Automatic testing device and method for static pressure influence of differential pressure instrument

Abstract

The application provides a kind of automatic testing device and method for static pressure influence of differential pressure instrument, including digital pressure controller, three-way pipeline, high pressure solenoid valve and control terminal, the pressure output port of digital pressure controller is communicated with the first pipe mouth of three-way pipeline, the second pipe mouth of three-way pipeline is communicated with the high pressure end of the differential pressure type pressure measuring instrument to be measured, the third pipe mouth of three-way pipeline is communicated with the low pressure end of the differential pressure type pressure measuring instrument to be measured through high pressure solenoid valve, the differential pressure type pressure measuring instrument to be measured sends pressure value to control terminal, and control terminal is connected with digital pressure controller and high pressure solenoid valve respectively;The application can realize automatic testing for static pressure influence of differential pressure instrument, has the advantages of simple structure, higher testing reliability, wide applicability, and is suitable for static pressure influence performance testing of various types of differential pressure type pressure measuring instruments.

Description

Technical Field

[0001] This invention relates to an automatic testing device and method for the static pressure effect of differential pressure instruments, belonging to the field of metrology and testing technology. Background Technology

[0002] Differential pressure measuring instruments, such as differential pressure sensors, differential pressure transmitters, and differential pressure digital pressure gauges, are widely used in aerospace, remote sensing, environmental monitoring, medical devices, and industrial production. They are used to measure differential pressure values ​​in the environment and are a crucial type of control measuring instrument; their accuracy and reliability directly affect the performance of the measuring device. To ensure that differential pressure measuring instruments in actual use can accurately transmit measurement information, they need to be periodically verified or calibrated according to national verification regulations to guarantee the accuracy and reliability of the measured values.

[0003] Static pressure effect is a crucial indicator for differential pressure measuring instruments. JJG 875-2019 "Verification Procedure for Digital Pressure Gauges", JJG 882-2019 "Verification Procedure for Pressure Transmitters", and JJG 860-2015 "Verification Procedure for Pressure Sensors (Static)" all specify requirements for static pressure effect testing. Considering actual working conditions, testing the static pressure effect of differential pressure measuring instruments is essential. Currently, the standard instruments used for verifying differential pressure measuring instruments cannot provide differential pressure values ​​under specified static pressure. Most methods involve venting the low-pressure end to atmosphere and pressurizing the high-pressure end, which only detects the indication error of differential pressure measuring instruments to the atmosphere and the effect under zero static pressure. This differs significantly from actual working conditions and cannot meet the actual testing requirements for differential pressure measuring instruments.

[0004] In the prior art, such as the invention patent application number 202510639730.4, "A device and method for verifying the static pressure influence of differential pressure transmitters," a verification device and method suitable for the static pressure influence of differential pressure transmitters are proposed, but they have the following disadvantages: 1. All operations are performed manually, which is complex. According to the verification procedure, repeatability testing requires the same pressure point during the pressure increase and decrease cycle. It is almost impossible to manually adjust and set the same differential pressure point during the pressure increase and decrease cycle test.

[0005] 2. A differential pressure environment is created by manually changing the pressure at the high-pressure and low-pressure ends of the differential pressure transmitter by setting a first pressure regulator and a second pressure regulator at the low-pressure end. However, changing the pressure at the low-pressure end will cause a certain static pressure change, which deviates from the static pressure required for the test and does not meet the national standard requirements for static pressure influence testing.

[0006] 3. The applicable static pressure range of the system is not specified. The pressure regulation range of the second pressure regulator is (-50~50) kPa, and the pressure regulation accuracy is 0.01 kPa. If the static pressure is 1 MPa, the pressure regulation accuracy of this invention application will be better than one ten-thousandth, which is much higher than the performance of the highest domestic pressure benchmark. Therefore, it is extremely difficult for this invention application to be applicable at higher pressures such as above 1 MPa.

[0007] The above issues are problems that should be considered and resolved during the detection of the static pressure effect of differential pressure instruments. Summary of the Invention

[0008] The purpose of this invention is to provide an automatic testing device and method for the static pressure effect of differential pressure instruments, which solves the problems of complex operation and insufficient detection reliability in the prior art.

[0009] The technical solution of this invention is: An automatic testing device for the static pressure effect of differential pressure instruments includes a digital pressure controller, a three-way pipeline, a high-pressure solenoid valve, and a control terminal. The pressure output port of the digital pressure controller is connected to the first port of the three-way pipeline, the second port of the three-way pipeline is connected to the high-pressure end of the differential pressure measuring instrument under test, and the third port of the three-way pipeline is connected to the low-pressure end of the differential pressure measuring instrument under test through the high-pressure solenoid valve. The differential pressure measuring instrument under test sends a pressure value to the control terminal, and the control terminal is connected to the digital pressure controller and the high-pressure solenoid valve respectively.

[0010] Furthermore, the differential pressure measuring instrument to be measured is a differential pressure digital pressure gauge, a differential pressure transmitter, or a differential pressure sensor.

[0011] Furthermore, when the differential pressure measuring instrument to be measured is a differential pressure digital pressure gauge, the differential pressure measuring instrument to be measured directly sends the pressure value to the control terminal; when the differential pressure measuring instrument to be measured is a differential pressure transmitter or differential pressure sensor, the differential pressure measuring instrument to be measured sends the pressure value to the control terminal through a digital multimeter.

[0012] Furthermore, the digital pressure controller can be either a digital pressure controller with its own pressure source or connected to a pressure source.

[0013] Furthermore, the control terminal includes a parameter configuration module, a leakage self-test module, and an over-tolerance self-test module. Parameter configuration module: used to set the static pressure value to be measured; Leakage self-test module: After the pressure value of the differential pressure measuring instrument under test reaches the static pressure value to be tested, the current pressure value is obtained after a set time. If the difference between the current pressure value and the static pressure value to be tested exceeds the threshold, the detection is stopped and a leakage is indicated. Out-of-tolerance self-test module: When the difference between the pressure value of the differential pressure measuring instrument under test and the reading of the digital pressure controller is greater than the maximum permissible error, the test stops and an instrument fault is indicated; when the difference between the reading of the differential pressure measuring instrument under test and the reading of the digital pressure controller is not greater than the maximum permissible error, the pressure values ​​of the digital pressure controller and the differential pressure measuring instrument under test are read multiple times, and the average value of each is taken as the standard value and the measured value.

[0014] A method for using the automatic testing device for the static pressure influence of differential pressure instruments as described in any of the above-mentioned claims includes the following steps: Step 1: The control terminal acquires a set of static pressure values ​​to be measured and the number of measurement cycles; Step 2: The control terminal controls the digital pressure controller to generate a static pressure based on the current static pressure value to be measured, controls the high-pressure solenoid valve to remain open, and after the differential pressure measuring instrument reaches the first static pressure and holds the pressure for a set time, the current pressure value is obtained, and then proceeds to the next step 3. Step 3: When the difference between the current pressure value and the current static pressure value to be measured exceeds the threshold, the detection is stopped; when the difference between the current pressure value and the current static pressure value to be measured does not exceed the threshold, the high-pressure solenoid valve is closed, the control terminal controls the digital pressure controller to output the pressure of the first measurement pressure point according to the preset program, and at the same time reads and records the pressure values ​​of the differential pressure measuring instrument to be measured and the digital pressure controller. Step 4: When the difference between the pressure value of the differential pressure measuring instrument under test and the value indicated by the standard instrument is greater than the maximum permissible error, stop the test and indicate an instrument malfunction; when the difference between the pressure value of the differential pressure measuring instrument under test and the value indicated by the standard instrument is not greater than the maximum permissible error, read the pressure values ​​of the digital pressure controller and the differential pressure measuring instrument under test multiple times, take their average values ​​as the standard value and the measured value, and store them. Step 5: After updating the next static pressure value to be measured to the current static pressure value, return to step 2 until all static pressure values ​​to be measured and the number of measurement cycles are completed, then proceed to the next step 6. Step 6: Generate a test report, which includes all measurement data and the corresponding uncertainties.

[0015] Furthermore, it also includes step 7: generating measurement results including error, hysteresis, nonlinearity, and repeatability, and outputting and storing an analysis report on the impact of different set static pressures on the measurement results.

[0016] The beneficial effects of this invention are: I. This automatic testing device and method for the static pressure effect of differential pressure instruments can realize the automatic testing of the static pressure effect of differential pressure instruments. Static pressure and differential pressure can be generated by the same pressure source, without the need to set up separate static pressure modules and differential pressure modules to generate static pressure and differential pressure respectively. It has the advantages of simple structure, higher test reliability and wide applicability, and is suitable for static pressure effect performance testing of various types of differential pressure measuring instruments.

[0017] II. This automatic testing device and method for the static pressure effect of differential pressure instruments can achieve automated detection and has a self-test function during operation. It can give an immediate warning for instruments that exceed tolerances or leak, thus avoiding a lot of wasted testing time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the automatic testing device for the static pressure effect of differential pressure instruments according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the control terminal in the embodiment; Figure 3 This is a flowchart illustrating the automatic testing method for the static pressure effect of differential pressure instruments in an embodiment. Among them: 1-Digital pressure controller, 2-T-way pipe, 3-Differential pressure measuring instrument to be measured, 4-High-pressure solenoid valve, 5-Control terminal, 6-Digital multimeter. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] The embodiment provides an automatic testing device for the static pressure effect of differential pressure instruments, such as Figure 1 The system includes a digital pressure controller 1, a three-way pipe 2, a high-pressure solenoid valve 4, and a control terminal 5. The pressure output port of the digital pressure controller 1 is connected to the first port of the three-way pipe 2. The second port of the three-way pipe 2 is connected to the high-pressure end of the differential pressure measuring instrument 3 to be measured. The third port of the three-way pipe 2 is connected to the low-pressure end of the differential pressure measuring instrument 3 to be measured through the high-pressure solenoid valve 4. The differential pressure measuring instrument 3 to be measured sends a pressure value to the control terminal 5. The control terminal 5 is connected to the digital pressure controller 1 and the high-pressure solenoid valve 4 respectively.

[0021] This automatic testing device for the static pressure effect of differential pressure instruments can automatically test the static pressure effect of differential pressure instruments. Static pressure and differential pressure can be generated by the same pressure source, eliminating the need for separate static pressure and differential pressure modules. It has the advantages of simple structure, higher test reliability, and wide applicability, and is suitable for testing the static pressure effect performance of various types of differential pressure measuring instruments.

[0022] The differential pressure measuring instrument 3 to be measured is a differential pressure digital pressure gauge, differential pressure transmitter, or differential pressure sensor. When the differential pressure measuring instrument 3 to be measured is a differential pressure digital pressure gauge, it directly sends the pressure value to the control terminal 5; when it is a differential pressure transmitter or differential pressure sensor, it sends the pressure value to the control terminal 5 through a digital multimeter 6. The digital pressure controller 1 is either a digital pressure controller with its own pressure source or connected to a pressure source.

[0023] Control terminal 5 includes a parameter configuration module, a leakage self-test module, and an out-of-tolerance self-test module, such as... Figure 2 : Parameter configuration module: used to set the static pressure value to be measured; Leakage self-test module: After the pressure value of the differential pressure measuring instrument 3 reaches the static pressure value to be tested, the current pressure value is obtained after a set time, such as 30 seconds. If the difference between the current pressure value and the static pressure value to be tested exceeds the threshold, the detection is stopped and a leakage is indicated. Out-of-tolerance self-test module: When the difference between the pressure value of the differential pressure measuring instrument 3 under test and the reading of the digital pressure controller 1 is greater than the maximum permissible error, the test stops and an instrument fault is indicated; when the difference between the reading of the differential pressure measuring instrument 3 under test and the reading of the digital pressure controller 1 is not greater than the maximum permissible error, the pressure values ​​of the digital pressure controller 1 and the differential pressure measuring instrument 3 under test are read multiple times, and the average value of each is taken as the standard value and the measured value.

[0024] This automatic testing device for the static pressure effect of differential pressure instruments can achieve automated detection and has a self-test function during operation. It can provide immediate warnings for instruments that exceed tolerances or leak, thus avoiding a significant waste of testing time.

[0025] This automatic testing device for the static pressure effect of differential pressure instruments addresses the limitations of existing differential pressure measurement equipment and methods, which all employ two pressure sources: a static pressure source and a differential pressure source. The static pressure source generates static pressure, and the differential pressure source is used to measure the differential pressure point, which is typically done manually. This invention, however, can complete the measurement of both static pressure and differential pressure using only one pressure source, resulting in a simpler structure and more reliable test results.

[0026] This automatic testing device for the static pressure effect of differential pressure instruments has a control terminal 5 with multiple RS232 ports, which are connected to a digital pressure controller 1, a high-pressure solenoid valve 4, and a digital multimeter 6, respectively. The digital pressure controller 1 controls the differential pressure measuring instrument 3 under test for detection and data transmission. The control terminal 5 has a database that stores the communication port settings, control functions, and reading functions of the digital pressure controller 1, as well as the communication port settings and reading functions of the digital multimeter 6 and the instrument under test 3. Based on the different types of instruments under test 3 and in accordance with the corresponding national verification regulations, it stores measurement program information including measurement points and the number of measurement cycles. It also stores the measurement results of the differential pressure measuring instrument 3 under test, classifying and storing them according to the unique number of the instrument 3 and employing a data processing method. It supports simultaneous measurement of multiple differential pressure measuring instruments 3 with the same range and model. Control terminal 5 controls high-pressure solenoid valve 4 via RS232 port to control the on / off state of the air circuit. The high-pressure digital pressure controller 1 has a range of 25 MPa and an accuracy class of 0.01. High-pressure solenoid valve 4 has a pressure resistance of 25 MPa. Data processing follows the verification procedure, using EXCE1 format and automatically outputting printed results.

[0027] like Figure 3 The embodiment also provides a method for using the automatic testing device for the static pressure effect of differential pressure instruments as described in any of the above embodiments, comprising the following steps: Step 1: Control terminal 5 acquires a set of static pressure values ​​to be measured and the number of measurement cycles; Step 2: Control terminal 5 controls digital pressure controller 1 to generate the first static pressure based on the current static pressure value to be measured, controls high pressure solenoid valve 4 to remain open, and after the differential pressure measuring instrument 3 reaches the first static pressure, it holds the pressure for a set time, such as 30 seconds, and obtains the current pressure value, then proceeds to the next step 3. Step 3: When the difference between the current pressure value and the current static pressure value to be measured exceeds the threshold, the detection is stopped; when the difference between the current pressure value and the current static pressure value to be measured does not exceed the threshold, the high-pressure solenoid valve 4 is closed, the control terminal 5 controls the digital pressure controller 1 to output the pressure of the first measurement pressure point according to the preset program, and at the same time reads and records the pressure values ​​of the differential pressure measuring instrument 3 and the digital pressure controller 1. Step 4: When the difference between the pressure value of the differential pressure measuring instrument 3 under test and the value indicated by the standard instrument is greater than the maximum permissible error, stop the test and indicate an instrument malfunction; when the difference between the pressure value of the differential pressure measuring instrument 3 under test and the value indicated by the standard instrument is not greater than the maximum permissible error, read the pressure values ​​of the digital pressure controller 1 and the differential pressure measuring instrument 3 under test multiple times, take their average values ​​as the standard value and the measured value and store them. Step 5: After updating the next static pressure value to be measured to the current static pressure value, return to step 2 until all static pressure values ​​to be measured and the number of measurement cycles are completed, then proceed to the next step 6. Step 6: Generate a test report, which includes all measurement data and the corresponding uncertainties.

[0028] This automatic testing method for the static pressure effect of differential pressure instruments also includes step 7: generating measurement results including error, hysteresis, nonlinearity, and repeatability, and outputting and storing an analysis report on the impact of different set static pressures on the measurement results.

[0029] The automatic testing device and method for static pressure influence of differential pressure instruments described in this embodiment can meet the static pressure influence test requirements of differential pressure measuring instruments with static pressure up to 24MPa. It is applicable to instruments with communication ports, but its application is not limited to this. For a small number of instruments without communication ports, the system can set the data reading to manual input mode and adopt semi-automatic detection.

[0030] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the scope of protection of the present invention.

Claims

1. An automatic testing device for the static pressure influence of differential pressure instruments, characterized in that: The device includes a digital pressure controller, a three-way pipe, a high-pressure solenoid valve, and a control terminal. The pressure output port of the digital pressure controller is connected to the first port of the three-way pipe. The second port of the three-way pipe is connected to the high-pressure end of the differential pressure measuring instrument to be measured. The third port of the three-way pipe is connected to the low-pressure end of the differential pressure measuring instrument to be measured through the high-pressure solenoid valve. The differential pressure measuring instrument to be measured sends a pressure value to the control terminal. The control terminal is connected to both the digital pressure controller and the high-pressure solenoid valve.

2. The automatic testing device for the static pressure influence of differential pressure instruments as described in claim 1, characterized in that: The differential pressure measuring instrument to be measured is a differential pressure digital pressure gauge, differential pressure transmitter, or differential pressure sensor.

3. The automatic testing device for the static pressure influence of differential pressure instruments as described in claim 2, characterized in that: When the differential pressure measuring instrument to be measured is a differential pressure digital pressure gauge, the differential pressure measuring instrument directly sends the pressure value to the control terminal; when the differential pressure measuring instrument to be measured is a differential pressure transmitter or differential pressure sensor, the differential pressure measuring instrument to be measured sends the pressure value to the control terminal through a digital multimeter.

4. The automatic testing device for the static pressure influence of differential pressure instruments as described in any one of claims 1-3, characterized in that: The digital pressure controller can be either a digital pressure controller with its own pressure source or connected to a pressure source.

5. The automatic testing device for the static pressure influence of differential pressure instruments as described in any one of claims 1-3, characterized in that: The control terminal includes a parameter configuration module, a leakage self-test module, and an over-tolerance self-test module. Parameter configuration module: used to set the static pressure value to be measured; Leakage self-test module: After the pressure value of the differential pressure measuring instrument under test reaches the static pressure value to be tested, the current pressure value is obtained after a set time. If the difference between the current pressure value and the static pressure value to be tested exceeds the threshold, the detection is stopped and a leakage is indicated. Out-of-tolerance self-test module: When the difference between the pressure value of the differential pressure measuring instrument under test and the reading of the digital pressure controller is greater than the maximum permissible error, the test stops and an instrument fault is indicated; when the difference between the reading of the differential pressure measuring instrument under test and the reading of the digital pressure controller is not greater than the maximum permissible error, the pressure values ​​of the digital pressure controller and the differential pressure measuring instrument under test are read multiple times, and the average value of each is taken as the standard value and the measured value.

6. A method for using the automatic testing device for the static pressure influence of differential pressure instruments as described in any one of claims 1-5, characterized in that: Includes the following steps, Step 1: The control terminal acquires a set of static pressure values ​​to be measured and the number of measurement cycles; Step 2: The control terminal controls the digital pressure controller to generate a static pressure based on the current static pressure value to be measured, controls the high-pressure solenoid valve to remain open, and after the differential pressure measuring instrument reaches the first static pressure and holds the pressure for a set time, the current pressure value is obtained, and then proceeds to the next step 3. Step 3: When the difference between the current pressure value and the current static pressure value to be measured exceeds the threshold, the detection is stopped; when the difference between the current pressure value and the current static pressure value to be measured does not exceed the threshold, the high-pressure solenoid valve is closed, the control terminal controls the digital pressure controller to output the pressure of the first measurement pressure point according to the preset program, and at the same time reads and records the pressure values ​​of the differential pressure measuring instrument to be measured and the digital pressure controller. Step 4: When the difference between the pressure value of the differential pressure measuring instrument under test and the value indicated by the standard instrument is greater than the maximum permissible error, stop the test and indicate an instrument malfunction; when the difference between the pressure value of the differential pressure measuring instrument under test and the value indicated by the standard instrument is not greater than the maximum permissible error, read the pressure values ​​of the digital pressure controller and the differential pressure measuring instrument under test multiple times, take their average values ​​as the standard value and the measured value, and store them. Step 5: After updating the next static pressure value to be measured to the current static pressure value, return to step 2 until all static pressure values ​​to be measured and the number of measurement cycles are completed, then proceed to the next step 6. Step 6: Generate a test report, which includes all measurement data and the corresponding uncertainties.

7. The automatic testing method for the static pressure influence of differential pressure instruments as described in claim 6, characterized in that: It also includes step 7, generating measurement results including error, hysteresis, nonlinearity, and repeatability, and outputting and storing an analysis report on the impact of different set static pressures on the measurement results.

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