A seawater conductivity detection device and detection method

Abstract

The application relates to a seawater conductivity detection device and a detection method, and belongs to the technical field of sensors, which solves the problems of poor detection precision, short service life and inconvenient operation of a traditional seawater conductivity sensor in the prior art. The application comprises a pressure sensor, a conductivity sensor, a temperature sensor, a multi-parameter data processing unit and a seawater detection box, the pressure sensor is arranged outside the seawater detection box and located in seawater, the conductivity sensor, the temperature sensor and the multi-parameter data processing unit are arranged in the seawater detection box, and the pressure sensor, the conductivity sensor and the temperature sensor are electrically connected with the multi-parameter data processing unit. The application removes the influence of pressure and temperature on seawater conductivity, and improves the detection precision.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a seawater conductivity detection device and detection method. Background Technology

[0002] Seawater conductivity is an important parameter for basic marine hydrological information. In terms of marine resource development and utilization, accurate knowledge of conductivity is crucial for accelerating marine development technology research and promoting the development of my country's marine development industry.

[0003] Currently, my country is developing towards becoming a maritime power, and marine development and its industrial applications have received unprecedented attention. Research on seawater conductivity detection technology will make a significant contribution to this, and is of great significance for studying marine structure, seawater composition, marine communication, and resource development. However, current domestic conductivity sensors suffer from narrow detection ranges, a limited number of electrode probes, insufficient accuracy, and high production costs. Mass production still faces some challenges and cannot yet meet the needs of various application fields.

[0004] Meanwhile, conductivity sensors exhibit cross-sensitivity to temperature and pressure. In experiments and field tests, fluctuations in temperature and pressure affect conductivity measurements, causing changes in the output voltage of the conductivity sensor. This is especially true in the complex marine environment, where even at the same test location, fluctuations in temperature and pressure, large or small, can easily impact the test results. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a seawater conductivity detection device and method to solve the problems of poor detection accuracy, short lifespan, and inconvenient operation of existing traditional seawater conductivity sensors.

[0006] On one hand, the present invention provides a seawater conductivity detection device, including a pressure sensor, a conductivity sensor, a temperature sensor, a multi-parameter data processing unit, and a seawater detection box. The pressure sensor is located outside the seawater detection box and inside the seawater. The conductivity sensor, temperature sensor, and multi-parameter data processing unit are located inside the seawater detection box. The pressure sensor, conductivity sensor, and temperature sensor are electrically connected to the multi-parameter data processing unit.

[0007] Furthermore, it also includes a detection pool, in which the conductivity sensor and temperature sensor are disposed.

[0008] Furthermore, it also includes a water pump, and both the water pump and the detection pool are located inside the seawater detection tank.

[0009] Furthermore, the water pump and the detection pool are connected through a first seawater diversion pipe.

[0010] Furthermore, the water pump draws water from the sea into the seawater detection box through a second seawater diversion pipe, one end of which extends into the sea and the other end is connected to the water pump.

[0011] Furthermore, the end of the second seawater diversion pipe is provided with a seawater filter cover, and the surface of the seawater filter cover is provided with a filter membrane.

[0012] Furthermore, the pressure sensor is installed at the center of the filter membrane.

[0013] Furthermore, the seawater testing box is provided with a drain hole, one end of the third seawater diversion pipe is connected to the testing pool, and the other end extends out of the seawater testing box through the drain hole.

[0014] Furthermore, the parameter data acquired by the pressure sensor, conductivity sensor, and temperature sensor are transmitted to the multi-parameter data processing unit via signal transmission lines.

[0015] On the other hand, the present invention provides a method for detecting seawater conductivity, using the aforementioned seawater conductivity detection device, the steps of which include:

[0016] Step 1: Turn on the water pump to fill the testing tank with water; at the same time, the pressure sensor acquires the pressure data of the seawater and transmits it to the multi-parameter data processing unit.

[0017] Step 2: When the seawater in the detection pool submerges the conductivity sensor and temperature sensor, the water pump is turned off. The conductivity sensor and temperature sensor acquire the conductivity data and temperature data of the seawater respectively and transmit them to the multi-parameter data processing unit.

[0018] Step 3: The multi-parameter data processing unit performs data fusion processing on the pressure data, temperature data, and conductivity data;

[0019] Step 4: Drain the seawater from the testing pool to complete the test.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] (1) The seawater conductivity detection device provided by the present invention abandons the previous cumbersome and mechanically heavy structure, has a compact structure, is small and portable, has high measurement efficiency in seawater, can realize real-time detection of seawater conductivity, and can eliminate the influence of seawater impurities and seawater temperature on seawater conductivity detection, significantly improve detection accuracy and extend the service life of the detection device.

[0022] (2) The seawater conductivity detection device provided by the present invention is simple and convenient to operate. It does not require the conductivity sensor to be lowered into the seawater for detection. The conductivity of seawater at different depths can be detected directly on the shore or on a boat.

[0023] (3) The multi-parameter data processing unit provided by the present invention applies a multi-parameter data processing algorithm to further improve the detection accuracy.

[0024] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0025] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0026] Figure 1 This is a schematic diagram of the structure of a seawater conductivity detection device according to a specific embodiment.

[0027] Figure label:

[0028] 1-Pressure sensor; 2-Conductivity sensor; 3-Temperature sensor; 4-Multi-parameter data processing unit; 5-Seawater detection box; 6-Detection pool; 7-Water pump; 8-First seawater diversion pipe; 9-Second seawater diversion pipe; 10-Seawater filter cover; 11-Third seawater diversion pipe; 12-Signal transmission line. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0031] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0032] This invention discloses a seawater conductivity detection device, including a pressure sensor, a conductivity sensor, a temperature sensor, a multi-parameter data processing unit, and a seawater detection box. The pressure sensor is located outside the seawater detection box and inside the seawater. The conductivity sensor, temperature sensor, and multi-parameter data processing unit are located inside the seawater detection box. The pressure sensor, conductivity sensor, and temperature sensor are electrically connected to the multi-parameter data processing unit.

[0033] Compared with existing technologies, the seawater conductivity detection device provided in this embodiment uses a pressure sensor placed in the sea to detect seawater pressure. The seawater detection tank does not need to be placed in the sea; instead, seawater is drawn into the detection tank for temperature and conductivity detection. Then, a multi-parameter data processing unit is used to fuse the seawater pressure, temperature, and conductivity data. This reduces the impact of seawater on the conductivity detection device, extends the service life of the conductivity sensor, and significantly improves detection accuracy through the fusion processing of seawater pressure, temperature, and conductivity data by the multi-parameter data processing unit.

[0034] To measure the temperature and conductivity of seawater within a seawater testing tank, the seawater conductivity testing device also includes a testing pool located inside the seawater testing tank. Conductivity and temperature sensors are located within the testing pool.

[0035] In order to draw seawater into the seawater testing tank, the seawater conductivity testing device also includes a water pump, which is located inside the seawater testing tank and draws seawater from the sea into the testing pool of the seawater testing tank.

[0036] The water pump is connected to the testing pool via a seawater inlet pipe. Seawater drawn from the sea by the pump enters the testing pool through the seawater inlet pipe. Additionally, the pump draws water from the sea into the testing pool via another seawater inlet pipe; one end of the inlet pipe extends into the sea, and the other end is connected to the water pump inside the seawater testing tank. The pump is then connected to the testing pool via another seawater inlet pipe.

[0037] Considering that seawater contains impurities such as sand, algae, and small marine organisms, when the water pump draws seawater through the seawater diversion pipe, it may draw these impurities into the pump and then into the testing pool. This will affect both the accuracy of seawater testing and the lifespan of various equipment.

[0038] To prevent the water pump from drawing in debris while pumping seawater, a seawater filter cover is installed at the end of the seawater intake pipe that extends into the sea. This filter cover removes impurities such as sand, algae, and small marine organisms from the seawater. The surface of the seawater filter cover is a filter membrane with numerous micropores. A pressure sensor is installed at the point where the seawater is drawn from the filter cover, and the pressure sensor is installed at the center of the filter membrane.

[0039] The tested seawater needs to be drained from the seawater testing tank. The seawater testing tank is equipped with a drain hole, which is used to drain the seawater when it needs to be replaced in the testing tank. To prevent seawater from damaging the components inside the seawater testing tank, the seawater in the testing tank is drained out of the seawater testing tank through a seawater drainage pipe. One end of the seawater drainage pipe is connected to the testing tank, and the other end passes through the drain hole on the seawater testing tank.

[0040] A pressure sensor detects the pressure of the extracted seawater to calculate its depth. A temperature sensor detects the temperature of the extracted seawater, and a conductivity sensor detects its conductivity.

[0041] Since the pressure sensor, temperature sensor, and conductivity sensor are all electrically connected to the multi-parameter data processing unit, the parameter data acquired by the pressure sensor, temperature sensor, and conductivity sensor are transmitted to the multi-parameter data processing unit through signal transmission lines.

[0042] The multi-parameter data processing unit is used to comprehensively process the detection values ​​of pressure sensor, temperature sensor and conductivity sensor. It applies multi-parameter data processing methods to reduce the influence of seawater pressure and temperature on conductivity detection and improve detection accuracy.

[0043] The multi-parameter data processing unit uses the following method for data fusion processing of temperature, pressure, and conductivity:

[0044] Let the sequence of reference conductivity be X0=(x0(1),x0(2)…,x0(20)), which is the sequence of characteristic behaviors of the system.

[0045] The voltage output sequences of the three sensors, namely conductivity, temperature and pressure, are X1=(x1(1),x1(2)…,x1(20)), X2=(x2(1),x2(2)…,x2(20)), and X3=(x3(1),x3(2)…,x3(20)), which are the relevant factor sequences.

[0046] For ξ∈(0,1), let

[0047]

[0048] Where ξ is the resolution coefficient, and ξ is taken as 0.5; γ(x0(k),x i (k) represents the sequence X0 and X...i The grey relational coefficient at the k-th point.

[0049] The calculation steps for determining the correlation coefficients between the voltage output sequences of the conductivity, temperature, and pressure sensors and the reference conductivity sequence based on the above formula are as follows:

[0050] (1) Find the initial phase of each sequence, let

[0051] X j =X j / x j (1)=(x j '(1),x j '(2),…x j '(20))

[0052] (2) Find the difference sequence, let ?

[0053] Δ i (k)=|x0'(k)-x i '(k)

[0054] Δ i =(Δ i (1), Δ i (2), …, Δ i (20)

[0055] (3) Find the maximum and minimum differences between the two poles, and denote them as follows:

[0056]

[0057] (4) Calculate the correlation coefficient

[0058]

[0059] Where j = 0, 1, 2, 3; i = 1, 2, 3; k = 1, 2, ... 20.

[0060] Therefore, we obtain γ 0i (k) The grey relational matrix T established is represented in the following form:

[0061]

[0062] γ 0i The larger (k) is, the greater the Xth value of the sensor. i The closer the k-th point of the sequence is to the point corresponding to the reference conductivity sequence, the greater its weight should be in the data fusion.

[0063] Therefore, weights are introduced into the modeling process, let ω 0i (k) is the Xth iThe weight of a sequence at point k in the data fusion expression is given by the expression for the weight coefficient:

[0064] ω 0i (k)=γ 0i (k) / (γ 01 (k)+γ 02 (k)+γ 03 (k))

[0065] Therefore, the fitted conductivity formulas for the conductivity sensor, temperature sensor, and pressure sensor on the k-th test data are:

[0066]

[0067] By fitting the conductivity formula, we can obtain a conductivity corresponding to a certain temperature and pressure. These conductivity values ​​are the conductivity values ​​under different conditions.

[0068] Therefore, we can further derive the formula for the residual between the reference conductivity and the fitted conductivity:

[0069]

[0070] The residual (error) between the baseline conductivity and the fitted conductivity is obtained using the residual formula. Further data processing can then be performed. Preferably, a neural network method can be used to learn the error. The input data for training are the voltage values ​​of each sensor, and the target output is the corresponding residual value, establishing an error correction model for a specific sea area. When new conductivity, pressure, temperature, and voltage parameters are input into this error correction model, the predicted residual can be obtained. Adding this residual to the initially fitted conductivity value yields the final conductivity after data fusion processing. Because the conductivity after fusion processing removes the influence of pressure and temperature, the obtained seawater conductivity value is more accurate.

[0071] It should be noted that the reference conductivity can be obtained by consulting relevant standards, or the detection result of the conductivity sensor can be used as the reference conductivity.

[0072] The process of detecting seawater conductivity using the seawater conductivity detection device provided by this invention is as follows:

[0073] A pressure sensor is placed in the seawater filter cover at the end of the seawater diversion pipe. Lowered to a certain depth, the pressure sensor detects the seawater pressure at the pumping point, thus determining the depth at that location. Seawater is drawn in by a pump and flows through the seawater diversion pipe, first passing through the filter cover to remove impurities such as large particles of sand, algae, and small marine animals. The seawater is then sent to a testing tank within the seawater testing chamber. Temperature and conductivity sensors in the testing tank detect the seawater temperature and conductivity. After testing, the seawater is discharged from the testing chamber through a drain outlet. The temperature and conductivity signals, along with the pressure signal, are transmitted via a signal transmission line to a multi-parameter data processing unit. This unit performs data fusion processing on the pressure, temperature, and conductivity parameters to reduce conductivity testing errors and improve detection accuracy.

[0074] Example 1

[0075] A specific embodiment of the present invention, such as Figure 1 As shown, a seawater conductivity detection device is disclosed, including a pressure sensor 1, a conductivity sensor 2, a temperature sensor 3, a multi-parameter data processing unit 4, and a seawater detection box 5. The pressure sensor 1 is located outside the seawater detection box 5 and inside the seawater. The conductivity sensor 2, the temperature sensor 3, and the multi-parameter data processing unit 4 are located inside the seawater detection box 5. The pressure sensor 1, the conductivity sensor 2, and the temperature sensor 3 are electrically connected to the multi-parameter data processing unit 4.

[0076] Compared with existing technologies, the seawater conductivity detection device provided in this embodiment uses a pressure sensor placed in the sea to detect seawater pressure. The seawater detection tank does not need to be placed in the sea; instead, seawater is drawn into the detection tank for temperature and conductivity detection. Then, a multi-parameter data processing unit is used to fuse the seawater pressure, temperature, and conductivity data. This reduces the impact of seawater on the conductivity detection device, extends the service life of the conductivity sensor, and significantly improves detection accuracy through the fusion processing of seawater pressure, temperature, and conductivity data by the multi-parameter data processing unit.

[0077] To measure the temperature and conductivity of seawater within the seawater testing tank 5, the seawater conductivity testing device also includes a testing pool 6, with a conductivity sensor 2 and a temperature sensor 3 disposed within the testing pool 6. Specifically, the testing pool 6 is located at the bottom of the seawater testing tank 5. When using the seawater conductivity testing device of this embodiment to test seawater on a ship, the testing pool 6 is fixed to the bottom of the seawater testing tank 5 to prevent the stability of the components within the testing tank 5 from being affected by the swaying of the ship.

[0078] To draw seawater into the seawater testing tank 5, the seawater conductivity testing device also includes a water pump 7, which is located inside the seawater testing tank 5 and is fixedly connected to it. The water pump 7 is connected to the testing pool 6 via a first seawater inlet pipe 8, and the seawater drawn from the sea by the water pump 7 enters the testing pool 6 through the first seawater inlet pipe 8.

[0079] Since the conductivity and temperature of seawater need to be measured in the detection pool 6 inside the seawater detection box 5, it is necessary to pump water from the sea into the detection pool 6. The water pump 7 pumps the water from the sea into the detection pool 6 through the second seawater diversion pipe 9. That is, one end of the second seawater diversion pipe 9 extends into the sea, and the other end is connected to the water pump 7 inside the seawater detection box 5. The water pump 7 is connected to the detection pool 6 through the first seawater diversion pipe 8.

[0080] In this embodiment, the seawater, under the action of the water pump 7, sequentially passes through the second seawater diversion pipe 9, the water pump 7, and the first seawater diversion pipe 8 into the detection pool 6.

[0081] Considering that seawater contains impurities such as sand, algae, and small marine organisms, when the water pump 7 draws seawater through the second seawater diversion pipe 9, it may draw these impurities into the water pump 7 and then into the detection pool 6. This will affect both the accuracy of seawater detection and the lifespan of the equipment.

[0082] To prevent the water pump 7 from sucking in debris when drawing seawater, a seawater filter cover 10 is provided at the end of the second seawater inlet pipe 9. The surface of the seawater filter cover 10 is a filter membrane with micropores. A pressure sensor 1 is installed at the position where the seawater is drawn from the seawater filter cover 10. Specifically, the pressure sensor 1 is installed at the center of the filter membrane.

[0083] Since the tested seawater needs to be drained from the seawater testing tank 5, the seawater testing tank 5 is equipped with a drain hole. Specifically, the drain hole is located at the bottom of the seawater testing tank 5. When it is necessary to replace the seawater in the testing pool 6, it is drained through the drain hole reserved on the seawater testing tank 5.

[0084] To prevent seawater from damaging the components inside the seawater testing box 5, the seawater in the testing pool 6 is discharged from the seawater testing box 5 through the third seawater drainage pipe 11. One end of the third seawater drainage pipe 11 is connected to the testing pool 6, and the other end extends out of the seawater testing box 5 through the pre-reserved drainage hole.

[0085] In this embodiment, seawater enters the testing pool 6 through the second seawater diversion pipe 9, the water pump 7, and the first seawater diversion pipe 8. After testing, the seawater in the testing pool 6 is discharged from the seawater testing box 5 through the third seawater diversion pipe 11.

[0086] Understandably, the first seawater inlet pipe 9, the second seawater inlet pipe 10, and the third seawater inlet pipe 11 are all equipped with switch valves that can close the seawater flow path. When the temperature and conductivity of the seawater are being tested, the third seawater inlet pipe 11 needs to be closed.

[0087] In this embodiment, pressure sensor 1 detects the pressure of the extracted seawater and obtains the pressure data of the seawater; temperature sensor 2 detects the temperature of the extracted seawater and obtains the temperature data of the seawater; conductivity sensor detects the conductivity of the extracted seawater and obtains the conductivity data of the seawater. The parameter data obtained by pressure sensor 1, temperature sensor 3 and conductivity sensor 2 are transmitted to multi-parameter data processing unit 4 through signal transmission line 12.

[0088] The multi-parameter data processing unit 4 is used to comprehensively process the detection data obtained by the pressure sensor 1, temperature sensor 3, and conductivity sensor 2. The application of multi-parameter data processing method can reduce the influence of seawater pressure and temperature on conductivity detection and improve detection accuracy.

[0089] The seawater conductivity detection device of this embodiment abandons the previous cumbersome and mechanically heavy structure. It is compact, small and portable, and has high measurement efficiency in seawater. It can realize the real-time detection of seawater conductivity and eliminate the influence of seawater impurities and seawater temperature on the detection of seawater conductivity, significantly improving the detection accuracy and extending the service life of the detection device.

[0090] The seawater conductivity detection device of this embodiment is simple and convenient to operate. It does not require lowering the conductivity sensor into the seawater for detection. It can directly detect the conductivity of seawater at different depths on the shore or on a boat, which reduces the impact of seawater on the components of the device and can extend the service life of the detection device.

[0091] Example 2

[0092] Another specific embodiment of the present invention discloses a method for detecting seawater conductivity, using the seawater conductivity detection device of Embodiment 1, the steps of which include:

[0093] Step 1: Place pressure sensor 1 into seawater, turn on water pump 7 to inject water into detection pool 6; at the same time, pressure sensor 1 acquires the pressure value of seawater and transmits it to multi-parameter data processing unit 4.

[0094] Step 2: When the amount of seawater in the detection pool 6 is appropriate (e.g., the seawater submerges the conductivity sensor 2 and temperature sensor 3), the water pump 7 is turned off. The conductivity sensor 2 and temperature sensor 3 acquire the conductivity and temperature data of the seawater and transmit them to the multi-parameter data processing unit 4.

[0095] Step 3: The multi-parameter data processing unit 4 performs data fusion processing on the pressure data, temperature data, and conductivity data to obtain the final conductivity value of the seawater.

[0096] Step 4: Drain the seawater from test pool 6 to complete the test.

[0097] This embodiment employs a multi-parameter data processing unit and applies a multi-parameter data processing algorithm to further improve detection accuracy.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of detecting the conductivity of seawater, characterized by, The seawater conductivity detection device comprises a pressure sensor, a conductivity sensor, a temperature sensor, a multi-parameter data processing unit, a seawater detection box, a detection pool and a water pump, the seawater detection box is not put into the sea, the pressure sensor is arranged outside the seawater detection box and located in the seawater, the conductivity sensor, the temperature sensor, the multi-parameter data processing unit, the detection pool and the water pump are arranged in the seawater detection box, the conductivity sensor and the temperature sensor are arranged in the detection pool, the water pump is used for pumping seawater from the sea into the detection pool, and the pressure sensor, the conductivity sensor and the temperature sensor are electrically connected with the multi-parameter data processing unit. The seawater conductivity detection method comprises the following steps: step 1, starting the water pump to inject water into the detection pool; at the same time, the pressure sensor obtains pressure data of the seawater and transmits the pressure data to the multi-parameter data processing unit; step 2, when the seawater in the detection pool submerges the conductivity sensor and the temperature sensor, the water pump is turned off, the conductivity sensor and the temperature sensor respectively obtain conductivity data and temperature data of the seawater and transmit the conductivity data and the temperature data to the multi-parameter data processing unit; step 3, the multi-parameter data processing unit performs data fusion processing on the pressure data, the temperature data and the conductivity data; and step 4, discharging the seawater in the detection pool to complete the detection. In the step 3, the data fusion processing method of the multi-parameter data processing unit is as follows: a sequence of reference conductivity is set, and voltage output sequences of the conductivity sensor, the temperature sensor and the pressure sensor are obtained; each correlation coefficient between the voltage output sequences of the conductivity sensor, the temperature sensor and the pressure sensor and the sequence of reference conductivity is obtained, and a grey correlation matrix established by the correlation coefficients is obtained; a fitting conductivity formula of the conductivity sensor, the temperature sensor and the pressure sensor is obtained, and the fitting conductivity formula can obtain the conductivity under different temperature and pressure conditions.

2. The method of claim 1, wherein the step of measuring the conductivity of the seawater is performed by a method comprising: The water pump and the detection pool are connected through a first seawater drainage pipe.

3. The method of claim 1, wherein the step of measuring the conductivity of the seawater is performed by a method comprising: The water pump pumps water in the sea into the seawater detection box through a second seawater drainage pipe, one end of the second seawater drainage pipe extends into the sea, and the other end of the second seawater drainage pipe is connected with the water pump.

4. The method of claim 2, wherein the step of measuring the conductivity of the seawater is performed by a method comprising: A seawater filtering cover is arranged at the end of the second seawater drainage pipe, and a filtering membrane is arranged on the surface of the seawater filtering cover.

5. The method of claim 4, wherein the step of determining the conductivity of the seawater is performed by using a conductivity meter. The pressure sensor is arranged at the center of the filtering membrane.

6. The method of claim 1, wherein, The seawater detection box is provided with a drain hole, one end of a third seawater drainage pipe is connected with the detection pool, and the other end of the third seawater drainage pipe extends out of the seawater detection box through the drain hole.

7. The method of claim 1, wherein the step of measuring the conductivity of the seawater is performed by a method comprising: The parameter data obtained by the pressure sensor, the conductivity sensor and the temperature sensor is transmitted to the multi-parameter data processing unit through a signal transmission line.

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