Device for long-period test of water quality on-line monitoring equipment

Abstract

The invention relates to the field of water quality monitoring equipment, in particular to a long-period testing device for water quality on-line monitoring equipment, which comprises a high-pressure testing unit and a low-pressure testing unit, the high-pressure testing unit is used for forming a high-pressure testing system, and the low-pressure testing unit is used for forming a low-pressure testing system. The high-voltage test unit and the low-voltage test unit are connected in parallel; the high-pressure test system and the low-pressure test systems are closed systems, the high-pressure test system comprises a plurality of loops and can simultaneously monitor various types of water quality monitoring equipment, and the plurality of low-pressure test systems are connected in parallel and simulate different flow parameters of various types of low-pressure water quality monitoring equipment. The device has the effect of carrying out long-period function and performance testing on the water quality online monitoring equipment.

Description

Technical Field

[0001] The present application relates to the field of water quality monitoring equipment, and in particular to a device for long-term testing of online water quality monitoring equipment. Background Art

[0002] Water quality monitoring is a way to monitor and measure the types of pollutants in water bodies, the concentrations of various pollutants and their changing trends, and to evaluate the water quality. The scope of water quality monitoring is very wide, including but not limited to unpolluted and polluted natural water, as well as various industrial drainage. The main monitoring items can be divided into two categories: one is the comprehensive indicators reflecting the water quality, such as temperature, chromaticity, turbidity, pH value, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand and biochemical oxygen demand; the other is some toxic substances, such as phenol, cyanide, arsenic, lead, chromium, cadmium, mercury and organic pesticides. In order to objectively evaluate the water quality, in addition to the above monitoring items, it is sometimes necessary to measure the flow rate and flow. Water quality monitoring is also widely used in the fields of energy, electricity, sewage treatment, etc. Through water quality monitoring, the liquid medium is analyzed, mainly reflecting the current liquid medium's dissolved oxygen, dissolved hydrogen, ion concentration, conductivity, pH and other water chemical parameters, which are used to objectively evaluate the water quality and support operators to make water quality status development predictions or fault diagnosis.

[0003] Water chemistry monitoring usually adopts two methods: manual sampling and analysis and online monitoring. Compared with manual sampling and analysis, online monitoring has the advantages of real-time measurement, high reliability, and can effectively reduce the labor intensity and radiation dose level of chemical and operating personnel. It is the future development trend of water chemistry monitoring technology. At present, based on the "online" monitoring characteristics and the use scenarios of online monitoring instruments, most of the online water chemistry monitoring instruments are long-cycle working instruments, and their stability, reliability and accuracy of long-cycle working status need to be verified through engineering tests. Therefore, it is necessary to conduct long-term testing and maintenance of online water quality monitoring equipment. Summary of the invention

[0004] In order to perform long-term function and performance tests on online water quality monitoring equipment, the present application provides a device for long-term testing of online water quality monitoring equipment.

[0005] The present application provides a device for long-term testing of online water quality monitoring equipment, which adopts the following technical solution:

[0006] A device for long-term testing of water quality online monitoring equipment, comprising:

[0007] A high-voltage test system, comprising a high-voltage test unit, wherein the high-voltage test unit comprises at least one chemical detection module;

[0008] A low-voltage test system comprises a low-voltage test unit, at least one of which is provided, and the low-voltage test unit monitors the low-voltage equipment to be tested;

[0009] The high voltage test unit and the low voltage test unit are connected in parallel.

[0010] By adopting the above technical scheme, the high-pressure test system is used to measure the function and performance of the equipment to be tested under high-pressure conditions. The high-pressure test unit is a part of the high-pressure test system. When in use, the high-pressure experimental unit is the test part. Each chemical detection module can test a type of equipment to be monitored. The high-pressure experimental unit is provided with at least one chemical detection module, and it can have the ability to simultaneously test various types of equipment to be monitored according to any number of chemical detection modules; the low-pressure test system is used to measure the function and performance of low-pressure equipment to be tested under low-pressure conditions. When in use, the low-pressure test system is used to simulate different flow parameters of various low-pressure equipment to be tested; the high-pressure test unit and the low-pressure test unit are arranged in parallel to achieve the purpose of simultaneously monitoring the high-pressure equipment to be tested and the low-pressure water quality detection equipment, thereby conducting long-term function and performance tests on the online water quality monitoring equipment.

[0011] Preferably, the high-pressure test system is a closed system, and the high-pressure test unit includes a high-pressure pump, a heating belt, a chemical monitoring module, and a back-pressure valve connected in series in sequence. The chemical monitoring modules are provided in plurality, and the chemical monitoring modules monitor the high-pressure equipment to be tested.

[0012] By adopting the above technical scheme, the high-pressure test unit makes the high-pressure test system a complete closed system. The high-pressure pump pressurizes the test medium. The back-pressure valve and the high-pressure pump are used together to make the test medium pressure the same as the prototype. The heating belt heats the test medium to make the test medium and the prototype temperature the same, thereby achieving the effects of prototype pressure simulation and prototype temperature simulation, making the monitoring result more accurate; each chemical monitoring module monitors one type of equipment to be monitored, and the test medium flows through at least one chemical monitoring module, that is, at least one type of equipment to be monitored is monitored, and the operation is performed simultaneously, saving time and effort.

[0013] Preferably, the low-pressure test unit comprises a circulation pump and a low-pressure monitoring component;

[0014] The low-voltage monitoring component is used to monitor the low-voltage equipment to be tested, and the low-voltage equipment to be tested includes a plurality of chemical meters arranged in parallel.

[0015] By adopting the above technical solution, the chemical instrument is a low-pressure device to be tested, and the circulation pump is used to provide power for the test medium, so that the low-pressure measuring unit forms a complete passage.

[0016] Preferably, it further comprises a water purification unit and a water preparation tank, wherein the water purification unit and the water preparation tank are connected in series to form a main channel;

[0017] The high-voltage test unit is a first branch channel, and the main channel and the first branch channel constitute the high-voltage test system;

[0018] The low-pressure test unit is a second branch channel, and the main channel and the second branch channel constitute the low-pressure test system.

[0019] By adopting the above technical scheme, the test medium flows out from the preparation water tank, passes through the high-pressure test unit and / or the low-pressure test unit, flows through the water purification unit and flows back to the preparation water tank, forming a closed-loop circulation system, achieving the purpose of continuous operation and continuous measurement, and realizing long-cycle testing; when the test medium flows through the chemical instrument, since the chemical instrument contains chemical substances, the test medium will bring out the chemical substances in the chemical instrument after flowing out of the chemical instrument. At this time, the test medium contains chemical substances. The test medium containing chemical substances is purified by the water purification unit and then flows into the preparation water tank, so as to prevent the test medium containing chemical substances from contaminating the test medium in the preparation water tank.

[0020] Preferably, the chemical monitoring module includes a differential pressure measuring device, the high-pressure equipment to be tested includes a chemical monitoring device, and the differential pressure measuring device uses the inlet and outlet of the chemical monitoring device as a measuring point to monitor the differential pressure before and after the test medium flows through the chemical monitoring device.

[0021] By adopting the above technical solution, the test medium is pressurized by a high-pressure pump, heated by a heating tape, and flows through two test points to obtain a pressure difference at both ends of the chemical detection equipment. The opening of the back pressure valve can be adjusted according to the pressure difference to adjust the pressure in the flow path of the high-pressure test unit.

[0022] Preferably, the chemical meter comprises a first chemical meter and a second chemical meter, and the first chemical meter, the water purification unit, and the preparation water tank form a closed-loop system;

[0023] The test medium enters the second chemical instrument after flow adjustment, and the test medium passing through the second chemical instrument is discharged into the air.

[0024] By adopting the above technical solution, in the closed-loop system, the flow rate of the test medium is the same as that of the prototype, and the low-pressure equipment to be tested is monitored; the second chemical instrument is intermittent sampling measurement, and since the flow rate required by the second chemical instrument is small, the test medium after the intermittent sampling measurement is discharged into the air.

[0025] Preferably, a first control valve is provided at the inlet of the chemical monitoring equipment, a first branch is provided between two adjacent chemical monitoring modules, and a second control valve is installed on the first branch;

[0026] The back pressure valve is arranged on the flow path between the water purification unit and the chemical monitoring module.

[0027] By adopting the above technical solution, the first control valve is used to control whether the test medium flows through the chemical detection equipment. If the first control valve is closed, the second control valve is opened to allow the test medium to flow to the next first control valve, and then the next first control valve controls whether the test medium flows through the next chemical detection equipment. After the test medium passes through the back pressure valve back pressure, the flow of the test medium is realized to achieve the monitoring effect.

[0028] Preferably, a pressure measuring device is provided between the high-pressure pump and the heating belt;

[0029] A temperature measuring device is provided on the flow path between the heating belt and the chemical monitoring module.

[0030] By adopting the above technical solution, the opening of the back pressure valve is adjusted according to the value measured by the pressure measuring device, and the power of the heating belt is adjusted according to the value measured by the temperature measuring device.

[0031] Preferably, the low-pressure measurement unit further comprises a third control valve, and the third control valve is connected in parallel with the first chemical instrument;

[0032] A flow measurement device is provided at the outlet of the first chemical instrument, and the opening of the third control valve is adjusted according to the value measured by the flow measurement device.

[0033] By adopting the above technical solution, the branch flow resistance of the first chemical instrument is large. Therefore, when the opening degree of the third control valve decreases, the flow rate of the test medium flowing through the first chemical instrument increases.

[0034] Preferably, a fourth control valve is provided at the inlet of the second chemical instrument.

[0035] By adopting the above technical solution, the fourth control valve controls the amount of the test medium entering the second chemical instrument.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. The high-pressure test unit makes the high-pressure test system a complete closed system. The high-pressure pump pressurizes the test medium. The back-pressure valve and the high-pressure pump are used together to make the test medium pressure the same as the prototype. The heating belt heats the test medium to make the test medium and the prototype temperature the same, thereby achieving the effects of prototype pressure simulation and prototype temperature simulation, making the monitoring results more accurate; each chemical monitoring module monitors one type of equipment to be monitored. The test medium flows through at least one chemical monitoring module, which means that at least one type of equipment to be monitored is monitored, and the operation is performed simultaneously, saving time and effort.

[0038] 2. The test medium flows out of the preparation water tank, passes through the high-pressure test unit and / or the low-pressure test unit, flows through the water purification unit and then flows back to the preparation water tank, forming a closed-loop circulation system to achieve the purpose of continuous operation and continuous measurement, and realize long-term testing; when the test medium flows through the chemical instrument, since the chemical instrument contains chemical substances, the test medium will bring out the chemical substances in the chemical instrument after flowing out of the chemical instrument. At this time, the test medium contains chemical substances. The test medium containing chemical substances is purified by the water purification unit and then flows into the preparation water tank to prevent the test medium containing chemical substances from contaminating the test medium in the preparation water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the device used for long-term testing of online water quality monitoring equipment in an embodiment of the present application.

[0040] Explanation of the accompanying drawings: 1. High-pressure test system; 11. High-pressure test unit; 111. High-pressure pump; 112. Heating belt; 113. Chemical monitoring module; 1131. Chemical monitoring equipment; 1132. Pressure difference measuring device; 1133. First control valve; 1134. Second control valve; 114. Back pressure valve; 115. Pressure measuring equipment; 116. Temperature measuring equipment; 2. Low-pressure test system; 21. Low-pressure test unit; 211. Circulation pump; 212. Chemical instrument; 2121. First chemical instrument; 2122. Second chemical instrument; 213. Third control valve; 214. Flow measurement device; 215. Fourth control valve; 3. Water purification unit; 4. Preparation water tank. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 This application is described in further detail.

[0042] The present application embodiment discloses a device for long-term testing of water quality online monitoring equipment. Figure 1The device for long-term testing of online water quality monitoring equipment includes a main channel, a first branch channel and a second branch channel; the main channel and the first branch channel constitute a high-pressure test system 1, and the main channel and the second branch channel constitute a low-pressure test system 2. Among them, the main channel includes a water purification unit 3 and a preparation water tank 4, the first branch channel is a high-pressure test unit 11, and the second branch channel is a low-pressure test unit 21, and the high-pressure test unit 11 is connected in parallel with the low-pressure test unit 21. The water purification unit 3 and the preparation water tank 4 are connected in series, and the preparation water tank 4 is used to store liquid test media. The test medium flows out of the preparation water tank 4, passes through the high-pressure test unit and / or the low-pressure test unit, flows through the water purification unit 3 and flows back to the preparation water tank 4, forming a closed-loop circulation system, achieving the purpose of continuous operation and continuous measurement, and realizing long-term testing; the test medium flows out through the main channel, flows through the first branch channel and / or the second branch channel, and then needs to flow into the water purification unit 3 to purify the test medium, and the purified test medium flows back to the preparation water tank 4 to avoid contamination of the test medium in the preparation water tank 4.

[0043] The high-pressure test system 1 is used to measure the function and performance of the equipment to be tested under high-pressure conditions. When in use, the high-pressure test unit is the test part; the high-pressure test unit 11 includes at least one chemical detection module, and at least one low-pressure test unit 21 is set. Each chemical detection module can test a type of equipment to be monitored. The high-pressure test unit is set with at least one chemical detection module. When in use, various types of equipment to be monitored can be tested simultaneously according to any number of chemical detection modules; the low-pressure test system 2 is used to measure the function and performance of low-pressure equipment to be tested under low-pressure conditions. When in use, the low-pressure test system 2 can realize the simulation of different flow parameters of various low-pressure equipment to be tested. In a preferred embodiment, the high-pressure test unit 11 and the low-pressure test unit 21 are set in parallel. When monitoring the equipment to be tested, the high-pressure test unit 11 and the low-pressure test unit 21 work together to achieve the function of simultaneously monitoring the high-pressure equipment to be tested and the low-pressure water quality detection equipment, thereby performing a long-term function and performance test on the online water quality monitoring equipment.

[0044] The high-pressure test system 1 is a closed system. The high-pressure test unit 11 includes a high-pressure pump 111, a heating belt 112, a chemical monitoring module 113, and a back pressure valve 114 which are sequentially arranged in series. Two adjacent devices are connected through a flow path. The high-pressure pump 111 pressurizes the test medium and adjusts the pressure inside the high-pressure test unit 11. The opening of the back pressure valve 114 is adjusted by the pressure of the test medium adjusted by the high-pressure pump 111. After the opening of the back pressure valve 114 is adjusted, the pressure inside the high-pressure test unit 11 also changes with the opening of the back pressure valve 114. The back pressure valve 114 is used in conjunction with the high-pressure pump 111 to make the pressure of the test medium the same as that of the prototype. The heating belt 112 heats the test medium to make the test medium and the prototype temperature the same, thereby achieving the effect of prototype pressure simulation and prototype temperature simulation, making the monitoring result more accurate.

[0045] In an optional embodiment, the power of the heating belt 112 can be adjusted. When rapid heating or heating the test medium to a higher temperature is required, the heating belt 112 can be adjusted to a high power. When the temperature of the test medium needs to be slowly heated or the test medium temperature needs to be maintained or the test medium needs to be heated to a lower temperature, the heating belt 112 can be adjusted to a low power. In an optional embodiment, an instrumentation system is also included. The instrumentation system can be used to control the power of the heating belt 112, the opening of the back pressure valve 114, etc. A pressure measuring device 115 is provided on the flow path between the high-pressure pump 111 and the heating belt 112. The pressure measuring device 115 displays the real-time pressure value on the flow path of the high-pressure test unit 11. The actual pressure signal measured by the pressure measuring device 115 will be fed back to the instrumentation system, and the instrumentation system will guide the opening adjustment of the electric back pressure valve 114 to make the test medium pressure the same as the prototype.

[0046] In an optional embodiment, a temperature measuring device 116 is provided on the flow path between the heating belt 112 and the chemical monitoring module 113, and the temperature measuring device is used to monitor the temperature of the test medium after being heated by the heating belt 112. The temperature data monitored by the temperature measuring device 116 will be fed back to the instrumentation and control system, and the instrumentation and control system will guide the power adjustment of the heating belt 112. In an optional embodiment, a first flow monitoring device is also provided on the flow path between the back pressure valve 114 and the water purification unit 3, and the first flow monitoring device is used to monitor the flow of the test medium in the high-pressure test unit 11. The flow data measured by the first flow monitoring device is fed back to the instrumentation and control system, and the instrumentation and control system controls the flow output of the high-pressure pump 111.

[0047] The chemical monitoring module 113 includes at least one differential pressure measuring device 1132. The high-pressure test equipment includes a chemical monitoring device 1131. The differential pressure measuring device 1132 is used to measure the differential pressure at both ends of the chemical monitoring device 1131, that is, the differential pressure measuring device 1132 uses the inlet and outlet of the chemical monitoring device 1131 as the measuring point to monitor the differential pressure before and after the test medium flows through the chemical monitoring device 1131. During the monitoring process, the test medium is pressurized by the high-pressure pump 111, flows through two test points to obtain the differential pressure at both ends of the chemical detection equipment, and the differential pressure data is fed back to the instrumentation and control system. The instrumentation and control system can adjust the opening of the back pressure valve 114 according to the differential pressure, thereby achieving the effect of adjusting the pressure in the flow path of the high-pressure test unit 11. A first control valve 1133 is provided at the inlet of the chemical monitoring device 1131, and a first branch is provided between two adjacent chemical monitoring modules 113. A second control valve 1134 is installed on the first branch. The first control valve 1133 is used to control whether the test medium flows through the chemical detection equipment. If the first control valve 1133 is closed, the second control valve 1134 is opened to allow the test medium to flow to the next first control valve 1133, and then the next first control valve 1133 controls whether the test medium flows through the next chemical detection equipment.

[0048] In an optional embodiment, three chemical detection devices are provided, and pressure differential measuring devices are installed at both ends of each chemical monitoring device 1131. The chemical monitoring device 1131 includes a first monitoring device, a second monitoring device, and a third monitoring device. The first monitoring device is installed at both ends with a first pressure differential measuring device, the second monitoring device is installed at both ends with a second pressure differential measuring device, and the third monitoring device is installed at both ends with a third pressure differential measuring device. Optionally, the first control valve 1133 is a three-way ball valve, the second control valve 1134 is a ball valve, the first control valve 1133 includes valve A, valve B and valve C, the second control valve 1134 includes valve D and valve F, valve A is provided at the entrance of the first monitoring device and is located between the temperature detection device and the first monitoring device, valve D is installed on the branch between the first detection device and the second monitoring device, valve B is provided at the entrance of the second monitoring device, and valve F is installed on the branch between the second monitoring device and the third monitoring device. Optionally, a first control valve 1133 is also provided on the flow path between the back pressure valve 114 and the third monitoring device, and the first control valve 1133 provided on the flow path between the back pressure valve 114 and the third monitoring device is a G valve.

[0049] The test medium is pressurized by the high-pressure pump 111 from the outlet of the preparation water tank 4, and reaches the A valve after being heated by the heating belt 112. The state of the A valve can be used to select whether the test medium flows through the first monitoring device. If the A valve is connected to the inlet of the first monitoring device, the D valve is closed, and the test medium reaches the B valve after passing through the first monitoring device. If the A valve is connected to the bypass line, the D valve is opened, and the test medium reaches the B valve through the bypass. Similarly, the state of the B valve and the F valve can be used to select whether the test medium flows through the second monitoring device and the third monitoring device. After the test medium comes out of the third monitoring device, it passes through the back pressure valve 114 and the first flow monitoring device and enters the purification unit, and finally flows back to the preparation water tank 4 to form a closed-loop circulation system.

[0050] At least one low-pressure test unit 21 is provided, and the low-pressure test unit 21 monitors the low-pressure device to be tested. The low-pressure test unit 21 includes a circulation pump 211 and a low-pressure monitoring component, and the low-pressure monitoring component is used to monitor the low-pressure device to be tested. In an optional embodiment, the low-pressure device to be tested includes a plurality of chemical instruments 212 arranged in parallel, and the circulation pump 211 is used to provide power for the test medium so that the low-pressure measurement unit forms a complete path. Optionally, when the test medium flows through the chemical instrument 212, since the chemical instrument 212 contains chemical substances, the test medium will take out the chemical substances in the chemical instrument 212 after flowing out of the chemical instrument 212. At this time, the test medium contains chemical substances, and the test medium containing chemical substances is purified by the water purification unit 3, and then flows into the preparation water tank 4 to prevent the test medium containing chemical substances from contaminating the test medium in the preparation water tank 4.

[0051] In an optional embodiment, the chemical instrument 212 includes a first chemical instrument 2121 and a second chemical instrument 2122. The first chemical instrument 2121, the water purification unit 3, and the preparation water tank 4 form a closed-loop system. In the closed-loop system, the flow rate of the test medium is the same as that of the prototype, and the low-pressure test equipment is monitored; the test medium enters the second chemical instrument 2122 after flow adjustment, and the second chemical instrument 2122 is intermittent sampling measurement. Since the flow required by the second chemical instrument 2122 is small, the test medium after intermittent sampling measurement is discharged to the air. The low-pressure measurement unit also includes a third control valve 213, which is connected in parallel with the first chemical instrument 2121. The branch flow resistance of the first chemical instrument 2121 is large. Therefore, when the opening of the third control valve 213 decreases, the flow rate of the test medium flowing through the first chemical instrument 2121 increases. A flow measurement component 214 is provided at the outlet of the first chemical instrument 2121, and the opening of the third control valve 213 is adjusted according to the value measured by the flow measurement component 214. A fourth control valve 215 is provided at the inlet of the second chemical instrument 2122 , and the fourth control valve 215 controls the amount of the test medium entering the second chemical instrument 2122 .

[0052] The implementation principle of the embodiment of the present application is as follows: the high-pressure test system 1 is used to measure the function and performance of the equipment to be tested under high-pressure conditions. The high-pressure test unit 11 is a part of the high-pressure test system 1. When in use, the high-pressure test unit is the test part. Each chemical detection module can test a type of equipment to be monitored. The high-pressure test unit is provided with at least one chemical detection module, and can have the ability to simultaneously test various types of equipment to be monitored according to any number of chemical detection modules; the low-pressure test system 2 is used to measure the function and performance of the low-pressure equipment to be tested under low-pressure conditions. When in use, the low-pressure test system 2 is used to simulate different flow parameters of various low-pressure equipment to be tested; the high-pressure test unit 11 and the low-pressure test unit 21 are arranged in parallel to achieve the purpose of simultaneously monitoring the high-pressure equipment to be tested and the low-pressure water quality detection equipment, thereby performing long-term function and performance testing on the online water quality monitoring equipment.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for long-term testing of online water quality monitoring equipment, characterized in that: include: A high-voltage test system (1) comprises a high-voltage test unit (11), wherein the high-voltage test unit (11) comprises at least one chemical detection module (113); A low-voltage test system (2) comprises a low-voltage test unit (21), at least one low-voltage test unit (21) is provided, and the low-voltage test unit is used to monitor a low-voltage device to be tested; The high-voltage test unit (11) and the low-voltage test unit (21) are connected in parallel.

2. The device for long-term testing of online water quality monitoring equipment according to claim 1, characterized in that: The high-pressure test system (1) is a closed system. The high-pressure test unit (11) comprises a high-pressure pump (111), a heating belt (112), a chemical monitoring module (113) and a back-pressure valve (114) which are sequentially connected in series. The chemical monitoring module (113) is provided in plurality and monitors the high-pressure device to be tested.

3. The device for long-term testing of online water quality monitoring equipment according to claim 1, characterized in that: The low-pressure test unit (21) comprises a circulation pump (211) and a low-pressure monitoring component; The low-voltage monitoring component is used to monitor a low-voltage device to be tested, wherein the low-voltage device to be tested comprises a plurality of chemical meters (212) arranged in parallel.

4. The device for long-term testing of online water quality monitoring equipment according to any one of claims 2-3, characterized in that: It also includes a water purification unit (3) and a water preparation tank (4), wherein the water purification unit (3) and the water preparation tank (4) are connected in series to form a main channel; The high-voltage test unit (11) is a first branch channel, and the main channel and the first branch channel constitute the high-voltage test system (1); The low-pressure test unit (21) is a second branch channel, and the main channel and the second branch channel constitute the low-pressure test system (2).

5. The device for long-term testing of online water quality monitoring equipment according to claim 2, characterized in that: The chemical monitoring module (113) comprises a differential pressure measuring device (1132), the high-voltage device to be tested comprises a chemical monitoring device (1131), and the differential pressure measuring device (1132) uses the inlet and outlet of the chemical monitoring device (1131) as a measuring point to monitor the differential pressure before and after the test medium flows through the chemical monitoring device (1131).

6. The device for long-term testing of online water quality monitoring equipment according to claim 4, characterized in that: The chemical meter (212) comprises a first chemical meter (2121) and a second chemical meter (2122), wherein the first chemical meter (2121), the water purification unit (3), and the prepared water tank (4) form a closed-loop system; The test medium enters the second chemical instrument (2122) after flow adjustment, and the test medium passing through the second chemical instrument (2122) is discharged into the air.

7. The device for long-term testing of online water quality monitoring equipment according to claim 5, characterized in that: A first control valve (1133) is provided at the inlet of the chemical monitoring device (1131), a first branch is provided between two adjacent chemical monitoring modules (113), and a second control valve (1134) is installed on the first branch; The back pressure valve (114) is arranged on the flow path between the water purification unit (3) and the chemical monitoring module (113).

8. The device for long-term testing of online water quality monitoring equipment according to claim 7, characterized in that: A pressure measuring device (115) is also provided between the high-pressure pump (111) and the heating belt (112); A temperature measuring device (116) is also provided on the flow path between the heating belt (112) and the chemical monitoring module (113).

9. The device for long-term testing of online water quality monitoring equipment according to claim 6, characterized in that: The low-pressure measurement unit further comprises a third control valve (213), wherein the third control valve (213) is connected in parallel with the first chemical meter (2121); A flow measurement device (214) is provided at the outlet of the first chemical meter (2121), and the opening degree of the third control valve (213) is adjusted according to the value measured by the flow measurement device (214).

10. The device for long-term testing of online water quality monitoring equipment according to claim 9, characterized in that: A fourth control valve (215) is provided at the inlet of the second chemical instrument (2122).

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