Integrated test platform and test method for valve cooling sensor

Abstract

The invention discloses a comprehensive test platform and test method for a valve cooling sensor, and the test platform comprises a water tank, a circulating booster pump, a pressure sensor verification branch, a conductivity sensor verification branch, a liquid level sensor verification branch, and a control unit. A water tank is connected with the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch which are arranged in parallel through a main pipeline, and the circulating booster pump and the pressure gauge are arranged on the main pipeline; and the control unit is connected with the circulating booster pump, the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch, and is used for controlling the circulating booster pump and the sensor verification branch to work and acquiring and displaying a verification data result. According to the comprehensive test platform for the valve cooling sensor, different to-be-verified sensors can be effectively verified, the process of disassembling and returning to a factory in a traditional method is avoided, the efficiency is remarkably improved, and the economic cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sensor testing, and in particular to a comprehensive testing platform and a testing method for a valve-cooled sensor. Background Art

[0002] With the development of industrial automation and intelligent control technology, sensors are increasingly used in valve cooling systems. They are widely used in the fields of electricity, chemical industry, petroleum, etc. to monitor parameters such as pressure, temperature, flow, liquid level and conductivity in real time to ensure stable operation of the system. However, sensors are susceptible to their own errors, environmental interference and aging in long-term operation, which may cause system misjudgment, refusal to operate or malfunction, bringing economic and safety risks. At present, sensor calibration mainly relies on disassembly and return to the factory, which has a long cycle and high cost, and it is difficult to meet the needs of rapid response on site. At the same time, domestic sensors still need to be fully verified and quantified under real working conditions in terms of static stability, dynamic response, anti-interference performance, etc.

[0003] Patent application number 201310722409.X "Sensor calibration device and method" This method involves a calibration device connected to a sensor via an I2C interface. The calibration module communicates with the sensor via the I2C interface and includes the following components: a calibration kernel, a start value register, a target value register, and a tolerance register. The calibration kernel can provide calibration values ​​to the sensor and adjust the output of the sensor. The start value register stores the initialized calibration value, the target value register stores the expected output value, and the tolerance register stores the tolerance range. The calibration kernel writes the initialized calibration value to the sensor via the I2C interface, reads the output value, and compares it with the expected value. If the output value is within the tolerance range, the calibration is completed; otherwise, the calibration kernel modifies the calibration value until the output value meets the requirements. However, this method has the following shortcomings:

[0004] 1. The calibration value needs to be adjusted repeatedly, which is suitable for simple linear sensors, but cannot be effectively calibrated for nonlinear sensors.

[0005] 2. Poor adaptability. When the environment changes, recalibration is required.

[0006] The "Sensor Calibration Method" of patent number 201710258680.0 involves numbering M sensors, calculating the calibration coefficient of each sensor, and generating a deviation calibration coefficient table including the number and calibration coefficient. At the same time, the calibration coefficient when the combined module is used in conjunction with each sensor is calculated, and a combined module deviation calibration coefficient table is generated. Based on these two calibration coefficient tables, a comprehensive deviation calibration coefficient table for the M sensors and the combined module is generated. Finally, the client calls the corresponding calibration coefficient from the comprehensive deviation calibration coefficient table for calibration by the sensor number.

[0007] However, the limitation of this method is that for complex nonlinear sensors, the calibration coefficients caused by environmental changes vary greatly, and it is difficult to achieve accurate calibration simply by adjusting the coefficients.

[0008] Therefore, there is an urgent need to build a comprehensive valve cooling system experimental platform for sensor performance verification, which can accurately simulate real working conditions, scientifically verify the performance indicators of multiple types of sensors, improve the application reliability of sensors in valve cooling systems, and provide technical support for the safe operation of power systems, industrial process control and automated monitoring, and promote continuous innovation and development in the fields of sensor technology and industrial automation. Summary of the invention

[0009] In view of the above problems, the present invention proposes a comprehensive test platform for valve cooling sensors.

[0010] The technical means adopted by the present invention are as follows:

[0011] A valve cooling sensor comprehensive test platform, comprising: a water tank, a circulating booster pump, a pressure sensor calibration branch, a conductivity sensor calibration branch, a liquid level sensor calibration branch and a control unit;

[0012] The water tank is connected to one end of the main pipeline, the main pipeline is provided with the circulating booster pump and the pressure gauge, the other end of the main pipeline is connected to the pressure sensor verification branch, the conductivity sensor verification branch and one end of the liquid level sensor verification branch arranged in parallel, and the other ends of the pressure sensor verification branch and the conductivity sensor verification branch are connected to the water tank through a return pipe;

[0013] The control unit is connected to the circulating booster pump, the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch, and is used to control the circulating booster pump, the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch to work and obtain and display the verification data results.

[0014] Further, the pressure sensor verification branch includes a pressure sensor verification pipeline, a calibrated pressure sensor and a first electric switch valve, one end of the pressure sensor verification pipeline is connected to the water distribution pipe, and the other end is connected to the return pipe, the first electric switch valve, the calibrated pressure sensor and the interface of the pressure sensor to be verified are arranged in series on the pressure sensor verification pipeline, and the first electric switch valve is arranged on one end of the pressure sensor verification pipeline connected to the water distribution pipe;

[0015] The conductivity sensor verification branch includes a conductivity sensor verification pipeline, a calibrated conductivity sensor and a second electric switch valve. One end of the conductivity sensor verification pipeline is connected to the water distribution pipe, and the other end is connected to the return pipe. The second electric switch valve, the calibrated conductivity sensor and the conductivity sensor interface to be verified are arranged in series on the conductivity sensor verification pipeline. The second electric switch valve is arranged on one end of the conductivity sensor verification pipeline connected to the water distribution pipe.

[0016] The liquid level sensor verification branch includes a liquid level sensor verification pipeline, a calibrated liquid level sensor, a liquid level tube and a third electric switch valve. One end of the liquid level sensor verification pipeline and one end of the water distribution pipe are connected to one end of the main pipeline through a three-way joint. The third electric switch valve is arranged on the liquid level sensor verification pipeline. The other end of the liquid level sensor verification pipeline is connected to one end of two liquid level tubes arranged in parallel, wherein the calibrated liquid level sensor is installed on the upper end of one of the liquid level tubes, and an interface for the liquid level sensor to be verified is arranged on the upper end of the other liquid level tube.

[0017] Furthermore, the liquid level sensor verification branch also includes a visual liquid level tube; the visual liquid level tube is arranged in parallel with the liquid level tube; and an air release valve is provided on the upper end connecting pipe of the two liquid level tubes.

[0018] Furthermore, it also includes a high and low temperature test box, which is connected to the water tank, and a fifth manual valve and a sixth manual valve are arranged between the high and low temperature test box and the water tank.

[0019] Furthermore, the high and low temperature test box is also provided with interfaces for calibrated temperature sensors and temperature sensors to be calibrated.

[0020] Furthermore, it also includes a liquid level sensor drainage pipeline connected to the liquid level sensor verification pipeline, a fourth electric switch valve is provided on the liquid level sensor drainage pipeline, and a first manual valve is provided at the end of the liquid level sensor drainage pipeline.

[0021] Furthermore, it also includes a water replenishment branch, which includes a water replenishment pipe and a self-priming pump;

[0022] One end of the water supply pipe is connected to the drainage pipeline of the liquid level sensor, and the other end is connected to the return pipe. The self-priming pump is arranged on the water supply pipe.

[0023] Further, it also includes a reserved area branch;

[0024] The reserved area branch includes a first reserved pipe and a second reserved pipe, one end of the first reserved pipe is connected to the main pipeline, and the other end is provided with a second manual valve, one end of the second reserved pipe is connected to the return pipe, and the other end is provided with a third manual valve, and the return pipe is provided with a fourth manual valve.

[0025] A testing method using the valve-cooled sensor comprehensive testing platform described in the present application comprises the following steps: Step 1, installing the sensor to be tested on the corresponding sensor testing branch;

[0026] Step 2: The control unit controls the corresponding sensor verification branch to open and work, and the control unit controls the circulating booster pump to work according to the set verification mode, so that the coolant in the water tank enters the corresponding sensor verification branch through the main pipeline;

[0027] Step 3: The control unit obtains the verification data results in real time and displays them.

[0028] Furthermore, the method further comprises the following steps:

[0029] The sensor to be calibrated is one or more of a pressure sensor, a conductivity sensor, a liquid level sensor and a temperature sensor;

[0030] When the sensor to be calibrated is a pressure sensor, the calibration mode includes forward pressure measurement, reverse pressure measurement, and pressure measurement affected by temperature;

[0031] The specific process of the pressure forward measurement is as follows:

[0032] Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor verification pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, gradually increase the inverter output frequency of the circulation booster pump according to the set increment value to gradually increase the pressure of the coolant in the main pipeline until the coolant pressure in the main pipeline reaches the maximum value. The control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor verification pipeline and the pressure sensor to be verified installed in the interface of the pressure sensor to be verified in real time, obtains the verification data result according to the pressure value and displays it;

[0033] The specific process of the pressure reverse measurement is as follows:

[0034] Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor verification pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline, adjust the inverter output frequency of the circulation booster pump to the maximum, so that the coolant pressure value in the main pipeline reaches the maximum value, after the pressure value in the main pipeline is stable, gradually reduce the inverter output frequency of the circulation booster pump according to the set increase and decrease value to gradually reduce the pressure of the coolant in the main pipeline until the coolant pressure value in the main pipeline returns to zero, and the control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor verification pipeline and the pressure sensor to be verified installed in the interface of the pressure sensor to be verified in real time, obtains the verification data result according to the pressure value and displays it;

[0035] The specific process of measuring the influence of temperature on pressure is as follows:

[0036] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding pressure forward measurement or pressure reverse measurement process is performed to complete the pressure temperature effect measurement;

[0037] When the sensor to be calibrated is a liquid level sensor, the calibration mode includes forward liquid level measurement, reverse liquid level measurement, and liquid level measurement affected by temperature;

[0038] The specific process of the liquid level forward measurement is as follows:

[0039] Open the seventh manual valve on the main pipeline, the eighth manual valve and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, observe the liquid level of the visual liquid level tube and adjust the opening ratio of the third electric regulating valve according to the set increment value so that the liquid level in the liquid level tube gradually increases until the liquid level in the liquid level tube reaches the maximum value. The control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level tube and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data result according to the liquid level value and displays it;

[0040] The specific process of reverse liquid level determination is as follows:

[0041] Open the seventh manual valve on the main pipeline, the eighth manual valve and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump to make the liquid level in the liquid level pipe reach the maximum value, close the circulation booster pump and the third electric switch valve on the liquid level sensor verification pipeline, open the fourth electric switch valve and the self-priming pump on the liquid level sensor drainage pipeline, observe the liquid level of the visible liquid level pipe and adjust the eighth manual valve on the liquid level sensor verification pipeline according to the set decrement value, so that the liquid level in the liquid level pipe gradually decreases until the liquid level in the liquid level pipe reaches the minimum value, and the control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level pipe and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data results according to the liquid level values ​​and displays them;

[0042] The specific process of measuring the liquid level affected by temperature is as follows:

[0043] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding liquid level forward measurement or liquid level reverse measurement process is performed to complete the measurement of the liquid level affected by temperature;

[0044] When the sensor to be calibrated is a conductivity sensor, the calibration mode includes fixed conductivity measurement, temperature effect on conductivity measurement, and conductivity sensitivity measurement;

[0045] The specific process of the fixed conductivity determination is as follows:

[0046] Open the seventh manual valve on the main pipe, the fourth manual valve on the return pipe, and the second electric switch valve on the conductivity sensor verification pipe, start the circulation booster pump, and read the pressure value in the main pipe through the pressure gauge on the main pipe. After the pressure value in the main pipe stabilizes, the control unit obtains the conductivity values ​​of the aligned conductivity sensor in the conductivity sensor verification pipe and the conductivity sensor to be verified installed in the interface of the conductivity sensor to be verified in real time, obtains the verification data results according to the conductivity values, and displays them;

[0047] The specific process of measuring the effect of temperature on conductivity is as follows:

[0048] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the fixed conductivity measurement process is performed to complete the measurement of the influence of temperature on conductivity.

[0049] The specific process of conductivity sensitivity determination is as follows:

[0050] Add different concentrations of conductivity concentrate into the water tank, and perform fixed conductivity measurement processes in sequence to complete the conductivity sensitivity measurement;

[0051] When the sensor to be calibrated is a temperature sensor, the calibration mode includes forward temperature measurement and reverse temperature measurement;

[0052] The specific process of the temperature forward determination is as follows:

[0053] The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the position value of the test chamber is set to 100°C. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature rise process and observe the temperature indication when the temperature reaches the maximum value, and observe the accuracy of the calibrated temperature sensor;

[0054] The specific process of the temperature reverse determination is as follows:

[0055] The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the test chamber position value is set to -30℃. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature drop process, observe the temperature reading of the temperature sensor when the temperature reaches the minimum value, and observe the accuracy of the calibrated temperature sensor.

[0056] Compared with the prior art, the valve cooling sensor comprehensive test platform disclosed in the present invention has the following beneficial effects: the test platform disclosed in the present application can effectively calibrate different sensors to be calibrated by setting a water tank, a circulating booster pump, a pressure sensor calibration branch, a conductivity sensor calibration branch, a liquid level sensor calibration branch and a control unit, thereby avoiding the disassembly and return process in the traditional method, significantly improving efficiency and reducing economic costs. Through precise verification, the platform effectively reduces the risk of system misjudgment, refusal or malfunction caused by sensor errors, ensuring the safety and reliability of the valve cooling system. The platform is widely used in multiple industrial fields such as electricity, chemical industry, and petroleum, providing efficient and reliable sensor verification and optimization support for different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a first direction axis view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0058] Figure 2It is a second direction axis view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0059] Figure 3 It is a front view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0060] Figure 4 It is a side view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0061] Figure 5 It is a first partial enlarged view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0062] Figure 6 It is a second partial enlarged view of the valve cooling sensor comprehensive test platform disclosed in the present invention;

[0063] Figure 7 This is a schematic diagram of the control unit in the present invention;

[0064] Figure 8 This is a schematic diagram of the valve cooling sensor comprehensive test platform disclosed in the present invention.

[0065] In the figure: 1, water tank; 10, main pipeline; 11, pressure gauge; 12, return pipe; 13, water distribution pipe; 14, three-way joint; 15, seventh manual valve; 16, fourth manual valve; 17, platform bottom plate; 18, bracket; 190, first pipeline; 191, second pipeline; 2, circulation booster pump; 3, pressure sensor calibration branch; 30, pressure sensor calibration pipeline; 31, calibrated pressure sensor; 32, first electric switch valve; 33, pressure sensor interface to be calibrated; 34, pressure sensor to be calibrated; 35, stop valve; 4, conductivity sensor calibration branch; 40, conductivity sensor calibration pipeline; 41, calibrated conductivity sensor; 42, second electric switch valve; 43, conductivity sensor interface to be calibrated; 44, conductivity sensor to be calibrated; 5, liquid level sensor calibration branch; 50, liquid level Sensor calibration pipeline; 51. Aligned liquid level sensor; 52. Liquid level pipe; 53. Third electric switch valve; 54. Interface of liquid level sensor to be calibrated; 55. Liquid level sensor to be calibrated; 56. Visual liquid level pipe; 57. Upper end connecting pipe; 58. Air release valve; 59. Liquid level sensor drainage pipeline; 510. Fourth electric switch valve; 511. First manual valve; 512. Eighth manual valve; 6. Control unit; 61. Terminal box; 7. High and low temperature test box; 70. Fifth manual valve; 71. Sixth manual valve; 72. Aligned temperature sensor; 73. Interface of temperature sensor to be calibrated; 74. Temperature sensor to be calibrated; 8. Water supply branch; 80. Water supply pipe; 81. Self-priming pump; 9. Reserved area branch; 90. First reserved pipe; 91. Second reserved pipe; 92. Second manual valve; 93. Third manual valve. DETAILED DESCRIPTION

[0066] like Figures 1 to 8 As shown, the valve cooling sensor comprehensive test platform disclosed in the present invention comprises: a water tank 1, a circulating booster pump 2, a pressure sensor calibration branch 3, a conductivity sensor calibration branch 4, a liquid level sensor calibration branch 5 and a control unit 6;

[0067] The water tank 1 is connected to one end of a main pipeline 10, on which the circulating booster pump 2 and the pressure gauge 11 are provided, and the other end of the main pipeline 10 is connected to one end of the pressure sensor verification branch 3, the conductivity sensor verification branch 4 and the liquid level sensor verification branch 5 arranged in parallel, and the other ends of the pressure sensor verification branch 3 and the conductivity sensor verification branch 4 are connected to the water tank 1 through a return pipe 12;

[0068] The control unit 6 is connected to the circulating booster pump 2, the pressure sensor verification branch 3, the conductivity sensor verification branch 4 and the liquid level sensor verification branch 5, and is used to control the circulating booster pump 2, the pressure sensor verification branch 3, the conductivity sensor verification branch 4 and the liquid level sensor verification branch 5 to work and obtain and display the verification data results.

[0069] Specifically, in this embodiment, the water tank 1 and the circulation boosting pump 2 are installed on the platform bottom plate 17, one end of the main pipeline 10 is connected to the lower end of the water tank, and the circulation boosting pump 2 is installed on the main pipeline 10. The other end of the main pipeline 10 is connected to one end of the pressure sensor verification branch 3, the conductivity sensor verification branch 4 and the liquid level sensor verification branch 5 arranged in parallel. The other ends of the pressure sensor verification branch 3 and the conductivity sensor verification branch 4 are connected to the water tank 1 through the return pipe 12. On one side of the water tank 1, the pressure sensor verification branch 3, the conductivity sensor verification branch 4 and the liquid level sensor verification branch 5 are installed on the platform bottom plate 17 in sequence along the vertical direction through the bracket 18. On the other side of the water tank 1, a terminal box 61 is provided. A control unit is provided in the terminal box 60. The control unit adopts PLC intelligent control, which can achieve data analysis and real-time recording of process quantities. The connection between the PLC in the terminal box and the pressure sensor, liquid level sensor, and conductivity sensor adopts KVVP6×1.0mm 2 The terminal box is also equipped with a MCGS touch screen as a display interaction device and a hard disk as a data storage device. The PLC on the terminal box can collect the data output by the sensor, summarize and calculate the output data, and calculate its repeatability error, zero drift, and accuracy performance respectively.

[0070] The test platform disclosed in the present application can effectively calibrate different sensors to be calibrated by setting up a water tank, a circulating booster pump, a pressure sensor calibration branch, a conductivity sensor calibration branch, a liquid level sensor calibration branch and a control unit, thereby avoiding the disassembly and return process in the traditional method, significantly improving efficiency and reducing economic costs. Through precise verification, the platform effectively reduces the risk of system misjudgment, refusal to operate or malfunction due to sensor errors, ensuring the safety and reliability of the valve cooling system. The platform is widely used in multiple industrial fields such as electricity, chemical industry, and petroleum, providing efficient and reliable sensor verification and optimization support for different application scenarios.

[0071] Further, the pressure sensor verification branch 3 includes a pressure sensor verification pipeline 30, a calibrated pressure sensor 31 and a first electric switch valve 32, one end of the pressure sensor verification pipeline 30 is connected to the water distribution pipe 13, and the other end is connected to the return pipe 12, the pressure sensor verification pipeline 30 is provided with the first electric switch valve 32, the calibrated pressure sensor 31 and the pressure sensor interface 33 to be verified in series, and the first electric switch valve 32 is provided on the pressure sensor verification pipeline 30 at one end connected to the water distribution pipe 13;

[0072] The conductivity sensor verification branch 4 includes a conductivity sensor verification pipeline 40, a calibrated conductivity sensor 41 and a second electric switch valve 42. One end of the conductivity sensor verification pipeline 40 is connected to the water distribution pipe 13, and the other end is connected to the return pipe 12. The conductivity sensor verification pipeline 40 is provided with the second electric switch valve 42, the calibrated conductivity sensor 41 and the conductivity sensor interface 43 to be verified in series. The second electric switch valve 42 is provided at one end of the conductivity sensor verification pipeline 40 connected to the water distribution pipe 13.

[0073] The liquid level sensor verification branch 5 includes a liquid level sensor verification pipeline 50, a calibrated liquid level sensor 51, a liquid level tube 52 and a third electric switch valve 53. One end of the liquid level sensor verification pipeline 50 and one end of the water distribution pipe 13 are connected to one end of the main pipeline 10 through a three-way joint 14. The third electric switch valve 53 is provided on the liquid level sensor verification pipeline 50. The other end of the liquid level sensor verification pipeline 50 is connected to one end of two liquid level tubes 52 arranged in parallel, wherein the calibrated liquid level sensor 51 is installed on the upper end of one of the liquid level tubes 52, and the upper end of the other liquid level tube 52 is provided with an interface 54 for the liquid level sensor to be verified.

[0074] Specifically, a three-way joint 14 is provided at one end of the main pipeline, and the three-way joint 14 is respectively connected to the main pipeline 10, the water distribution pipe 13 and one end of the liquid level sensor calibration pipeline 50. The water distribution pipe 13 is vertically arranged through the bracket 18, and the other end and the middle of the water distribution pipe 13 are respectively connected to the pressure sensor calibration pipeline and the conductivity sensor calibration pipeline. The pressure sensor calibration pipeline, the conductivity sensor calibration pipeline and the liquid level sensor calibration pipeline are arranged in parallel. The first, second and third electric switch valves are respectively provided on the three calibration pipelines to control the on and off of each pipeline respectively. The pressure sensor calibration pipeline is provided with a calibrated pressure sensor and a pressure sensor interface to be calibrated in series, and the pressure sensor to be calibrated 34 can be installed on the pressure sensor interface to be calibrated. The control unit can The data of the pressure sensor to be tested is collected to realize the calibration of the pressure sensor to be tested. The conductivity test pipeline is provided with a calibrated conductivity sensor and an interface of the conductivity sensor to be tested in series. The conductivity sensor to be tested 44 can be installed on the interface of the conductivity sensor to be tested. The control unit can realize the calibration of the conductivity sensor to be tested by collecting data of the calibrated conductivity sensor and the conductivity sensor to be tested. One end of the liquid level sensor test pipeline is connected to the lower ends of two liquid level tubes arranged in parallel. The upper ends of the two liquid level tubes are respectively provided with the calibrated liquid level sensor and the interface of the liquid level sensor to be tested. The clamp of the liquid level sensor to be tested can be installed with the liquid level sensor 55 to be tested. The control unit can realize the calibration of the liquid level sensor to be tested by collecting data of the calibrated liquid level sensor and the liquid level sensor to be tested. In this embodiment, the calibration liquid level sensor is preferably a capacitive level meter. The main reason why the capacitive level meter is selected as the reference unit is that it has high measurement accuracy, good stability and a wide range of applications. The specific reasons are as follows:

[0075] High measurement accuracy: Based on the principle that the change in liquid level causes the change in capacitance, the capacitance level meter can achieve high-precision measurement of the liquid level, and is particularly suitable for detecting small liquid level fluctuations. At the same time, its output signal is continuous and linear, which is convenient for data processing and comparison.

[0076] Strong anti-interference ability: The capacitance level meter has good anti-interference performance and can effectively resist the influence of environmental electromagnetic interference, temperature fluctuations and other factors on the measurement accuracy to ensure reliable data.

[0077] Adapt to various working conditions: The capacitance level meter has low requirements on the physical properties of the liquid (such as dielectric constant, density, etc.), can maintain good measurement performance in different liquid types and a wide range of operating temperature and pressure, and is suitable for a variety of experimental environments.

[0078] Real-time and fast response: The capacitance level gauge can reflect the liquid level changes in real time and has a fast response speed. It is suitable for working conditions that require dynamic measurement of the liquid level. It complements the physical observation of the visual liquid level tube and improves the efficiency and accuracy of double comparison measurement.

[0079] At the same time, a stop valve 35 is also provided on the pressure sensor calibration pipeline. The stop valve is usually used to control the on and off of the fluid, and its design usually includes components such as a valve body, a valve seat, a valve disc, and a valve stem. In a pipeline system, the left and right sides of the stop valve can refer to the water inlet and the water outlet, respectively. Specifically: Water inlet: The direction in which the fluid enters the valve, usually connected to the upstream part of the pipeline system. This port may be connected to the source of the fluid, or connected to other parts of the pipeline so that the fluid can enter the stop valve and flow downstream. Water outlet: The direction in which the fluid flows out of the valve, usually connected to the downstream part of the pipeline system. This port directs the fluid to the subsequent part of the system, which may be a pressure system, equipment or other pipeline system. The stop valve has a rotating mechanism that can control the flow by changing the position of the valve disc.

[0080] Furthermore, the liquid level sensor verification branch 5 also includes a visual liquid level tube 56 ; the visual liquid level tube 56 is arranged in parallel with the liquid level tube 52 ; and an air release valve 58 is provided on the upper end connecting tube 57 of the two liquid level tubes 52 .

[0081] Specifically, a visual liquid level tube 56 is arranged in parallel on one side of the liquid level tube 52, and the visual liquid level tube 56 is connected to the liquid level tube 52. When liquid is injected into the liquid level tube through the liquid level sensor calibration pipeline, the liquid levels in the liquid level tube and the visual liquid level tube are consistent. Since the visual liquid level tube is arranged, it is convenient for the operator to understand the liquid level height in the liquid level tube and facilitate control.

[0082] Furthermore, it also includes a high and low temperature test box 7, which is connected to the water tank 1, and a fifth manual valve 70 and a sixth manual valve 71 are provided between the high and low temperature test box 7 and the water tank 1.

[0083] Specifically, in this embodiment, the water tank 1 and the high and low temperature test box 7 are arranged side by side, and a first pipeline 190 and a second pipeline 191 are provided between the water tank 1 and the high and low temperature test box. The first pipeline 190 and the second pipeline 191 are respectively provided with a fifth manual valve 70 and a sixth manual valve 71. The first and second pipelines and the fifth and sixth manual valves can realize the circulation of the coolant in the water tank and the high and low temperature test box, and then the coolant in the water tank can be adjusted to the set temperature through the high and low temperature test box, so as to complete the temperature measurement of different sensors to be calibrated.

[0084] Furthermore, the high and low temperature test box 7 is also provided with a calibrated temperature sensor 72 and a temperature sensor interface 73 to be calibrated.

[0085] Specifically, in this embodiment, a calibrated temperature sensor 72 and a temperature sensor interface 73 to be calibrated are installed on the top of the high and low temperature test box 7. The temperature sensor interface 73 to be calibrated can be installed with a temperature sensor 74 to be calibrated. This structure can also be used to calibrate the temperature sensor.

[0086] Furthermore, it also includes a liquid level sensor drainage pipeline 59 connected to the liquid level sensor calibration pipeline 50, a fourth electric switch valve 510 is provided on the liquid level sensor drainage pipeline 59, and a first manual valve 511 is provided at the end of the liquid level sensor drainage pipeline 50.

[0087] Specifically, a liquid level sensor drainage pipeline is also provided on the liquid level sensor calibration pipeline 50, and a fourth electric switch valve and a first manual valve are provided on the liquid level sensor drainage pipeline. The fourth electric switch valve can control the on and off of the liquid level sensor calibration pipeline and the liquid level sensor drainage pipeline. The end of the liquid level sensor drainage pipeline can be connected to the outside through other pipelines. When the liquid level pipe needs to be drained, the third electric switch valve on the liquid level sensor calibration pipeline is closed to achieve disconnection from the main channel, and the fourth electric switch valve is opened to achieve connection between the drainage pipeline and the calibration pipeline. At the same time, the first manual valve at the end of the liquid level sensor drainage pipeline is opened, and the coolant in the liquid level pipe can be discharged through the drainage pipeline.

[0088] Furthermore, it also includes a water replenishment branch 8, and the water replenishment branch 8 includes a water replenishment pipe 80 and a self-priming pump 81;

[0089] One end of the water supply pipe 80 is connected to the liquid level sensor drainage pipeline 59 , and the other end is connected to the return pipe 12 . The self-priming pump 81 is provided on the water supply pipe 80 .

[0090] Specifically, a water replenishment pipe is also connected to the liquid level sensor drainage pipeline, and the other end of the water replenishment pipe is connected to the return pipe. A self-priming pump is provided on the water replenishment pipe. Water can be replenished into the water tank or the coolant in the liquid level pipe can be discharged into the water tank through the water replenishment branch. When water replenishment is needed, the end of the liquid level sensor drainage pipeline is connected to the water replenishment tank through a pipeline, the fourth electric switch valve on the liquid level sensor drainage pipeline is closed, the first manual valve is opened, and the self-priming pump is started. The self-priming pump replenishes the coolant from the water replenishment tank through the drain pipe and the replenishment pipe. The water pipe and the return pipe are transported to the water tank to complete the water replenishment of the water tank; when the coolant in the liquid level pipe needs to be discharged into the water tank, the third electric switch valve on the liquid level sensor verification pipeline is closed to achieve disconnection from the main channel, and the fourth electric switch valve is opened to achieve connection between the drain pipeline and the verification pipeline. At the same time, the first manual valve at the end of the liquid level sensor drain pipeline is closed, and the self-priming pump is started. The self-priming pump transports the coolant in the liquid level pipe to the water tank through the liquid level sensor verification pipeline, the drain pipe, the water replenishment pipe and the return pipe.

[0091] Furthermore, it also includes a reserved area branch 9; the reserved area branch 9 includes a first reserved pipe 90 and a second reserved pipe 91, one end of the first reserved pipe 90 is connected to the main pipeline 10, and the other end is provided with a second manual valve 92, one end of the second reserved pipe 91 is connected to the return pipe 12, and the other end is provided with a third manual valve 93, and the return pipe 12 is provided with a fourth manual valve 16.

[0092] Specifically, a first reserved pipe and a second reserved pipe are respectively provided on the main pipeline and the return pipe, and a second manual valve and a third manual valve are respectively provided at the ends of the first reserved pipe and the second reserved pipe. By setting a reserved area branch, it is realized as an outward extension of the entire system. Specifically, it has two main functions: 1. As an external interface of the deionization circuit, if the conductivity of the entire system continues to exceed the standard and cannot be resolved, it can be connected to the deionization circuit to reduce the conductivity of the entire system; 2. As a reserved port for low-flow flowmeter measurement, if the flowmeter flow to be measured is within the measurement range of the circulating water pump, it can be directly connected to the system for flow measurement.

[0093] ① Implementation of deionization circuit

[0094] The deionization circuit mainly reduces the system conductivity through the deionization column or mixed bed ion exchange column to ensure that the water quality meets the standard. When the system is running, if the conductivity continues to exceed the standard, the deionization circuit can be connected through the reserved interface. The circulating water is transported to the deionization column by a low-pressure pump, and the dissolved ions are removed by cation and anion exchange resins. At the same time, the treatment effect is monitored in real time by the conductivity sensor. The deionized water returns to the main system. If the conductivity does not meet the standard, the treatment time can be extended or the ion exchange resin can be replaced. To improve convenience, a bypass valve design can be added to the circuit to isolate the circuit or stop operation. At the same time, it can be equipped with an automatic control device to dynamically start and stop the circuit according to the sensor data to improve operating efficiency and water quality control accuracy.

[0095] ②Realization of low flow measurement

[0096] Low-flow measurement is achieved by connecting a low-flow flowmeter to a reserved interface, which is suitable for scenarios where the flow is small but precise measurement is required. When the system is running, the flowmeter is connected to the main circuit through a reducing pipe or a diverter, and the water flow in the measurement circuit enters the flowmeter after the flow is stabilized by the regulating valve. The measurement signal is transmitted to the main control system through the data acquisition device for real-time monitoring and recording. To ensure measurement accuracy, a high-precision flowmeter that is adapted to the liquid characteristics of the system should be selected, and a buffer or rectifier should be installed in the circuit to eliminate turbulent interference. After the operation is completed, close the loop bypass valve and restore the system to normal operation to ensure that the main loop flow is not affected

[0097] The valve-cooled sensor comprehensive test platform disclosed in this application can measure pressure, liquid level, and conductivity sensors. The purpose of the measurement is to check the linear response of the sensor when the pressure gradually increases, analyze its measurement accuracy and stability at different pressure points, and determine whether there is hysteresis or system error under different pressure conditions. The specific measurement method is as follows:

[0098] A testing method using the valve cooling sensor comprehensive testing platform described in the present application comprises the following steps:

[0099] Step 1: Install the sensor to be calibrated on the corresponding sensor calibration branch;

[0100] Step 2: The control unit controls the corresponding sensor verification branch to open and work, and the control unit controls the circulating booster pump to work according to the set verification mode, so that the coolant in the water tank enters the corresponding sensor verification branch through the main pipeline;

[0101] Step 3: The control unit obtains the verification data results in real time and displays them.

[0102] Specifically, the sensor to be calibrated is one or more of a pressure sensor, a conductivity sensor, a liquid level sensor and a temperature sensor;

[0103] When the sensor to be calibrated is a pressure sensor, the calibration mode includes forward pressure measurement, reverse pressure measurement, and pressure measurement affected by temperature;

[0104] The pressure sensor is used for the control pressure under the same working conditions. Two pressure sensors are connected in series in the same pipeline. The inverter is used to adjust the water pump's working capacity output to change the pressure of the pipeline system. The readings of the two pressure sensors are collected for measurement. The calibrated pressure measurement range is 0-1.0mpa. Specifically:

[0105] The specific process of the pressure forward measurement is as follows:

[0106] Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor calibration pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, gradually increase the inverter output frequency of the circulation booster pump according to the set increment value to gradually increase the pressure of the coolant in the main pipeline until the coolant pressure in the main pipeline reaches the maximum value. The control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor calibration pipeline and the pressure sensor to be calibrated installed in the pressure sensor interface to be calibrated in real time, obtains the calibration data result according to the pressure value and displays it, that is, it can be realized on the MCGS touch screen to observe whether there is a deviation between the readings of the standard instrument and the measuring instrument during the adjustment process and analyze it;

[0107] The specific process of the pressure reverse measurement is as follows:

[0108] Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor verification pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline, adjust the inverter output frequency of the circulation booster pump to the maximum, so that the coolant pressure value in the main pipeline reaches the maximum value, after the pressure value in the main pipeline is stable, gradually reduce the inverter output frequency of the circulation booster pump according to the set increase and decrease value to gradually reduce the pressure of the coolant in the main pipeline until the coolant pressure value in the main pipeline returns to zero, and the control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor verification pipeline and the pressure sensor to be verified installed in the interface of the pressure sensor to be verified in real time, obtains the verification data result according to the pressure value and displays it;

[0109] The specific process of measuring the influence of temperature on pressure is as follows:

[0110] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding pressure forward measurement or pressure reverse measurement process is performed to complete the pressure temperature effect measurement;

[0111] When the sensor to be calibrated is a liquid level sensor, the calibration mode includes forward liquid level measurement, reverse liquid level measurement, and liquid level measurement affected by temperature;

[0112] The liquid level measurement range is 0-1.7 meters. The measurement adopts physical measurement + instrument measurement double comparison. The equipment test tooling includes a visual liquid level tube and a capacitance liquid level gauge as reference units. Specifically:

[0113] The specific process of the liquid level forward measurement is as follows:

[0114] Open the seventh manual valve on the main pipeline, the eighth manual valve and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, observe the liquid level of the visual liquid level tube and adjust the opening ratio of the third electric regulating valve according to the set increment value so that the liquid level in the liquid level tube gradually increases until the liquid level in the liquid level tube reaches the maximum value. The control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level tube and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data result according to the liquid level value and displays it;

[0115] The specific process of reverse liquid level determination is as follows:

[0116] Open the seventh manual valve on the main pipeline, the eighth manual valve 512 and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump to make the liquid level in the liquid level pipe reach the maximum value, close the circulation booster pump and the third electric switch valve on the liquid level sensor verification pipeline, open the fourth electric switch valve and the self-priming pump on the liquid level sensor drainage pipeline, observe the liquid level of the visible liquid level pipe and adjust the eighth manual valve on the liquid level sensor verification pipeline according to the set decrement value, so that the liquid level in the liquid level pipe gradually decreases until the liquid level in the liquid level pipe reaches the minimum value, and the control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level pipe and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data result according to the liquid level value and displays it;

[0117] The specific process of measuring the liquid level affected by temperature is as follows:

[0118] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding liquid level forward measurement or liquid level reverse measurement process is performed to complete the measurement of the liquid level affected by temperature;

[0119] When the sensor to be calibrated is a conductivity sensor, the calibration mode includes fixed conductivity measurement, temperature effect on conductivity measurement, and conductivity sensitivity measurement;

[0120] The conductivity sensor has a measurement range of 0-20μS / cm. The conductivity is measured using a control measurement under the same working conditions. Two conductivity sensors are connected in series in the same pipeline. In order to make the measurement results more accurate, it is necessary to manually add conductivity standard solution to the system to measure the sensor's sensitivity to conductivity changes. The effect of temperature on conductivity is measured by increasing the system temperature, as follows:

[0121] The specific process of the fixed conductivity determination is as follows:

[0122] Open the seventh manual valve on the main pipe, the fourth manual valve on the return pipe, and the second electric switch valve on the conductivity sensor verification pipe, start the circulation booster pump, and read the pressure value in the main pipe through the pressure gauge on the main pipe. After the pressure value in the main pipe stabilizes, the control unit obtains the conductivity values ​​of the aligned conductivity sensor in the conductivity sensor verification pipe and the conductivity sensor to be verified installed in the interface of the conductivity sensor to be verified in real time, obtains the verification data results according to the conductivity values, and displays them;

[0123] The specific process of measuring the effect of temperature on conductivity is as follows:

[0124] Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the fixed conductivity measurement process is performed to complete the measurement of the influence of temperature on conductivity.

[0125] The specific process of conductivity sensitivity determination is as follows:

[0126] Add different concentrations of conductivity concentrate into the water tank, and perform fixed conductivity measurement processes in sequence to complete the conductivity sensitivity measurement;

[0127] When the sensor to be calibrated is a temperature sensor, the calibration mode includes forward temperature measurement and reverse temperature measurement;

[0128] The temperature measurement range is relatively wide, -30-100℃. It is difficult to determine the limit values ​​of these temperatures using conventional methods. The high and low temperature test chamber used for experiments can meet the existing temperature requirements, and the stable temperature changes can meet the experimental requirements. The high and low temperature test chamber is equipped with an interactive touch screen control panel, pressure gauge, heat dissipation window, liquid level gauge, liquid filling port, circulating liquid inlet, and circulating liquid outlet. The specific process is as follows:

[0129] The specific process of the temperature forward determination is as follows:

[0130] The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the position value of the test chamber is set to 100°C. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature rise process and observe the temperature indication when the temperature reaches the maximum value, and observe the accuracy of the calibrated temperature sensor;

[0131] The specific process of the temperature reverse determination is as follows:

[0132] The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the test chamber position value is set to -30℃. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature drop process, observe the temperature reading of the temperature sensor when the temperature reaches the minimum value, and observe the accuracy of the calibrated temperature sensor.

[0133] The control unit (PLC) in the terminal box of the present application can collect the data output by the sensor, summarize and calculate the output data, and calculate its repeatability error, zero drift, and accuracy performance respectively.

[0134] The specific calculation principle is as follows:

[0135] The following is the calculation principle of repeatability error, accuracy performance and zero drift in PLC summary calculation data.

[0136] Repeatability error calculation principle:

[0137] 1. Repeatability error measurement requirements: Repeatability error ≤ ±0.5%.

[0138] 2. Measurement method

[0139] Repeatability usually refers to the consistency of the results obtained from multiple measurements of the same measured quantity under the same conditions. It is an indicator of the reliability and stability of the measurement results and is one of the prerequisites for ensuring the accuracy and reliability of the measurement results.

[0140] Repeatability can be calculated in many ways, one of the common methods is to calculate the standard deviation. Specifically, assuming we have a measurement sequence x1, x2, … xn, we can use the following formula to calculate repeatability:

[0141] First, we need to calculate the average of each measurement using the formula:

[0142] Average value = (x1+x2+..+xn) / n

[0143] We then need to calculate the square of the difference between each measurement and the mean, using the formula:

[0144] (x1-average)^2,(x2-average)^2,..(xn-average)^2

[0145] Next, we need to calculate the average of the squares of these differences, which is calculated as follows: Average squared difference = ((x1-average)^2 + (x2-average)^2 + .. + (xn-average)^2) / n Finally, we need to calculate the standard deviation, which is calculated as follows:

[0146] Standard deviation = square root of mean deviation

[0147] The smaller the standard deviation, the better the repeatability of the measurement results, that is, the higher the reliability and stability of the measurement results. Conversely, the larger the standard deviation, the worse the repeatability of the measurement results, that is, the lower the reliability and stability of the measurement results.

[0148] 3. Specific methods

[0149] Measure ten sets of physical quantities and find the average value, then substitute it into the formula and find the repeatability error

[0150] Accuracy performance calculation principle:

[0151] 1. Accuracy measurement requirements: Accuracy performance ≤ ± 0.5% FS;

[0152] 2. Measurement method

[0153] Formula: δ=ΔYmax / Y×100%;

[0154] Parameter explanation:

[0155] δ: represents linearity; ΔYmax: represents the maximum deviation between the sensor calibration curve and the ideal linear relationship; Y: represents full-scale output;

[0156] Calculation method: Linearity is obtained by calculating the maximum difference between the sensor calibration curve and the ideal linear relationship.

[0157] Example: Assume that the full-scale output of a temperature sensor is 100°C, and during the calibration process, it is found that the maximum deviation between the calibration curve and the ideal linear relationship is 2°C. According to the formula, the linearity of the temperature sensor is: δ = 2°C / 100°C × 100% = 2%.

[0158] 3. Specific methods

[0159] Taking the measurement value of E+H instrument as the ideal linear relationship, measure the maximum absolute value of the instrument under test and the entire range of E+H instrument and divide it by the entire range.

[0160] δ=|measured value-standard value|max / range

[0161] In this precision performance calculation principle, E+H instrument refers to a standard instrument that is considered to have high accuracy and reliability (usually a sensor or measuring device widely used in the industrial field), which is used as a reference standard for comparison with the instrument to be tested. Specifically, E+H is a brand of the German E+H company (Endress+Hauser), which focuses on providing high-precision industrial automation measuring instruments, including temperature sensors, pressure sensors, flow meters, etc. E+H instruments usually have good linearity and high accuracy, so they are used as standard equipment and serve as an ideal reference during calibration and measurement to ensure the accuracy of the measurement results of the equipment to be tested.

[0162] In this context, the "E+H instrument measurement value" mentioned in the formula is the standard value of the ideal linear relationship. The output of the instrument to be tested is compared with the measurement value of the E+H instrument to calculate its linearity deviation.

[0163] Zero drift calculation principle:

[0164] 1. Zero drift and temperature drift measurement requirements: zero drift and temperature drift ≤ ± 0.1%;

[0165] 2. Measurement method

[0166] Zero drift: When there is no input (or the input value remains unchanged), the sensor's output deviates from zero (or the original indicated value) at intervals.

[0167] Where ΔY o Maximum zero point deviation (or corresponding deviation);

[0168] Zero drift or sensitivity drift can be divided into time drift and temperature drift (temperature drift).

[0169] Time drift is the slow change of zero point or sensitivity over time under specified conditions.

[0170] Temperature drift is the degree of zero point or sensitivity drift caused by changes in ambient temperature. Generally, it is expressed as the percentage of the maximum output deviation to the full scale when the temperature changes by 1°C.

[0171] Δ max is the maximum output deviation; ΔT is the temperature variation range.

[0172] 3. Specific methods

[0173] PS: Pressure drift measurement: After the equipment pressure runs stably, measure the pressure value within 10 minutes and compare it with the result of E+H measurement to measure the maximum value Δ max， Then zero drift = Δ max / Y FS ;

[0174] FS: Temperature drift measurement: Calculate the maximum difference Δ between the measured value and the standard value during a temperature rise of 1°C max ,

[0175] Then temperature drift = Δ max / Y FS .

[0176] This test platform realizes on-site verification and calibration of sensors through comprehensive measurement units and efficient test architecture, avoiding the disassembly and return process in traditional methods, significantly improving efficiency and reducing economic costs. The platform can accurately simulate a variety of actual environmental factors such as liquid level, flow, pressure, temperature and conductivity, and cover the temperature range of -30℃ to 100℃, so as to comprehensively evaluate the performance of different sensors under various working conditions. In addition, the platform supports comprehensive testing and horizontal comparison of multiple performance indicators of pressure, temperature, flow, liquid level and conductivity sensors, filling the gap that a single test platform cannot simultaneously verify multi-source heterogeneous sensors. In order to promote the advancement of domestic technology, the platform has also designed verification functions for domestic sensors, focusing on quantitative evaluation of static stability, dynamic response, anti-interference ability and accuracy performance, and providing reliable data support. The platform adopts an integrated design, integrates the measurement functions of liquid level, pressure and conductivity, and is equipped with a built-in heat exchange system, which can simulate the impact of temperature differences on sensor performance and reduce the dispersion and complexity of test equipment. In addition, through precise verification, the platform effectively reduces the risk of system misjudgment, refusal or malfunction due to sensor errors, ensuring the safety and reliability of the valve cooling system. The platform is widely used in multiple industrial fields such as electricity, chemical industry, and petroleum, providing efficient and reliable sensor verification and optimization support for different application scenarios.

[0177] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve cooling sensor comprehensive test platform, characterized in that: include: Water tank, circulating booster pump, pressure sensor calibration branch, conductivity sensor calibration branch, liquid level sensor calibration branch and control unit; The water tank is connected to one end of the main pipeline, the main pipeline is provided with the circulating booster pump and the pressure gauge, the other end of the main pipeline is connected to the pressure sensor verification branch, the conductivity sensor verification branch and one end of the liquid level sensor verification branch arranged in parallel, and the other ends of the pressure sensor verification branch and the conductivity sensor verification branch are connected to the water tank through a return pipe; The control unit is connected to the circulating booster pump, the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch, and is used to control the circulating booster pump, the pressure sensor verification branch, the conductivity sensor verification branch and the liquid level sensor verification branch to work and obtain and display the verification data results.

2. The valve cooling sensor comprehensive test platform according to claim 1 is characterized in that: The pressure sensor verification branch includes a pressure sensor verification pipeline, a calibrated pressure sensor and a first electric switch valve. One end of the pressure sensor verification pipeline is connected to the water distribution pipe, and the other end is connected to the return pipe. The first electric switch valve, the calibrated pressure sensor and the interface of the pressure sensor to be verified are arranged in series on the pressure sensor verification pipeline. The first electric switch valve is arranged on one end of the pressure sensor verification pipeline connected to the water distribution pipe; The conductivity sensor verification branch includes a conductivity sensor verification pipeline, a calibrated conductivity sensor and a second electric switch valve. One end of the conductivity sensor verification pipeline is connected to the water distribution pipe, and the other end is connected to the return pipe. The second electric switch valve, the calibrated conductivity sensor and the conductivity sensor interface to be verified are arranged in series on the conductivity sensor verification pipeline. The second electric switch valve is arranged on one end of the conductivity sensor verification pipeline connected to the water distribution pipe. The liquid level sensor verification branch includes a liquid level sensor verification pipeline, a calibrated liquid level sensor, a liquid level tube and a third electric switch valve. One end of the liquid level sensor verification pipeline and one end of the water distribution pipe are connected to one end of the main pipeline through a three-way joint. The third electric switch valve is arranged on the liquid level sensor verification pipeline. The other end of the liquid level sensor verification pipeline is connected to one end of two liquid level tubes arranged in parallel, wherein the calibrated liquid level sensor is installed on the upper end of one of the liquid level tubes, and an interface for the liquid level sensor to be verified is arranged on the upper end of the other liquid level tube.

3. The valve cooling sensor comprehensive test platform according to claim 2 is characterized by: The liquid level sensor verification branch also includes a visual liquid level tube; the visual liquid level tube is arranged in parallel with the liquid level tube; and an air release valve is provided on the upper end connecting pipe of the two liquid level tubes.

4. The valve cooling sensor comprehensive test platform according to any one of claims 1 to 3, characterized in that: It also includes a high and low temperature test box, which is connected to the water tank. A fifth manual valve and a sixth manual valve are arranged between the high and low temperature test box and the water tank.

5. The valve cooling sensor comprehensive test platform according to claim 4 is characterized in that: The high and low temperature test box is also provided with interfaces for calibrated temperature sensors and temperature sensors to be calibrated.

6. The valve cooling sensor comprehensive test platform according to claim 5 is characterized in that: It also includes a liquid level sensor drainage pipeline connected to the liquid level sensor verification pipeline, a fourth electric switch valve is arranged on the liquid level sensor drainage pipeline, and a first manual valve is arranged at the end of the liquid level sensor drainage pipeline.

7. The valve cooling sensor comprehensive test platform according to claim 6 is characterized by: It also includes a water replenishment branch, which includes a water replenishment pipe and a self-priming pump; One end of the water supply pipe is connected to the drainage pipeline of the liquid level sensor, and the other end is connected to the return pipe. The self-priming pump is arranged on the water supply pipe.

8. The valve cooling sensor comprehensive test platform according to claim 7 is characterized in that: It also includes reserved area branches; The reserved area branch includes a first reserved pipe and a second reserved pipe, one end of the first reserved pipe is connected to the main pipeline, and the other end is provided with a second manual valve, one end of the second reserved pipe is connected to the return pipe, and the other end is provided with a third manual valve, and the return pipe is provided with a fourth manual valve.

9. A testing method using the valve cooling sensor comprehensive testing platform according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Install the sensor to be calibrated on the corresponding sensor calibration branch; Step 2: The control unit controls the corresponding sensor verification branch to open and work, and the control unit controls the circulating booster pump to work according to the set verification mode, so that the coolant in the water tank enters the corresponding sensor verification branch through the main pipeline; Step 3: The control unit obtains the verification data results in real time and displays them.

10. The testing method according to claim 9, characterized in that: The following steps are also included: The sensor to be calibrated is one or more of a pressure sensor, a conductivity sensor, a liquid level sensor and a temperature sensor; When the sensor to be calibrated is a pressure sensor, the calibration mode includes forward pressure measurement, reverse pressure measurement, and pressure measurement affected by temperature; The specific process of the pressure forward measurement is as follows: Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor verification pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, gradually increase the inverter output frequency of the circulation booster pump according to the set increment value to gradually increase the pressure of the coolant in the main pipeline until the coolant pressure in the main pipeline reaches the maximum value. The control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor verification pipeline and the pressure sensor to be verified installed in the interface of the pressure sensor to be verified in real time, obtains the verification data result according to the pressure value and displays it; The specific process of the pressure reverse measurement is as follows: Open the seventh manual valve on the main pipeline, the fourth manual valve on the return pipe and the first electric switch valve on the pressure sensor verification pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline, adjust the inverter output frequency of the circulation booster pump to the maximum, so that the coolant pressure value in the main pipeline reaches the maximum value, after the pressure value in the main pipeline is stable, gradually reduce the inverter output frequency of the circulation booster pump according to the set increase and decrease value to gradually reduce the pressure of the coolant in the main pipeline until the coolant pressure value in the main pipeline returns to zero, and the control unit obtains the pressure values ​​of the aligned pressure sensor in the pressure sensor verification pipeline and the pressure sensor to be verified installed in the interface of the pressure sensor to be verified in real time, obtains the verification data result according to the pressure value and displays it; The specific process of measuring the influence of temperature on pressure is as follows: Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding pressure forward measurement or pressure reverse measurement process is performed to complete the pressure temperature effect measurement; When the sensor to be calibrated is a liquid level sensor, the calibration mode includes forward liquid level measurement, reverse liquid level measurement, and liquid level measurement affected by temperature; The specific process of the liquid level forward measurement is as follows: Open the seventh manual valve on the main pipeline, the eighth manual valve and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump and read the pressure value in the main pipeline through the pressure gauge on the main pipeline. After the pressure value in the main pipeline is stable, observe the liquid level of the visual liquid level tube and adjust the opening ratio of the third electric regulating valve according to the set increment value so that the liquid level in the liquid level tube gradually increases until the liquid level in the liquid level tube reaches the maximum value. The control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level tube and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data result according to the liquid level value and displays it; The specific process of reverse liquid level determination is as follows: Open the seventh manual valve on the main pipeline, the eighth manual valve and the third electric switch valve on the liquid level sensor verification pipeline, close the fourth electric switch valve on the liquid level sensor drainage pipeline, start the circulation booster pump to make the liquid level in the liquid level pipe reach the maximum value, close the circulation booster pump and the third electric switch valve on the liquid level sensor verification pipeline, open the fourth electric switch valve and the self-priming pump on the liquid level sensor drainage pipeline, observe the liquid level of the visible liquid level pipe and adjust the eighth manual valve on the liquid level sensor verification pipeline according to the set decrement value, so that the liquid level in the liquid level pipe gradually decreases until the liquid level in the liquid level pipe reaches the minimum value, and the control unit obtains the liquid level values ​​of the aligned liquid level sensor in the liquid level pipe and the liquid level sensor to be verified installed in the interface of the liquid level sensor to be verified in real time, obtains the verification data results according to the liquid level values ​​and displays them; The specific process of measuring the liquid level affected by temperature is as follows: Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the corresponding liquid level forward measurement or liquid level reverse measurement process is performed to complete the measurement of the liquid level affected by temperature; When the sensor to be calibrated is a conductivity sensor, the calibration mode includes fixed conductivity measurement, temperature effect on conductivity measurement, and conductivity sensitivity measurement; The specific process of the fixed conductivity determination is as follows: Open the seventh manual valve on the main pipe, the fourth manual valve on the return pipe, and the second electric switch valve on the conductivity sensor verification pipe, start the circulation booster pump, and read the pressure value in the main pipe through the pressure gauge on the main pipe. After the pressure value in the main pipe stabilizes, the control unit obtains the conductivity values ​​of the aligned conductivity sensor in the conductivity sensor verification pipe and the conductivity sensor to be verified installed in the interface of the conductivity sensor to be verified in real time, obtains the verification data results according to the conductivity values, and displays them; The specific process of measuring the effect of temperature on conductivity is as follows: Open the high and low temperature test box, the fifth manual valve and the sixth manual valve between the high and low temperature test box and the water tank, so that the coolant in the high and low temperature test box and the water tank circulates to adjust the temperature of the coolant in the water tank to the set temperature. When the temperature of the coolant in the water tank reaches the set temperature, the fixed conductivity measurement process is performed to complete the measurement of the influence of temperature on conductivity. The specific process of conductivity sensitivity determination is as follows: Add different concentrations of conductivity concentrate into the water tank, and perform fixed conductivity measurement processes in sequence to complete the conductivity sensitivity measurement; When the sensor to be calibrated is a temperature sensor, the calibration mode includes forward temperature measurement and reverse temperature measurement; The specific process of the temperature forward determination is as follows: The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the position value of the test chamber is set to 100°C. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature rise process and observe the temperature indication when the temperature reaches the maximum value, and observe the accuracy of the calibrated temperature sensor; The specific process of the temperature reverse determination is as follows: The calibrated temperature sensor and the temperature sensor to be calibrated are installed in a high and low temperature test chamber and the test chamber position value is set to -30℃. The control unit obtains the temperature values ​​of the calibrated temperature sensor and the temperature sensor to be calibrated installed in the interface of the temperature sensor to be calibrated in real time, obtains the calibration data results according to the temperature values ​​and displays them, so as to observe the temperature change trend and overall stability during the temperature drop process, observe the temperature reading of the temperature sensor when the temperature reaches the minimum value, and observe the accuracy of the calibrated temperature sensor.

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