A test system and method for an oxygen monitoring system based on half water and half air

Abstract

The present invention discloses a testing system and method for a semi-water and semi-gas oxygen monitoring system. The oxygen monitoring system comprises an oxygen detection device and an oxygen display device. The inlet and outlet ends of the oxygen detection device are both provided with bellows. The oxygen detection device comprises an oxygen sensor, a main control chip and an antenna. The oxygen display device comprises a wireless radio frequency receiving module and a main microcontroller. The oxygen sensor and the antenna are connected to the main control chip. The antenna is connected to the wireless radio frequency receiving module. The wireless radio frequency receiving module is connected to the main microcontroller. The testing system comprises a pressure tank. The lower part of the pressure tank contains water. The oxygen detection device and the oxygen display device are placed in the water in the pressure tank. The tops of the bellows on both sides extend out of the water. An air inlet, an air outlet, a pressure gauge and an observation window are provided on the top of the pressure tank. The air inlet is connected to one end of an air inlet pipe. The other end of the air inlet pipe is placed in the bellows corresponding to the inlet end of the inlet gas and is connected to the inlet gas inlet joint of the oxygen detection device. An air inlet valve is provided on the air inlet, and an air outlet valve is provided on the air outlet.

Description

Technical Field

[0001] The present invention relates to the field of testing technology, and in particular to a testing system based on a half-water and half-air oxygen monitoring system and a testing method implemented by using the testing system. Background Art

[0002] When divers use closed-circuit submersible breathing apparatus for diving, it is necessary to detect the oxygen partial pressure of the breathing gas in the closed-circuit submersible breathing apparatus in real time to prevent the diver from hypoxia or oxygen poisoning due to abnormal air supply of the respirator, diving time exceeding the plan, drastic changes in the diver's oxygen consumption, etc., so as to ensure the diver's life safety. Based on this, the designer designed an oxygen monitoring system, and the oxygen sensor in the oxygen monitoring system can detect the oxygen concentration in the inhalation pipeline of the closed-circuit submersible breathing apparatus in real time. In order to ensure the detection accuracy of the oxygen sensor in the oxygen monitoring system, it is necessary to simulate the underwater high-pressure environmental pressure to test the detection accuracy of the oxygen sensor under the oxygen partial pressure high-pressure environment. Based on this, the present invention designs a test system and method for an oxygen monitoring system based on half water and half air. Summary of the invention

[0003] In view of the problems and shortcomings of the prior art, the present invention provides a testing system and method for an oxygen monitoring system based on a half-water and half-air system.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a test system for an oxygen monitoring system based on a semi-water and semi-gas system, which is characterized in that the oxygen monitoring system comprises an oxygen detection device and an oxygen display device, the inhaled gas inlet end and the inhaled gas outlet end of the oxygen detection device are both provided with a bellows, the oxygen detection device comprises an oxygen sensor, a main control chip and an antenna, the oxygen display device comprises a wireless radio frequency receiving module and a main microcontroller, the oxygen sensor and the antenna are both electrically connected to the main control chip, the antenna is communicatively connected to the wireless radio frequency receiving module, and the wireless radio frequency receiving module is electrically connected to the main microcontroller;

[0006] The test system includes a test pressure tank, the lower part of which carries water, an oxygen detection device and an oxygen display device are both placed in the water in the test pressure tank, the tops of the bellows on both sides extend out of the water, an air inlet and an air outlet are fixedly provided on the top of the test pressure tank, the air inlet is connected to one end of the air inlet pipe, the other end of the air inlet pipe is placed in the bellows corresponding to the intake gas inflow end and is connected to the intake gas inflow joint of the oxygen detection device, an air inlet valve is provided on the air inlet and located outside the test pressure tank, an air outlet valve is provided on the air outlet and located outside the test pressure tank, the test pressure tank is connected to a pressure gauge displaying its internal pressure, and an observation window facing the display screen of the oxygen display device is provided on the top of the test pressure tank.

[0007] The present invention also provides a test method for an oxygen monitoring system based on half water and half air, which is characterized in that it is implemented using the above-mentioned test system, and the test method includes test method 1:

[0008] The oxygen detection device and oxygen display device connected for startup are calibrated under normal pressure. The oxygen display device records and displays the oxygen partial pressure value transmitted by the oxygen sensor of the oxygen detection device. The outlet valve is closed, the inlet valve is opened, and 23%±1% oxygen standard gas is injected into the test pressure tank to make the pressure in the test pressure tank reach 7 atmospheres. The inlet valve is closed, and the oxygen display device records and displays the oxygen partial pressure measurement value transmitted by the oxygen sensor after the display is stable.

[0009] Calculate the detection error Δe according to formula (1);

[0010] Δe=BB s (1)

[0011] Where B is the measured value of oxygen partial pressure, B s is the theoretical value of oxygen partial pressure corresponding to 7 atmospheres;

[0012] Qualification criteria: Determine whether the detection error Δe is within the accuracy range under high pressure. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=7.

[0013] The present invention also provides a test method for an oxygen monitoring system based on half water and half air, which is characterized in that it is implemented using the above-mentioned test system, and the test method includes test method 2:

[0014] The oxygen detection device and oxygen display device connected for startup are calibrated under normal pressure. The oxygen display device records and displays the oxygen partial pressure value transmitted by the oxygen sensor of the oxygen detection device. The outlet valve is closed, the inlet valve is opened, and standard air is injected into the test pressure tank to make the pressure in the test pressure tank reach 2 atmospheres. The inlet valve is closed, and the oxygen display device records and displays the oxygen partial pressure measurement value transmitted by the oxygen sensor at 2 atmospheres after stabilization;

[0015] Repeat the above operation to make the pressure in the test pressure tank reach 3 atmospheres, 4 atmospheres, 5 atmospheres, 6 atmospheres and 7 atmospheres respectively, close the air inlet valve, and the oxygen display device records the oxygen partial pressure measurement value transmitted by the oxygen sensor at each atmospheric pressure from 3 to 7 atmospheres after the display stabilizes;

[0016] Calculate the detection error Δe corresponding to each atmospheric pressure in 2-7 atmospheric pressures according to formula (1);

[0017] Δe=BB s (1)

[0018] Where B is the oxygen partial pressure measured at various atmospheric pressures from 2 to 7 atmospheres, B s It is the theoretical value of oxygen partial pressure corresponding to each atmospheric pressure from 2 to 7 atmospheres;

[0019] Qualification judgment: Determine whether each of the 6 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

[0020] The present invention also provides a test method for an oxygen monitoring system based on half water and half air, which is characterized in that it is implemented by using the above-mentioned test system, a mass flow meter is provided on the outlet pipe, and a high-precision oxygen analyzer is connected to the outlet pipe. The test method includes test method three:

[0021] 2 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject compressed air into the test pressure tank to make the pressure in the test pressure tank reach 2 atmospheres. Close the inlet valve. After the oxygen display device records and displays the oxygen partial pressure measurement value detected by the oxygen sensor at 2 atmospheres after stabilization, it is used as the first oxygen partial pressure measurement value. Then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe. The oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The pressure measurement value and the first oxygen partial pressure measurement value are calculated to obtain the detection error Δe; then the pressure is reduced to about 150KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 2 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0022] 3 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 3 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The value is compared with the first oxygen partial pressure measurement value to calculate the error to obtain the detection error Δe; then the pressure is reduced to about 200KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 3 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0023] 4 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 4 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The value is compared with the first oxygen partial pressure measurement value to calculate the error to obtain the detection error Δe; then the pressure is reduced to about 300KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 4 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0024] 5 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 5 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 450KPa by decompression, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 5 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0025] 6 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 6 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 550KPa by decompression, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 6 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0026] 7 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 7 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 650KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 7 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe;

[0027] Qualification judgment: Determine whether each of the 12 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

[0028] The positive progress effect of the present invention is that the present invention designs a test system and method based on a half-water and half-air oxygen monitoring system, simulates the underwater high-pressure environmental pressure, and tests the detection accuracy of the oxygen sensor under the oxygen partial pressure high-pressure environment. If the detection error corresponding to the tested oxygen partial pressure is within the corresponding target error range, it indicates that the test result of the oxygen sensor is qualified, and this oxygen monitoring system can be used for underwater operations of divers. If the detection error corresponding to the tested oxygen partial pressure is not within the corresponding target error range, it indicates that the test result of the oxygen sensor is unqualified, and this oxygen monitoring system cannot be used for underwater operations of divers, and needs to be repaired or replaced. The present invention can ensure the measurement accuracy of the oxygen sensor in the oxygen monitoring system to be launched under 1 to 7 atmospheres, and can meet the project requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the test system of the preferred embodiment of the present invention.

[0030] Figure 2 It is a three-dimensional diagram of an oxygen detection device according to a preferred embodiment of the present invention.

[0031] Figure 3-4 Schematic diagram of the internal structure of an oxygen detection device according to a preferred embodiment of the present invention.

[0032] Figure 5 It is a three-dimensional diagram of an oxygen display device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The present embodiment provides a test system for an oxygen monitoring system based on a half-water and half-air system. In order to simulate the pressure of an underwater high-pressure environment and perform a detection accuracy test of the oxygen partial pressure under a high-pressure environment, a half-water and half-air test method is adopted in a pressure tank for a high-pressure test. That is, as the gas in the tank is continuously injected, the oxygen monitoring system is also continuously subjected to the impact test of the high-water pressure environment, thereby realizing the accuracy test of the oxygen sensor in the oxygen monitoring system under a high-pressure environment.

[0035] like Figure 2-5 As shown, the oxygen monitoring system includes an oxygen detection device 200 and an oxygen display device 300 .

[0036] Among them, the oxygen detection device 200 includes a first waterproof shell 1 with a hollow inner cavity, a waterproof baffle 2 is fixed at the middle position of the first waterproof shell 1, the first waterproof shell 1 and the waterproof baffle 2 are integrally formed, the hollow inner cavity of the first waterproof shell 1 is divided into a closed normal pressure chamber 3 without gas exchange and a variable pressure chamber 4 with gas exchange by the waterproof baffle 2, the top of the first waterproof shell 1 and located directly above the closed normal pressure chamber 3 are fixed with a normal pressure chamber sealing ring 5 and a normal pressure chamber upper cover 6 in sequence, a control button 7, an indicator light 8 and a contact 9 are embedded on the normal pressure chamber upper cover 6, a battery 10, a control circuit board 11 and an antenna 12 are fixed in the closed normal pressure chamber 3, and a variable pressure chamber sealing ring 13 is fixed in sequence on the top of the first waterproof shell 1 and located directly above the variable pressure chamber 4 and a transformer chamber upper cover 14, a front side of the transformer chamber upper cover 14 is provided with an intake gas outflow joint 15, the intake gas outflow joint 15 is used to connect the upper intake pipeline of the closed submersible breathing apparatus, a front side of the bottom shell of the first waterproof shell 1 and directly below the transformer chamber 4 is provided with an intake gas inflow joint 16, the intake gas inflow joint 16 is used to connect the lower intake pipeline of the closed submersible breathing apparatus, a mounting plate 17 is fixed in the transformer chamber 4 near the position where the intake gas inflow joint 16 is installed, a differential pressure sensor 18 and an oxygen sensor 19 are fixed on the mounting plate 17, and the control button 7, indicator light 8, contact 9, antenna 12, differential pressure sensor 18, oxygen sensor 19 and battery 10 are all electrically connected to the control circuit board 11.

[0037] Among them, the normal pressure chamber sealing ring 5 adopts a silicone sealing ring, and the normal pressure chamber sealing ring 5 is composed of a normal pressure chamber upper sealing ring matching the top shell edge of the closed normal pressure chamber 3 and a normal pressure chamber lower sealing ring matching the inner wall of the closed normal pressure chamber 3. The normal pressure chamber upper sealing ring and the normal pressure chamber lower sealing ring are integrally formed, the normal pressure chamber lower sealing ring is placed in the closed normal pressure chamber 3 and fits the inner wall of the closed normal pressure chamber 3, and the normal pressure chamber upper sealing ring is fixed on the top of the closed normal pressure chamber 3 and fits the top shell edge of the closed normal pressure chamber 3.

[0038] The transformer chamber sealing ring 13 adopts a silicone sealing ring. The transformer chamber sealing ring 13 is composed of an upper transformer chamber sealing ring that matches the top shell edge of the transformer chamber 4 and a lower transformer chamber sealing ring that matches the inner wall of the transformer chamber 4. The upper transformer chamber sealing ring and the lower transformer chamber sealing ring are integrally formed. The lower transformer chamber sealing ring is placed in the transformer chamber 4 and fits the inner wall of the transformer chamber 4. The upper transformer chamber sealing ring is fixed to the top of the transformer chamber 4 and fits the top shell edge of the transformer chamber 4.

[0039] The oxygen display device 300 includes a second waterproof shell 20 with a hollow inner cavity, and a display 21 is embedded in the second waterproof shell 20. A wireless radio frequency receiving module, a power supply, a power management module and a main microcontroller are arranged in the second waterproof shell 20. The wireless radio frequency receiving module and the display 21 are electrically connected to the main microcontroller, and the power supply is electrically connected to the main microcontroller through the power management module.

[0040] like Figure 1 As shown, the test system includes a test pressure tank 100, the lower part of the test pressure tank 100 carries water 101, the upper part is gas 102, the oxygen detection device 200 and the oxygen display device 300 are placed in the water in the test pressure tank 100, the inhaled gas inlet end and the inhaled gas outflow end of the oxygen detection device 200 are both provided with bellows 201, the tops of the bellows 201 on both sides are extended out of the water surface, the top of the test pressure tank 100 is fixed with an air inlet and an air outlet, and the air inlet is connected to the air inlet pipe 101. 3, the other end of the air inlet pipe 103 is placed in the bellows 201 corresponding to the inlet gas inlet end and connected to the inlet gas inlet joint of the oxygen detection device, an air inlet valve 104 is arranged on the air inlet and outside the test pressure tank 100, an air outlet valve 105 is arranged on the air outlet and outside the test pressure tank 100, the test pressure tank 100 is connected to a pressure gauge 106 displaying its internal pressure, and the top of the test pressure tank 100 is provided with an observation window 107 facing the display screen of the oxygen display device 300.

[0041] The above-mentioned test system is used for testing, and the test method includes test method 1:

[0042] Step 1: Calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure. The oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200. Close the outlet valve 105, open the air inlet valve 104, and inject 23%±1% oxygen standard gas into the test pressure tank 100 to make the pressure in the test pressure tank 100 reach 7 atmospheres. Close the air inlet valve 104, and the oxygen display device 300 records and displays the oxygen partial pressure measurement value detected by the oxygen sensor 19 after stabilization. This oxygen partial pressure measurement value can be observed and recorded through the observation window 107.

[0043] Step 2: Calculate the detection error Δe according to formula (1);

[0044] Δe=BB s (1)

[0045] Where B is the measured value of oxygen partial pressure, B s It is the theoretical value of oxygen partial pressure corresponding to 7 atmospheres.

[0046] Step 3, qualified criterion: determine whether the detection error Δe is within the accuracy range under high pressure. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=7.

[0047] In this method, if the detection error Δe is within the range of ±0.7kPa, the oxygen sensor test is qualified. At this time, the measurement accuracy of the oxygen sensor in the oxygen detection device 200 to be launched into water at 1 to 7 atmospheres can be guaranteed, which can meet the project requirements. If the detection error Δe is not within the range of ±0.7kPa, the oxygen sensor test is unqualified. At this time, the oxygen sensor in the oxygen detection device 200 needs to be repaired or replaced.

[0048] The above-mentioned test system is used for testing, and the test method includes test method 2:

[0049] Step 1: Calibrate the oxygen detection device 200 and the oxygen display device 300 which are turned on and connected at normal pressure. The oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200. Close the outlet valve 105, open the air inlet valve 104, and inject standard air into the test pressure tank 100 to make the pressure in the test pressure tank 100 reach 2 atmospheres. Close the air inlet valve 104, and the oxygen display device 300 records and displays the oxygen partial pressure measurement value detected by the oxygen sensor 19 at 2 atmospheres after stabilization. This oxygen partial pressure measurement value can be observed and recorded through the observation window 107.

[0050] Step 2, repeat the above operation to make the pressure in the test pressure tank 100 reach 3 atmospheres, 4 atmospheres, 5 atmospheres, 6 atmospheres and 7 atmospheres respectively, close the air inlet valve 104, and the oxygen display device 300 records and displays the oxygen partial pressure measurement value transmitted by the oxygen sensor 19 at each atmospheric pressure of 3-7 atmospheres after stabilization, which can be observed and recorded through the observation window 107.

[0051] Step 3: Calculate the detection error Δe corresponding to each atmospheric pressure in 2-7 atmospheric pressures according to formula (1);

[0052] Δe=BB s (1)

[0053] Where B is the oxygen partial pressure measured at various atmospheric pressures from 2 to 7 atmospheres, B s It is the theoretical value of oxygen partial pressure corresponding to each atmospheric pressure from 2 to 7 atmospheres.

[0054] Step 4, qualification judgment: Determine whether each of the 6 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

[0055] In this method, the detection error Δe at 2 atmospheres of pressure is within the range of ±0.2kPa, the detection error Δe at 3 atmospheres of pressure is within the range of ±0.3kPa, the detection error Δe at 4 atmospheres of pressure is within the range of ±0.4kPa, the detection error Δe at 5 atmospheres of pressure is within the range of ±0.5kPa, the detection error Δe at 6 atmospheres of pressure is within the range of ±0.6kPa, and the detection error Δe at 7 atmospheres of pressure is within the range of ±0.7kPa. The oxygen sensor test is qualified, and the measurement accuracy of the oxygen sensor in the oxygen detection device 200 to be launched at 1 to 7 atmospheres can be guaranteed. , which can meet the project requirements, the detection error Δe at 2 atmospheres of pressure is not within the range of ±0.2kPa, the detection error Δe at 3 atmospheres of pressure is not within the range of ±0.3kPa, the detection error Δe at 4 atmospheres of pressure is not within the range of ±0.4kPa, the detection error Δe at 5 atmospheres of pressure is not within the range of ±0.5kPa, the detection error Δe at 6 atmospheres of pressure is not within the range of ±0.6kPa, and the detection error Δe at 7 atmospheres of pressure is not within the range of ±0.7kPa. If one of the conditions is met, the oxygen sensor test fails, and the oxygen sensor in the oxygen detection device 200 needs to be repaired or replaced.

[0056] The above-mentioned test system is used for testing. A mass flow meter is provided on the outlet pipe, and a high-precision oxygen analyzer is connected to the outlet pipe. The test method includes test method three:

[0057] Step 1, 2 atmospheres pressure test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, and inject compressed air into the test pressure tank 100 to make the pressure in the test pressure tank 100 reach 2 atmospheres, close the inlet valve 104, and the oxygen display device 300 records and displays the oxygen partial pressure measurement value detected by the oxygen sensor 19 at 2 atmospheres after stabilization as the first oxygen partial pressure measurement value, which can be observed and recorded through the observation window 107; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and The oxygen partial pressure measurement value obtained after force conversion is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 150KPa by pressure relief, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40%±1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 2 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve 105 is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0058] Step 2, 3 atmospheres test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, inject 8%±1% oxygen standard gas into the test pressure tank 100, make the pressure in the test pressure tank 100 reach 3 atmospheres, close the inlet valve 104, and record the oxygen partial pressure measurement value displayed by the oxygen display device 300 as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and measure the oxygen partial pressure obtained by pressure conversion The value is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 200 KPa by relieving the pressure, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40% ± 1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 3 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve 105 is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500 mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0059] Step 3, 4 atmospheres test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, and inject 8%±1% oxygen standard gas into the test pressure tank 100 to make the pressure in the test pressure tank 100 reach 4 atmospheres, close the inlet valve 104, and record the oxygen partial pressure measurement value displayed by the oxygen display device 300 as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and obtain the oxygen partial pressure after pressure conversion The measured value is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 300 KPa by decompression, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40% ± 1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 4 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500 mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0060] Step 4, 5 atmospheres test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, inject 8%±1% oxygen standard gas into the test pressure tank 100, make the pressure in the test pressure tank 100 reach 5 atmospheres, close the inlet valve 104, and record the oxygen partial pressure measurement value displayed by the oxygen display device 300 as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and measure the oxygen partial pressure obtained by pressure conversion The value is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 450KPa by decompression, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40%±1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 5 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve 105 is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0061] Step 5, 6 atmospheres pressure test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, inject 8%±1% oxygen standard gas into the test pressure tank 100, make the pressure in the test pressure tank 100 reach 6 atmospheres, close the inlet valve 104, and record the oxygen partial pressure measurement value displayed by the oxygen display device 300 as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and measure the oxygen partial pressure obtained by pressure conversion The value is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 550KPa by decompression, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40%±1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 6 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve 105 is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0062] Step 6, 7 atmospheres pressure test: calibrate the oxygen detection device 200 and the oxygen display device 300 that are turned on and connected under normal pressure, the oxygen display device 300 records and displays the oxygen partial pressure value detected by the oxygen sensor 19 of the oxygen detection device 200, close the outlet valve 105, open the inlet valve 104, inject 8%±1% oxygen standard gas into the test pressure tank 100, make the pressure in the test pressure tank 100 reach 7 atmospheres, close the inlet valve 104, and record the oxygen partial pressure measurement value displayed by the oxygen display device 300 as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve 105 and adjust the mass flowmeter so that the outlet flow rate reaches 500mL / min, use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and measure the oxygen partial pressure obtained by pressure conversion The value is used as the second oxygen partial pressure measurement value, and the error calculation is performed with the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 650KPa by decompression, the outlet valve 105 is closed, and the inlet valve 104 is opened to inject 40%±1% oxygen standard gas, so that the pressure in the test pressure tank 100 reaches 7 atmospheres, and the inlet valve 104 is closed. After the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device 300 is recorded as the third oxygen partial pressure measurement value; then the outlet valve 105 is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe.

[0063] Step 7. Qualification judgment: Determine whether each of the 12 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P) kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

[0064] In this method, the two detection errors Δe at 2 atmospheres of pressure are both within the range of ±0.2kPa, the two detection errors Δe at 3 atmospheres of pressure are both within the range of ±0.3kPa, the two detection errors Δe at 4 atmospheres of pressure are both within the range of ±0.4kPa, the two detection errors Δe at 5 atmospheres of pressure are both within the range of ±0.5kPa, the two detection errors Δe at 6 atmospheres of pressure are both within the range of ±0.6kPa, and the two detection errors Δe at 7 atmospheres of pressure are both within the range of ±0.7kPa. The oxygen sensor test is qualified, and at this time, it can be ensured that the oxygen sensor in the oxygen detection device 200 to be launched into the water is tested at 1 to 7 atmospheres. The measurement accuracy can meet the project requirements. Any detection error Δe under 2 atmospheres of pressure is not within the range of ±0.2kPa, any detection error Δe under 3 atmospheres of pressure is not within the range of ±0.3kPa, any detection error Δe under 4 atmospheres of pressure is not within the range of ±0.4kPa, any detection error Δe under 5 atmospheres of pressure is not within the range of ±0.5kPa, any detection error Δe under 6 atmospheres of pressure is not within the range of ±0.6kPa, and any detection error Δe under 7 atmospheres of pressure is not within the range of ±0.7kPa. If any one of the conditions is met, the oxygen sensor test fails. At this time, the oxygen sensor in the oxygen detection device 200 needs to be repaired or replaced.

[0065] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A test system based on a half-water, half-air oxygen monitoring system, characterized in that: The oxygen monitoring system includes an oxygen detection device and an oxygen display device. The inhaled gas inlet end and the inhaled gas outlet end of the oxygen detection device are both provided with bellows. The oxygen detection device includes an oxygen sensor, a main control chip and an antenna. The oxygen display device includes a wireless radio frequency receiving module and a main microcontroller. The oxygen sensor and the antenna are both electrically connected to the main control chip. The antenna is communicatively connected to the wireless radio frequency receiving module. The wireless radio frequency receiving module is electrically connected to the main microcontroller. The test system includes a test pressure tank, the lower part of which carries water, an oxygen detection device and an oxygen display device are both placed in the water in the test pressure tank, the tops of the bellows on both sides extend out of the water, an air inlet and an air outlet are fixedly provided on the top of the test pressure tank, the air inlet is connected to one end of the air inlet pipe, the other end of the air inlet pipe is placed in the bellows corresponding to the intake gas inflow end and is connected to the intake gas inflow joint of the oxygen detection device, an air inlet valve is provided on the air inlet and located outside the test pressure tank, an air outlet valve is provided on the air outlet and located outside the test pressure tank, the test pressure tank is connected to a pressure gauge displaying its internal pressure, and an observation window facing the display screen of the oxygen display device is provided on the top of the test pressure tank.

2. The test system of the half-water and half-gas oxygen monitoring system according to claim 1, characterized in that: The oxygen detection device comprises a first waterproof shell with a hollow inner cavity, a waterproof baffle is fixed at the middle position of the first waterproof shell, the hollow inner cavity of the first waterproof shell is divided into a closed normal pressure chamber without gas exchange and a variable pressure chamber with gas exchange by the waterproof baffle, a normal pressure chamber sealing ring and a normal pressure chamber upper cover are fixed in sequence at the top of the first waterproof shell and directly above the closed normal pressure chamber, a control button is embedded on the normal pressure chamber upper cover, a battery, a control circuit board and an antenna are fixed in the closed normal pressure chamber, a variable pressure chamber sealing ring and a variable pressure chamber upper cover are fixed in sequence at the top of the first waterproof shell and directly above the variable pressure chamber, an inhaled gas outflow joint is penetrated and fixed on the front side of the variable pressure chamber upper cover, an inhaled gas inflow joint is penetrated and fixed on the front side of the bottom shell of the first waterproof shell and directly below the variable pressure chamber, a mounting plate is fixed in the variable pressure chamber near the position where the inhaled gas inflow joint is installed, a differential pressure sensor and an oxygen sensor are fixed on the mounting plate, and the control button, the differential pressure sensor, the oxygen sensor, the antenna and the battery are all electrically connected to the main control chip on the control circuit board.

3. The test system of the half-water and half-gas oxygen monitoring system according to claim 2, characterized in that: An indicator light is embedded on the upper cover of the normal pressure chamber, and the indicator light is electrically connected to the main control chip.

4. The test system of the half-water and half-gas oxygen monitoring system according to claim 2, characterized in that: Contacts are embedded on the upper cover of the normal pressure chamber, and the contacts are electrically connected to the main control chip.

5. The test system of the half-water and half-air oxygen monitoring system according to claim 2, characterized in that: The normal pressure chamber sealing ring adopts a silicone sealing ring, which is composed of an upper normal pressure chamber sealing ring matching the edge of the top shell of the closed normal pressure chamber and a lower normal pressure chamber sealing ring matching the inner wall of the closed normal pressure chamber. The upper normal pressure chamber sealing ring and the lower normal pressure chamber sealing ring are integrally formed, the lower normal pressure chamber sealing ring is placed in the closed normal pressure chamber and fits the inner wall of the closed normal pressure chamber, and the upper normal pressure chamber sealing ring is fixed on the top of the closed normal pressure chamber and fits the edge of the top shell of the closed normal pressure chamber. The transformer cavity sealing ring adopts a silicone sealing ring, which is composed of an upper transformer cavity sealing ring matching the top shell edge of the transformer cavity and a lower transformer cavity sealing ring matching the inner wall of the transformer cavity. The upper transformer cavity sealing ring and the lower transformer cavity sealing ring are integrally formed, the lower transformer cavity sealing ring is placed in the transformer cavity and fits the inner wall of the transformer cavity, and the upper transformer cavity sealing ring is fixed on the top of the transformer cavity and fits the top shell edge of the transformer cavity.

6. The test system of the half-water and half-air oxygen monitoring system according to claim 1, characterized in that: The oxygen display device includes a second waterproof shell with a hollow inner cavity, a display is embedded in the second waterproof shell, a wireless radio frequency receiving module, a power supply, a power management module and a main microcontroller are arranged in the second waterproof shell, the wireless radio frequency receiving module and the display are electrically connected to the main microcontroller, and the power supply is electrically connected to the main microcontroller through the power management module.

7. A testing method for an oxygen monitoring system based on half water and half air, characterized in that: It is implemented by using the test system described in any one of claims 1 to 6, and the test method includes test method 1: The oxygen detection device and oxygen display device connected for startup are calibrated under normal pressure. The oxygen display device records and displays the oxygen partial pressure value transmitted by the oxygen sensor of the oxygen detection device. The outlet valve is closed, the inlet valve is opened, and 23%±1% oxygen standard gas is injected into the test pressure tank to make the pressure in the test pressure tank reach 7 atmospheres. The inlet valve is closed, and the oxygen display device records and displays the oxygen partial pressure measurement value transmitted by the oxygen sensor after the display is stable. Calculate the detection error Δe according to formula (1); Δe=B-B s (1) Where B is the measured value of oxygen partial pressure, B s is the theoretical value of oxygen partial pressure corresponding to 7 atmospheres; Qualification criteria: Determine whether the detection error Δe is within the accuracy range under high pressure. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=7.

8. A testing method for an oxygen monitoring system based on half water and half air, characterized in that: It is implemented by using the test system described in any one of claims 1 to 6, and the test method includes test method 2: The oxygen detection device and oxygen display device connected for startup are calibrated under normal pressure. The oxygen display device records and displays the oxygen partial pressure value transmitted by the oxygen sensor of the oxygen detection device. The outlet valve is closed, the inlet valve is opened, and standard air is injected into the test pressure tank to make the pressure in the test pressure tank reach 2 atmospheres. The inlet valve is closed, and the oxygen display device records and displays the oxygen partial pressure measurement value transmitted by the oxygen sensor at 2 atmospheres after stabilization; Repeat the above operation to make the pressure in the test pressure tank reach 3 atmospheres, 4 atmospheres, 5 atmospheres, 6 atmospheres and 7 atmospheres respectively, close the air inlet valve, and the oxygen display device records the oxygen partial pressure measurement value transmitted by the oxygen sensor at each atmospheric pressure from 3 to 7 atmospheres after the display stabilizes; Calculate the detection error Δe corresponding to each atmospheric pressure in 2-7 atmospheric pressures according to formula (1); Δe=B-B s (1) Where B is the oxygen partial pressure measured at various atmospheric pressures from 2 to 7 atmospheres, B s It is the theoretical value of oxygen partial pressure corresponding to each atmospheric pressure from 2 to 7 atmospheres; Qualification judgment: Determine whether each of the 6 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

9. A testing method for an oxygen monitoring system based on half water and half air, characterized in that: It is implemented by using the test system described in any one of claims 1 to 6, a mass flow meter is provided on the outlet pipe, and a high-precision oxygen analyzer is connected to the outlet pipe. The test method includes test method three: 2 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject compressed air into the test pressure tank to make the pressure in the test pressure tank reach 2 atmospheres. Close the inlet valve. After the oxygen display device records and displays the oxygen partial pressure measurement value detected by the oxygen sensor at 2 atmospheres after stabilization, it is used as the first oxygen partial pressure measurement value. Then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe. The oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The pressure measurement value and the first oxygen partial pressure measurement value are calculated to obtain the detection error Δe; then the pressure is reduced to about 150KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 2 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe; 3 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 3 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The value is compared with the first oxygen partial pressure measurement value to calculate the error to obtain the detection error Δe; then the pressure is reduced to about 200KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 3 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe; 4 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 4 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The value is compared with the first oxygen partial pressure measurement value to calculate the error to obtain the detection error Δe; then the pressure is reduced to about 300KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 4 atmospheres, the inlet valve is closed, and after the value is stable, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error is calculated with the third oxygen partial pressure measurement value to obtain the detection error Δe; 5 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 5 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 450KPa by decompression, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 5 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe; 6 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 6 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 550KPa by decompression, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 6 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe; 7 atmospheres test: calibrate the oxygen detection device and oxygen display device connected to the power on device under normal pressure. The oxygen display device records and displays the oxygen partial pressure value detected by the oxygen sensor of the oxygen detection device. Close the outlet valve, open the inlet valve, and inject 8%±1% oxygen standard gas into the test pressure tank to make the pressure in the test pressure tank reach 7 atmospheres. Close the inlet valve, and record the oxygen partial pressure measurement value displayed by the oxygen display device as the first oxygen partial pressure measurement value after the value stabilizes; then slowly open the outlet valve and adjust the mass flow meter to make the outlet flow rate reach 500mL / min. Use a high-precision oxygen analyzer to detect the oxygen concentration of the gas in the outlet pipe, and the oxygen partial pressure measurement value obtained after pressure conversion is used as the second oxygen partial pressure measurement value. The error calculation is performed between the value and the first oxygen partial pressure measurement value to obtain the detection error Δe; then the pressure is reduced to about 650KPa by relieving the pressure, the outlet valve is closed, the inlet valve is opened, and 40%±1% oxygen standard gas is injected to make the pressure in the test pressure tank reach 7 atmospheres, the inlet valve is closed, and after the value stabilizes, the oxygen partial pressure measurement value displayed by the oxygen display device is recorded as the third oxygen partial pressure measurement value; then the outlet valve is slowly opened and the mass flow meter is adjusted to make the outlet flow rate reach 500mL / min, and the oxygen concentration of the gas in the outlet pipe is detected by a high-precision oxygen analyzer. The oxygen partial pressure measurement value obtained after pressure conversion is used as the fourth oxygen partial pressure measurement value, and the error calculation is performed with the third oxygen partial pressure measurement value to obtain the detection error Δe; Qualification judgment: Determine whether each of the 12 calculated detection errors Δe is within the corresponding high-pressure accuracy range. If so, the oxygen sensor test is qualified, otherwise the oxygen sensor test is unqualified. The accuracy under high pressure is ±(0.1×P)kPa, where P represents the ratio of the actual air pressure of the test environment to 1 atmosphere, and P=2, 3, 4, 5, 6, 7.

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