Device and method for detecting seawater conductivity sensor

Abstract

The invention belongs to the technical field of seawater conductivity sensor inspection, and particularly relates to a device and method for inspecting a seawater conductivity sensor, the device comprises a seawater thermostatic bath and a controller, a horizontal plate is fixedly arranged in the seawater thermostatic bath close to the top, and a suspender A and a suspender B are adjacent and vertically fixed below the horizontal plate; the suspender A is used for fixing a standard platinum resistance thermometer, the suspender B is used for fixing a conductivity sensor sample, and the jet pump is fixedly connected with the horizontal plate; the jet pump is used for sucking seawater in the seawater thermostatic bath through the water suction pipe and spraying the sucked seawater to the standard platinum resistance thermometer and the conductivity sensor sample through the water outlet pipe; a water spraying opening of the water outlet pipe is located below the standard platinum resistance thermometer and the conductivity sensor sample, the vertical distance between the top face of the water spraying opening and the standard platinum resistance thermometer and the conductivity sensor sample is not smaller than 15 cm, and the water spraying opening is in a horn mouth shape. According to the technical scheme, detection errors are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of testing seawater conductivity sensors, and in particular relates to a device and a method for testing seawater conductivity sensors. Background Art

[0002] High-quality test data is the basis of marine scientific research. There are many types of seawater conductivity sensors. The metrological quality inspection of such sensors follows the national metrological verification regulations "JJG763-2019 Temperature, Salinity and Depth Measuring Instrument". The inspection environment temperature is (20±5)℃, and the laboratory salinometer is calibrated with China's first-level standard seawater. The seawater constant temperature bath is filled with filtered ocean water. The standard platinum resistance thermometer is used as the working standard, and the temperature bridge resistance ratio is ±5×10 -7 . In order to measure different conductivity points, the conductivity measurement point can only be changed by changing the temperature when the salinity in the seawater thermostatic bath remains basically unchanged. The primary measuring instrument usually measures 9 temperature points: 35℃, 30℃, 25℃, 20℃, 15℃, 10℃, 5℃, 0℃, and -2℃. When the temperature of a certain inspection temperature point is stable, a seawater sample should be drawn from the seawater thermostatic bath, and the laboratory salinity meter should be used to measure it twice and take the arithmetic mean as the standard salinity value of the calibration point. The standard salinity value is substituted into the formula in "Standard Appendix C" to calculate the standard conductivity value at the corresponding temperature. The standard conductivity value is compared with the conductivity value measured by the conductivity sensor sample at the temperature point to calculate the conductivity indication error and conductivity measurement repeatability of the sample.

[0003] At present, the maximum allowable error of conductivity in the national metrological verification regulations "JJG763-2019 Temperature, Salinity and Depth Measuring Instrument" is ±0.005mS / cm; the seawater conductivity sensor products sold on the market by SEABIRD of the United States and RBR of Canada have a maximum allowable conductivity error of ±0.003mS / cm.

[0004] In order to match the metering performance of the seawater conductivity sensor, the inspection capability of the inspection equipment must be improved simultaneously to minimize the impact of inspection factors on the metering results of the seawater conductivity sensor.

[0005] After careful research, the inventor found that the following two factors have a greater impact on the test results: 1. Bubbles appear around the conductivity sensor sample At temperatures of 35°C, 30°C, 25°C and other points, the dissolved oxygen in the seawater is precipitated due to the high water temperature in the seawater constant temperature bath, which can form a large number of bubbles in a relatively short period of time. The bubbles are concentrated in the sensing part of the statically placed conductivity sensor sample, affecting the conductivity measurement data. As a result, the conductivity data measured by the conductivity sensor sample has a large error, which can easily exceed the maximum allowable error range of conductivity.

[0006] There are two types of sensors commonly used to test seawater conductivity: electrode type and inductive type. The inventors conducted relevant analysis and a large number of experiments on these two types of seawater conductivity sensors, and finally reached a qualitative conclusion: the electrode compartment of the electrode type conductivity sensor is equipped with multiple electrodes, and the structure of the electrode itself is fixed. The conductivity is only affected by the conductivity of the conductive material flowing through the electrode compartment. If bubbles are attached to the electrode compartment, the measured conductivity value will be low. The electromagnetic induction conductivity sensor is surrounded by two coils. The current of the excitation coil forms a magnetic field near the sensor. The generated magnetic field range is generally less than 15cm in radius. If there are metal objects within 15cm, it will have a positive effect on the magnetic field. If there are objects with poor conductivity, it will have a negative effect on the magnetic field. The bubbles attached to the outside of the induction coil belong to the latter, so they will have a negative effect on the magnetic field, which will make the measured conductivity value low.

[0007] (II) There may be dead water in the electrode conductivity sensor In the prior art, seawater samples are directly extracted from a constant temperature tank and used to measure the salinity value with a laboratory salinometer, and then the "standard conductivity value" at the corresponding temperature is calculated. The "standard conductivity value" thus obtained is the basis for calculating the "conductivity indication error" of the conductivity sensor sample.

[0008] However, for the electrode conductivity sensor sample, its conductivity indication depends on the seawater in its electrode compartment. Since the electrode compartment of the electrode conductivity sensor is a through-tube structure, if the fluidity of the seawater in the thermostatic bath is poor, there may be dead water (unflowing water) in the electrode compartment. The dead water and the seawater sample in the thermostatic bath have differences in temperature, salinity and conductivity. In other words, there is an objective difference between the "seawater" measured by the electrode conductivity sensor sample and the "seawater" measured by the laboratory salinometer. When the difference is large, the calculated "conductivity indication error" of the conductivity sensor sample will seriously exceed the "maximum allowable conductivity error" specified in the standard.

[0009] In order to further improve the inspection quality of seawater conductivity sensor samples, matching inspection equipment is urgently needed. Summary of the invention

[0010] The technical problem to be solved by the present invention is to make up for the deficiencies of the prior art and provide a device and method for testing a seawater conductivity sensor.

[0011] To solve the above technical problems, the technical solution of the present invention is: A device for testing a seawater conductivity sensor comprises a seawater thermostatic tank and a controller, wherein the seawater thermostatic tank is used to hold seawater, and the temperature of the seawater in the seawater thermostatic tank is controlled by the controller; a horizontal plate is fixedly arranged near the top of the seawater thermostatic tank, and a suspension rod A and a suspension rod B are adjacent and both vertically fixed below the horizontal plate; the bottom end of the suspension rod A is used to fix and connect a standard platinum resistance thermometer, and the standard platinum resistance thermometer is electrically connected to a temperature measuring bridge; the bottom end of the suspension rod B is used to fix and connect a conductivity sensor sample, and the conductivity sensor sample is electrically connected to a conductivity meter The temperature measuring bridge and the conductivity meter are both electrically connected to the controller; the device also includes a jet pump, which is fixedly connected to the horizontal plate; the jet pump is used to absorb seawater from the seawater constant temperature tank through a water suction pipe, and spray the absorbed seawater outward through a water outlet pipe toward the standard platinum resistance thermometer and the conductivity sensor sample; the water outlet of the water outlet pipe is located below the standard platinum resistance thermometer and the conductivity sensor sample, and the vertical distance between the top surface of the water outlet and the standard platinum resistance thermometer and the conductivity sensor sample is not less than 15 cm, and the shape of the water outlet is a trumpet-shaped shape.

[0012] Furthermore, one end of the water outlet pipe close to the water spray port is fixedly connected to the bracket, and the bracket is fixedly connected to the seawater constant temperature tank.

[0013] Furthermore, a circular water bottle placement area is provided on the upper surface of the seawater constant temperature tank, the circular water bottle placement area is used to place a transparent bottle, the transparent bottle is used to receive the extracted seawater, and a capacity scale is provided on the body of the transparent bottle; it also includes an automatic seawater taking unit, the automatic seawater taking unit includes a lifting mechanism, a horizontal rotation mechanism and a horizontal telescopic mechanism, the fixed end I of the lifting mechanism is fixedly connected to the upper surface of the seawater constant temperature tank, the lifting end of the lifting mechanism is fixedly connected to the fixed end II of the horizontal rotation mechanism, the rotating end of the horizontal rotation mechanism is fixedly connected to the fixed end III of the horizontal telescopic mechanism, and the telescopic end of the horizontal telescopic mechanism is fixedly connected to the fixed end III of the horizontal telescopic mechanism. A suspension rod D is fixedly provided, and the rotation center axis of the horizontal rotation mechanism coincides with the center of the circle of the water receiving bottle placement area; one end of the silicone tube C close to the water outlet CS is fixedly connected to the suspension rod D, and the water outlet CS is always located above the circular water receiving bottle placement area, and is used to guide the extracted seawater into the transparent bottle located in the water receiving bottle placement area; the water inlet CX of the silicone tube C is connected to the water outlet R of the peristaltic pump, and the water inlet R of the peristaltic pump is connected to the water outlet A of the silicone tube A, and the water inlet A of the silicone tube A is used to absorb seawater in the seawater constant temperature tank; the actions of the peristaltic pump, the lifting mechanism, the horizontal rotation mechanism and the horizontal telescopic mechanism are all controlled by the controller.

[0014] Furthermore, the automatic seawater extraction unit also includes a Y-type tee, a two-way solenoid valve and a silicone tube B, the Y-type tee includes three ports, namely, a water inlet i, a water outlet OA and a water outlet OB; the silicone tube C is divided into an upper silicone tube CS and a lower silicone tube CX, the two ends of the upper silicone tube CS are respectively a water inlet CS and the water outlet CS, the two ends of the lower silicone tube CX are respectively a water outlet CX and the water inlet CX; the water inlet CS of the upper silicone tube CS is connected to the water outlet OA of the Y-type tee, the water outlet CX of the lower silicone tube CX is connected to the water inlet i of the Y-type tee, the water outlet OB of the Y-type tee is connected to the water inlet F of the two-way solenoid valve, the water outlet F of the two-way solenoid valve is connected to the water inlet B of the silicone tube B, and the water outlet B of the silicone tube B is used to guide the seawater in the silicone tube B to the seawater constant temperature tank; the silicone tube B is located below the upper silicone tube CS; the action of the two-way solenoid valve is controlled by the controller.

[0015] Furthermore, the two-way solenoid valve and the peristaltic pump are both fixed on the horizontal plate, the upper silicone tube CS extends into the inner cavity of the seawater thermostatic tank through the through hole K on the top of the seawater thermostatic tank, and a sealing material is provided between the through hole K and the upper silicone tube CS.

[0016] Furthermore, it also includes an image recognition sensor A and an image recognition sensor B. The image recognition sensor A is located directly above the water outlet CS of the silicone tube C and is used to observe the bottle mouth position of the transparent bottle. The image recognition sensor A is fixedly connected to the telescopic end of the horizontal telescopic mechanism; the image recognition sensor B is used to observe the liquid level of the transparent bottle. The image recognition sensor B is fixedly connected to the suspension rod C, and the suspension rod C is fixedly connected to the fixed end III of the horizontal telescopic mechanism; the image recognition sensor A and the image recognition sensor B are both electrically connected to the controller.

[0017] Furthermore, the lifting mechanism is an electric cylinder A, which includes a cylinder body A and a telescopic rod A; the horizontal rotation mechanism is a motor B, which is a flange output servo motor, including an output flange, and the motor B is fixedly connected to the telescopic rod A; the horizontal telescopic mechanism is an electric cylinder B, which includes a cylinder body B and a telescopic rod B, and the cylinder body B is fixedly connected to the output flange of the motor B, and the boom D is fixed to the end of the telescopic rod B; the actions of the electric cylinder A, the electric cylinder B and the motor B are all controlled by the controller.

[0018] Furthermore, the electric cylinder A and the electric cylinder B are both servo electric cylinders.

[0019] Furthermore, it also includes a workbench, the temperature measuring bridge, the conductivity meter and the controller are all arranged on the workbench, and a laboratory salinometer is also arranged on the workbench, and the laboratory salinometer is electrically connected to the controller.

[0020] A method for testing a seawater conductivity sensor, using the device for testing a seawater conductivity sensor as described above, comprises the following steps: Step 1: Set 9 temperature values ​​in sequence through the controller, namely: 35℃, 30℃, 25℃, 20℃, 15℃, 10℃, 5℃, 0℃, -2℃, let i be the temperature value sequence, i∈[1,9]; fill the seawater thermostat with filtered ocean water, so that the water inlet J of the water suction pipe is below the seawater level; place 9 empty, open transparent bottles in the water receiving bottle placement area in sequence; Step 2: Control the temperature of the seawater thermostatic bath to reach the first temperature value set in step 1, i=1, and the controller gives a prompt of "put in the sample"; Step 3: Manually fix the conductivity sensor sample to be tested at the bottom end of the suspension rod B and place it below the seawater surface; if the conductivity sensor sample to be tested is an electrode-type conductivity sensor, the water inlet A of the silicone tube A is connected to the electrode compartment through-tube of the electrode-type conductivity sensor; if the conductivity sensor sample to be tested is an inductive conductivity sensor, the water inlet A of the silicone tube A is fixed 15 cm above the inductive conductivity sensor; Step 4: Control the two-way solenoid valve to open, control the peristaltic pump to work, and control the lifting mechanism to rise to the high position; Step 5: Control the jet pump and the seawater thermostatic bath to make the temperature of the seawater thermostatic bath stable at the current set temperature value; at the same time, by controlling the actions of the horizontal rotation mechanism and the horizontal telescopic mechanism, and cooperating with the image sent back by the image recognition sensor A to find a transparent bottle, and align the water outlet CS of the upper silicone tube CS with the bottle mouth of the transparent bottle, and then control the lifting mechanism to drive the water outlet CS of the upper silicone tube CS to drop to a low position, so that the water outlet CS of the upper silicone tube CS extends into the bottle mouth of the transparent bottle; Step 6: When the temperature of the seawater constant temperature bath is stable, the jet pump is controlled to stop working. After 1 minute, the temperature measuring bridge and the conductivity meter upload the measured value to the controller. The measured value uploaded by the conductivity meter is the conductivity indication value measured by the conductivity sensor sample under the temperature point. At the same time, the two-way solenoid valve is controlled to be closed, so that the peristaltic pump pumps the seawater into the transparent bottle. When the amount of seawater in the transparent bottle reaches the specified capacity scale according to the influence of the image recognition sensor B, the two-way solenoid valve is controlled to be opened, and the lifting mechanism is controlled to rise to the high position, and the controller gives a prompt of "seawater sampling is completed"; Step 7: Manually test the seawater sample at the temperature point contained in the transparent bottle by a laboratory salinometer to obtain the standard conductivity value at the temperature point; calculate the difference between the conductivity indication value measured by the conductivity sensor sample under test at the temperature point and the standard conductivity value at the temperature point to obtain the indication error at the temperature point; Step 8: If i<9, the temperature of the seawater thermostatic bath is controlled to reach the next temperature value set in step 1, i=i+1, and steps 4 to 7 are repeated; otherwise, the controller gives a prompt of "test completed".

[0021] The beneficial effects that can be achieved by the present invention are: (1) By matching the jet pump with the trumpet-shaped water outlet of the water outlet pipe, the bubbles attached to the surface of the standard platinum resistance thermometer and the conductivity sensor sample are removed before measurement, making the measurement data of the standard platinum resistance thermometer and the conductivity sensor sample closer to the truth and reducing the detection error.

[0022] (2) Furthermore, by connecting the water inlet A of the silicone tube A for absorbing seawater to the electrode compartment through-tube of the electrode-type conductivity sensor to be detected, the dead water that may exist in the electrode compartment is completely eliminated, thereby further reducing the detection error.

[0023] (3) Furthermore, the automatic seawater extraction unit realizes the automation and timeliness of seawater extraction at the current measurement temperature point, which not only improves the automation level but also further reduces the detection error.

[0024] (4) Furthermore, the use of the jet pump and the peristaltic pump also improves the fluidity and temperature uniformity of the seawater in the seawater constant temperature tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a main cross-sectional view of the main body of an embodiment of the present invention.

[0026] Figure 2 It is a top view of the main part of the embodiment of the present invention.

[0027] Figure 3 yes Figure 1 Magnified view of part I.

[0028] Figure 4 yes Figure 1 Enlarged view of part II.

[0029] Figure 5 It is a front view of the workbench part of an embodiment of the present invention.

[0030] Figure 6 1 is an electric control principle diagram of an embodiment of the present invention.

[0031] In the figure: 1-ground, 2-seawater constant temperature bath, 3-heating device, 4-motor A, 5-stirring wing, 6-protective net, 7-seawater liquid level, 8-water suction pipe, 9-horizontal plate, 10-cover, 11-jet pump, 12-standard platinum resistance thermometer, 13-suspender A, 14-handle, 15-suspender B, 16-handle, 17-silicone tube A, 18-peristaltic pump, 19-transparent bottle, 20-bottle stopper, 21-bottle stopper, 22-upper surface, 23-suspending rope, 24-silicone tube B, 25-workbench, 26-laboratory salinity meter, 27-temperature bridge, 28-conductivity meter, 29-controller, 30-refrigeration device, 31-conductivity sensor Sample, 32-water nozzle, 33-bracket, 34-water outlet pipe, 35-cylinder body B, 36-through hole K, 37-silicone tube C, 3701-upper silicone tube CS, 3702-lower silicone tube CX, 38-sealing material, 39-cylinder body A, 40-telescopic rod A, 41-flange A, 42-motor B, 43-output flange, 44-flange B, 45-ferrule, 46-suspender rod C, 47-clamping ring, 48-telescopic rod B, 49-sleeve, 50-image recognition sensor A, 51-suspender rod D, 52-capacity scale, 53-image recognition sensor B, 54-Y-type three-way, 55-two-way solenoid valve, 56-water bottle placement area. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Example

[0033] A device for testing a seawater conductivity sensor comprises a main body part and a workbench part.

[0034] like Figure 5 As shown, the workbench part includes a workbench 25, which is placed on the ground 1. The workbench 25 is provided with a laboratory salinometer 26, a temperature measuring bridge 27, a conductivity meter 28 and a controller 29. The controller 29 is a display PLC controller. The laboratory salinometer 26, the temperature measuring bridge 27 and the conductivity meter 28 are all electrically connected to the controller 29.

[0035] like Figure 1 and Figure 2 As shown, the main part includes a seawater constant temperature tank 2, which is used to hold seawater. The seawater constant temperature tank 2 includes a tank body, and a cover 10 for easy opening and closing is provided on the top of the tank body, and a handle 14 is provided on the cover 10; the tank body also includes a heating device 3, a refrigeration device 30 and a stirring device, and the stirring device includes a motor A4 and stirring wings 5. The motor A4 is a waterproof motor, and the stirring wings 5 ​​are driven by the motor A4. A protective net 6 is provided on the periphery of the stirring wings 5, and the protective net 6 is fixedly connected to the tank body; the heating device 3, the refrigeration device 30 and the motor A4 are all controlled by a controller 29.

[0036] A horizontal plate 9 is fixedly provided near the top of the seawater constant temperature tank 2, and the suspension rod A13 and the suspension rod B15 are adjacent and both vertically fixed below the horizontal plate 9; the bottom end of the suspension rod A13 is used to fix and connect a standard platinum resistance thermometer 12, and the standard platinum resistance thermometer 12 is electrically connected to the temperature measuring bridge 27; the bottom end of the suspension rod B15 is used to fix and connect a conductivity sensor sample 31, and a handle 16 (for easy sampling) is provided on the horizontal plate 9, and the conductivity sensor sample 31 is electrically connected to the conductivity meter 28.

[0037] Table 1: Inspection equipment It also includes a jet pump 11, which is a stainless steel self-priming jet pump, and the jet pump 11 is fixedly connected to the horizontal plate 9; the jet pump 11 is used to absorb seawater in the seawater constant temperature tank 2 through the water suction pipe 8, and spray the absorbed seawater outward through the water outlet pipe 34 toward the standard platinum resistance thermometer 12 and the conductivity sensor sample 31; the water outlet 32 ​​of the water outlet pipe 34 is located below the standard platinum resistance thermometer 12 and the conductivity sensor sample 31, and the vertical distance between the top surface of the water outlet 32 ​​and the standard platinum resistance thermometer 12 and the conductivity sensor sample 31 is not less than 15 cm, and the shape of the water outlet 32 ​​is trumpet-shaped; one end of the water outlet pipe 34 close to the water outlet 32 ​​is fixedly connected to the bracket 33, and the bracket 33 is fixedly connected to the seawater constant temperature tank 2.

[0038] A circular water bottle placement area 56 is provided on the upper surface 22 of the seawater constant temperature tank 2. The circular water bottle placement area 56 is used to place a transparent bottle 19. The transparent bottle 19 is used to receive the extracted seawater, and a volume scale 52 is provided on the body of the transparent bottle 19. The bottle stopper 20 is used to match and cap the transparent bottle 19. The bottle stopper 20 and the transparent bottle 19 are combined to form a capped bottle 21. It also includes an automatic seawater intake unit, which includes a lifting mechanism, a horizontal rotation mechanism, a horizontal telescopic mechanism, a peristaltic pump 18, a silicone tube, a Y-type three-way valve 54 and a two-way electromagnetic valve 55.

[0039] The lifting mechanism is an electric cylinder A, which includes a cylinder body A39 and a telescopic rod A40. A flange A41 is fixedly provided on the top of the telescopic rod A40, and the cylinder body A39 is fixedly connected to the seawater constant temperature tank 2. The horizontal rotation mechanism is a motor B42, which is a flange output servo motor, including an output flange 43. The rotation center axis of the output flange 43 coincides with the center of the circle of the water bottle placement area 56, and the motor B42 is fixedly connected to the flange A41 on the top of the telescopic rod A40. The horizontal telescopic mechanism is an electric cylinder B, which includes a cylinder body B35 and a telescopic rod B48. A ferrule 45 is fixedly provided on the cylinder body B35, and the ferrule 45 is fixedly connected to the flange B44. The flange B44 is fixedly connected to the output flange 43 of the motor B42; a shaft sleeve 49 is fixedly provided on the overhanging end of the telescopic rod B48, and the suspension rod D51 is fixedly connected to the shaft sleeve 49. The electric cylinder A and the electric cylinder B are both servo electric cylinders, and the actions of the electric cylinder A, the electric cylinder B and the motor B42 are all controlled by the controller 29.

[0040] The silicone tube includes silicone tube C37, silicone tube A17 and silicone tube B24. Silicone tube C37 is divided into upper silicone tube CS3701 and lower silicone tube CX3702. The two ends of upper silicone tube CS3701 are water inlet CS and water outlet CS respectively, and the two ends of lower silicone tube CX3702 are water outlet CX and water inlet CX respectively. The two ends of silicone tube A17 are water inlet A and water outlet A respectively. The two ends of silicone tube B24 are water inlet B and water outlet B respectively.

[0041] The Y-shaped tee 54 includes three ports, namely a water inlet i, a water outlet OA and a water outlet OB.

[0042] One end of the upper silicone tube CS3701 near the water outlet CS is fixedly connected to the suspension rod D51. The water outlet CS is always located above the circular water bottle placement area 56, and is used to guide the extracted seawater into the transparent bottle 19 located in the water bottle placement area 56; the water inlet CS of the upper silicone tube CS3701 is connected to the water outlet OA of the Y-type tee 54. The water outlet OB of the Y-type tee 54 is connected to the water inlet F of the two-way electromagnetic valve 55, and the water outlet F of the two-way electromagnetic valve 55 is connected to the water inlet B of the silicone tube B24. The water outlet B of the silicone tube B24 is used to guide the seawater in the silicone tube B24 to the seawater constant temperature tank 2; the silicone tube B24 is located below the upper silicone tube CS3701, and the silicone tube B24 is lifted by the horizontal plate 9 through the lifting rope 23. The water inlet i of the Y-type tee 54 is connected to the water outlet CX of the lower silicone tube CX3702, the water inlet CX of the lower silicone tube CX3702 is connected to the water outlet R of the peristaltic pump 18, the water inlet R of the peristaltic pump 18 is connected to the water outlet A of the silicone tube A17, and the water inlet A of the silicone tube A17 is used to absorb seawater from the seawater thermostatic tank 2. The two-way solenoid valve 55 and the peristaltic pump 18 are both fixed on the horizontal plate 9, and the actions of the two-way solenoid valve 55 and the peristaltic pump 18 are controlled by the controller 29. The upper silicone tube CS3701 extends into the inner cavity of the seawater thermostatic tank 2 through the through hole K36 at the top of the seawater thermostatic tank 2, and a sealing material 38 is provided between the through hole K36 and the upper silicone tube CS3701.

[0043] It also includes an image recognition sensor A50 and an image recognition sensor B53. The image recognition sensor A50 is located just above the water outlet CS of the silicone tube C37 and is used to observe the position of the bottle mouth of the transparent bottle 19. The image recognition sensor A50 is fixedly connected to the shaft sleeve 49. The image recognition sensor B53 is used to observe the liquid level of the transparent bottle 19. The image recognition sensor B53 is fixedly connected to the suspension rod C46, ​​the suspension rod C46 is fixedly connected to the clamping ring 47, and the clamping ring 47 is fixedly connected to the cylinder body B35 of the electric cylinder B. The image recognition sensor A50 and the image recognition sensor B53 are both Ai image recognition sensors, and are both electrically connected to the controller 29.

[0044] The method of using this embodiment includes the following steps: Step 1: Set 9 temperature values ​​in sequence through the controller 29, which are: 35°C, 30°C, 25°C, 20°C, 15°C, 10°C, 5°C, 0°C, -2°C, let i be the temperature value sequence, i∈[1,9]; fill the seawater constant temperature bath 2 with filtered ocean seawater, so that the water inlet J of the water suction pipe 8 is located below the seawater level 7; place 9 empty, open transparent bottles 19 in sequence in the water bottle placement area 56.

[0045] Step 2: Control the temperature of the seawater constant temperature bath 2 to reach the first temperature value set in step 1, i=1, and the controller gives a prompt of "put in the sample".

[0046] Step 3: Manually fix the conductivity sensor sample 31 to be tested at the bottom end of the suspension rod B15 and place it below the seawater level 7; if the conductivity sensor sample 31 to be tested is an electrode conductivity sensor, the water inlet A of the silicone tube A17 is connected to the electrode compartment through-tube of the electrode conductivity sensor; if the conductivity sensor sample 31 to be tested is an inductive conductivity sensor, the water inlet A of the silicone tube A17 is fixed 15 cm above the inductive conductivity sensor; the electrode conductivity sensor to be tested in this embodiment is the SBE37SM electrode conductivity sensor produced by the American SBE company; the inductive conductivity sensor to be tested in this embodiment is the concerno3 inductive conductivity sensor produced by the Canadian RBR company.

[0047] Step 4: Control the two-way solenoid valve 55 to open, control the peristaltic pump 18 to work, and control the lifting mechanism to rise to a high position.

[0048] Step 5: Control the jet pump 11 and the seawater constant temperature bath 2 to work, so that the temperature of the seawater constant temperature bath 2 is stabilized at the current set temperature value; at the same time, by controlling the action of the horizontal rotation mechanism and the horizontal telescopic mechanism, and cooperating with the image sent back by the image recognition sensor A50, find a transparent bottle 19, and align the water outlet CS of the upper silicone tube CS3701 with the bottle mouth of the transparent bottle 19, and then control the lifting mechanism to drive the water outlet CS of the upper silicone tube CS3701 to descend to a low position, so that the water outlet CS of the upper silicone tube CS3701 extends into the bottle mouth of the transparent bottle 19.

[0049] Step six: When the temperature of the seawater constant temperature bath 2 is stabilized, the jet pump 11 is controlled to stop working. After 1 minute, the temperature measuring bridge 27 and the conductivity meter 28 upload the measured values ​​to the controller 29. The measured values ​​uploaded by the conductivity meter 28 are the conductivity indications measured by the conductivity sensor sample 31 under the temperature point. At the same time, the two-way solenoid valve 55 is controlled to be closed, so that the peristaltic pump 18 pumps seawater into the transparent bottle 19. When the amount of seawater in the transparent bottle 19 reaches the specified capacity scale 52 according to the influence of the image recognition sensor B53, the two-way solenoid valve 55 is controlled to be opened, and the lifting mechanism is controlled to rise to a high position, and the controller gives a prompt of "seawater sampling is completed".

[0050] Step 7: Manually test the seawater sample at the temperature point contained in the transparent bottle 19 through the laboratory salinity meter 26 to obtain the standard conductivity value at the temperature point; calculate the difference between the conductivity indication value measured by the conductivity sensor sample 31 at the temperature point and the standard conductivity value at the temperature point to obtain the indication error at the temperature point.

[0051] Step 8: If i<9, the temperature of the seawater thermostatic bath 2 is controlled to reach the next temperature value set in step 1, i=i+1, and steps 4 to 7 are repeated; otherwise, the controller gives a prompt of "test completed".

[0052] Comparative Example 1 The conductivity sensor sample 31 tested is an electrode conductivity sensor. The jet pump 11 is not turned on during the use process. The rest is the same as the embodiment. The indication error of the test is shown in Table 2.

[0053] Comparative Example 2 The conductivity sensor sample 31 tested is an inductive conductivity sensor. The jet pump 11 is not turned on during the use process. The rest is the same as the embodiment. The indication error of the test is shown in Table 2.

[0054] Comparative Example 3 The conductivity sensor sample 31 tested is an electrode conductivity sensor, and the water inlet A of the silicone tube A17 is not connected to the electrode compartment through-tube of the electrode conductivity sensor, but the water inlet A of the silicone tube A17 is directly immersed below the seawater level 7 of the seawater constant temperature tank 2, and the rest is the same as the embodiment. The indication error of the test is shown in Table 3.

[0055] Table 2: Comparison of results with and without expelling bubbles Table 3: Comparison of the results of whether there is dead water in the electrode compartment of the electrode conductivity sensor From the results in Table 2 and Table 3, it can be seen that the use of jet pumps and peristaltic pumps has significantly improved the quality of test data. When the indication error of the seawater conductivity sensor sample itself is "qualified", there will be no excessive error due to the inspection method (the indication results are all within ±0.003mS / cm), making "qualified" "qualified" and avoiding "qualified" being identified as "unqualified".

[0056] In the description of the present invention, words indicating orientation or positional relationship such as "inside", "outside", "upper", "lower", "front", and "back" are only used to facilitate the description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] The above is only one embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications made without departing from the idea of ​​the present invention are all within the protection scope of the present invention.

Claims

1. A device for testing a seawater conductivity sensor, comprising a seawater thermostatic tank (2) and a controller (29), wherein the seawater thermostatic tank (2) is used to contain seawater, and the temperature of the seawater in the seawater thermostatic tank (2) is controlled by the controller (29); a horizontal plate (9) is fixedly provided near the top of the seawater thermostatic tank (2), and a suspension rod A (13) and a suspension rod B (15) are adjacent and both vertically fixed below the horizontal plate (9); the bottom end of the suspension rod A (13) is used to be fixedly connected to a standard platinum resistance thermometer (12), and the standard platinum resistance thermometer (12) is electrically connected to a temperature measuring bridge (27); the bottom end of the suspension rod B (15) is used to be fixedly connected to a conductivity sensor sample (31), and the conductivity sensor sample (31) is electrically connected to a conductivity meter (28); the temperature measuring bridge (27) and the conductivity meter (28) are both electrically connected to the controller (29); wherein: The apparatus also comprises a jet pump (11) which is fixedly connected to the horizontal plate (9); the jet pump (11) is used to absorb seawater in the seawater constant temperature tank (2) through a water suction pipe (8), and to eject the absorbed seawater outward through a water outlet pipe (34) toward the standard platinum resistance thermometer (12) and the conductivity sensor sample (31); a water spray port (32) of the water outlet pipe (34) is located below the standard platinum resistance thermometer (12) and the conductivity sensor sample (31), and the vertical distance between the top surface of the water spray port (32) and the standard platinum resistance thermometer (12) and the conductivity sensor sample (31) is not less than 15 cm, and the shape of the water spray port (32) is a trumpet-shaped shape.

2. The device for testing seawater conductivity sensor according to claim 1, characterized in that: One end of the water outlet pipe (34) close to the water spray port (32) is fixedly connected to the bracket (33), and the bracket (33) is fixedly connected to the seawater constant temperature tank (2).

3. The device for testing seawater conductivity sensor according to claim 1, characterized in that: The upper surface (22) of the seawater constant temperature tank (2) is provided with a circular water bottle placement area (56), the circular water bottle placement area (56) is used to place a transparent bottle (19), the transparent bottle (19) is used to receive the extracted seawater, and the transparent bottle (19) is provided with a capacity scale (52) on the bottle body; the automatic seawater taking unit is also included, the automatic seawater taking unit comprises a lifting mechanism, a horizontal rotation mechanism and a horizontal telescopic mechanism, the fixed end I of the lifting mechanism is fixedly connected to the upper surface (22) of the seawater constant temperature tank (2), the lifting end of the lifting mechanism is fixedly connected to the fixed end II of the horizontal rotation mechanism, the rotating end of the horizontal rotation mechanism is fixedly connected to the fixed end III of the horizontal telescopic mechanism, the telescopic end of the horizontal telescopic mechanism is fixedly provided with a suspension rod D (51), and the horizontal rotation mechanism is fixedly connected to the fixed end II of the horizontal rotation mechanism. The rotary center axis of the driving mechanism coincides with the center of the circle of the water receiving bottle placement area (56); one end of the silicone tube C (37) close to the water outlet CS is fixedly connected to the suspension rod D (51); the water outlet CS is always located above the circular water receiving bottle placement area (56) and is used to guide the extracted seawater into the transparent bottle (19) located in the water receiving bottle placement area (56); the water inlet CX of the silicone tube C (37) is connected to the water outlet R of the peristaltic pump (18); the water inlet R of the peristaltic pump (18) is connected to the water outlet A of the silicone tube A (17); the water inlet A of the silicone tube A (17) is used to absorb seawater in the seawater constant temperature tank (2); the actions of the peristaltic pump (18), the lifting mechanism, the horizontal rotation mechanism and the horizontal telescopic mechanism are all controlled by the controller (29).

4. The device for testing a seawater conductivity sensor according to claim 3, characterized in that: The automatic seawater taking unit further comprises a Y-shaped three-way valve (54), a two-way solenoid valve (55) and a silicone tube B (24). The Y-shaped three-way valve (54) comprises three ports, namely a water inlet i, a water outlet OA and a water outlet OB. The silicone tube C (37) is divided into an upper silicone tube CS (3701) and a lower silicone tube CX (3702). The two ends of the upper silicone tube CS (3701) are respectively a water inlet CS and the water outlet CS, and the two ends of the lower silicone tube CX (3702) are respectively a water outlet CX and the water inlet CX. The water inlet CS of the upper silicone tube CS (3701) is connected to the Y-shaped three-way valve (55). The water outlet OA of the lower silicone tube CX (3702) is connected to the water inlet i of the Y-shaped tee (54), the water outlet OB of the Y-shaped tee (54) is connected to the water inlet F of the two-way solenoid valve (55), the water outlet F of the two-way solenoid valve (55) is connected to the water inlet B of the silicone tube B (24), and the water outlet B of the silicone tube B (24) is used to guide the seawater in the silicone tube B (24) to the seawater constant temperature tank (2); the silicone tube B (24) is located below the upper silicone tube CS (3701); the action of the two-way solenoid valve (55) is controlled by the controller (29).

5. The device for testing a seawater conductivity sensor according to claim 4, characterized in that: The two-way solenoid valve (55) and the peristaltic pump (18) are both fixed on the horizontal plate (9); the upper silicone tube CS (3701) extends into the inner cavity of the seawater constant temperature tank (2) through a through hole K (36) at the top of the seawater constant temperature tank (2); and a sealing material (38) is provided between the through hole K (36) and the upper silicone tube CS (3701).

6. The device for testing a seawater conductivity sensor according to claim 4, characterized in that: The device also includes an image recognition sensor A (50) and an image recognition sensor B (53). The image recognition sensor A (50) is located directly above the water outlet CS of the silicone tube C (37) and is used to observe the position of the bottle mouth of the transparent bottle (19). The image recognition sensor A (50) is fixedly connected to the telescopic end of the horizontal telescopic mechanism. The image recognition sensor B (53) is used to observe the liquid level of the transparent bottle (19). The image recognition sensor B (53) is fixedly connected to the suspension rod C (46). The suspension rod C (46) is fixedly connected to the fixed end III of the horizontal telescopic mechanism. The image recognition sensor A (50) and the image recognition sensor B (53) are both electrically connected to the controller (29).

7. The device for testing a seawater conductivity sensor according to claim 3, characterized in that: The lifting mechanism is an electric cylinder A, which includes a cylinder body A (39) and a telescopic rod A (40); the horizontal rotation mechanism is a motor B (42), which is a flange output servo motor and includes an output flange (43), and the motor B (42) is fixedly connected to the telescopic rod A (40); the horizontal telescopic mechanism is an electric cylinder B, which includes a cylinder body B (35) and a telescopic rod B (48), and the cylinder body B (35) is fixedly connected to the output flange (43) of the motor B (42), and the suspension rod D (51) is fixed to the end of the telescopic rod B (48); the actions of the electric cylinder A, the electric cylinder B and the motor B (42) are all controlled by the controller (29).

8. The device for testing a seawater conductivity sensor according to claim 7, characterized in that: The electric cylinder A and the electric cylinder B are both servo electric cylinders.

9. The device for testing a seawater conductivity sensor according to claim 1, characterized in that: It also includes a workbench (25), on which the temperature measuring bridge (27), the conductivity meter (28) and the controller (29) are all arranged. A laboratory salinometer (26) is also arranged on the workbench (25), and the laboratory salinometer (26) is electrically connected to the controller (29).

10. A method for testing a seawater conductivity sensor, characterized in that: The device for testing the seawater conductivity sensor as claimed in claim 6 comprises the following steps: Step 1: 9 temperature values ​​are set in sequence through the controller (29), namely: 35°C, 30°C, 25°C, 20°C, 15°C, 10°C, 5°C, 0°C, -2°C, where i is the order of the temperature values, i∈[1,9]; filtered ocean water is placed in the seawater constant temperature tank (2) so that the water inlet J of the water suction pipe (8) is located below the seawater surface (7); 9 empty, open transparent bottles (19) are placed in sequence in the water receiving bottle placement area (56); Step 2: Control the temperature of the seawater constant temperature bath (2) to reach the first temperature value set in step 1, i=1, and the controller gives a prompt of "put in the sample"; Step 3: manually fix the conductivity sensor sample (31) to be tested at the bottom end of the suspension rod B (15) and place it below the seawater level (7); if the conductivity sensor sample (31) to be tested is an electrode-type conductivity sensor, the water inlet A of the silicone tube A (17) is connected to the electrode compartment through-tube of the electrode-type conductivity sensor; if the conductivity sensor sample (31) to be tested is an inductive conductivity sensor, the water inlet A of the silicone tube A (17) is fixed 15 cm above the inductive conductivity sensor; Step 4: Control the two-way solenoid valve (55) to open, control the peristaltic pump (18) to work, and control the lifting mechanism to rise to a high position; Step 5: Control the jet pump (11) and the seawater constant temperature tank (2) to work, so that the temperature of the seawater constant temperature tank (2) is stabilized at the current set temperature value; at the same time, by controlling the movement of the horizontal rotation mechanism and the horizontal telescopic mechanism, and in coordination with the image transmitted back by the image recognition sensor A (50), find a transparent bottle (19), and align the water outlet CS of the upper silicone tube CS (3701) with the bottle mouth of the transparent bottle (19), and then control the lifting mechanism to drive the water outlet CS of the upper silicone tube CS (3701) to descend to a low position, so that the water outlet CS of the upper silicone tube CS (3701) extends into the bottle mouth of the transparent bottle (19); Step 6: When the temperature of the seawater constant temperature bath (2) is stabilized, the jet pump (11) is controlled to stop working. After 1 minute, the temperature measuring bridge (27) and the conductivity meter (28) upload the measured values ​​to the controller (29). The measured value uploaded by the conductivity meter (28) is the conductivity indication value measured by the conductivity sensor sample (31) under the temperature point. At the same time, the two-way solenoid valve (55) is controlled to be closed, so that the peristaltic pump (18) pumps seawater into the transparent bottle (19). When the amount of seawater in the transparent bottle (19) reaches the specified capacity scale (52) according to the influence of the image recognition sensor B (53), the two-way solenoid valve (55) is controlled to be opened, and the lifting mechanism is controlled to rise to a high position, and the controller gives a prompt of "seawater sampling is completed". Step 7: manually testing the seawater sample at the temperature point contained in the transparent bottle (19) by means of a laboratory salinometer (26) to obtain a standard conductivity value at the temperature point; calculating the difference between the conductivity indication value measured by the conductivity sensor sample (31) under test at the temperature point and the standard conductivity value at the temperature point to obtain an indication error at the temperature point; Step 8: If i<9, the temperature of the seawater constant temperature bath (2) is controlled to reach the next temperature value set in step 1, i=i+1, and steps 4 to 7 are repeated; otherwise, the controller gives a prompt of "test completed".

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