per day and night, a volume flow, a methane concentration and a valve opening.
2. The meter apparatus of claim 1, wherein:
the storage unit can store the conversion formula in advance, and can store the conversion formula input or edited by the user,
the physical quantity configuration unit is capable of reading the conversion formula including the name of the at least one second physical quantity from the storage unit according to the name of the at least one second physical quantity input by the user from the man-machine interaction unit,
and editing and/or selecting the formula by the user through the man-machine interaction unit based on the read conversion formula.
3. The meter apparatus of any one of claims 1-2, wherein:
the physical quantity measuring unit includes a pressure measuring module that measures pressure.
4. A meter apparatus as claimed in claim 3, wherein:
and a standard pressure supply unit for supplying a standard pressure,
in the second mode, the standard pressure provided by the standard pressure providing unit is output to the outside.
5. A calibration method for calibrating a calibrated instrument, characterized by:
calibrating a calibrated meter using the meter device of any one of claims 1 to 4,
the calibration method comprises the following steps:
a physical quantity name indicating step of indicating, by a user, a name of a physical quantity to be measured by the meter to be calibrated;
a mode instruction or judgment step of instructing an operation mode by a user or judging by the meter device whether or not it is necessary to output a standard value of at least one first physical quantity to perform calibration;
a first mode execution step of executing the first mode when the first mode is specified or it is determined that it is not necessary to output a standard value of at least one first physical quantity; and
a second mode execution step of executing the second mode when the second mode is specified or it is determined that it is necessary to output a standard value of at least one first physical quantity.
6. The method of calibrating according to claim 5,
The first mode performing step includes the steps of:
a first physical quantity input step of inputting, through the physical quantity input/output unit, a value of at least one first physical quantity related to a second physical quantity to be measured into the meter device, after the user has determined the second physical quantity to be measured and a conversion formula to be used;
a first physical quantity measuring step of measuring a value of at least one first physical quantity input in association with the second physical quantity;
a second physical quantity generating step of generating a value of the second physical quantity from the measured value of the at least one first physical quantity based on the conversion formula; and
and a display step of displaying the generated value of the second physical quantity on a display unit together with the name of the second physical quantity.
7. The method of calibrating according to claim 5,
the second mode performing step includes the steps of:
a second physical quantity standard value generation step of automatically generating a standard value of the second physical quantity by the meter device set or instructed by the user after the user determines the second physical quantity to be measured and the conversion formula to be used;
a first physical quantity standard value generation step of generating a standard value of the first physical quantity from the standard value of the second physical quantity generated in the second physical quantity standard value generation step, based on a conversion formula determined by a user;
A first physical quantity standard value output step of outputting the standard value of the first physical quantity generated in the first physical quantity standard value generation step to the calibrated instrument;
and a display step of displaying the generated standard value of the second physical quantity on a display unit together with the name of the second physical quantity.
8. The method of calibrating according to claim 6 or 7, wherein,
further comprises: a conversion formula searching step of searching a conversion formula containing the name of the physical quantity in the storage unit according to the name of the physical quantity indicated by the user, and displaying a search result and a formula editing interface of the conversion formula search on a display unit;
a conversion formula determining step: the conversion formula is selected, edited, or entered by a user through a formula editing interface, and the conversion formula to be used is determined.
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| EP17891430.5A EP3569988B1 (en) | 2017-01-10 | 2017-08-22 | Instrument calibration device and calibration method using same |
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