Waterproof probe structure and method

Abstract

The invention relates to the technical field of gas detection, in particular to a water immersion prevention probe structure and method.The water immersion prevention probe structure comprises a probe shell, a probe base and a water immersion prevention device, the probe base is connected with the probe shell through threads, the probe shell is of a cylindrical tubular structure with an upper opening and a lower opening, and a steel wire gauze element is arranged at the lower end opening of the probe shell; the probe base is provided with a water immersion sensor, a temperature and humidity sensor and a thiophane electrochemical sensor, the water immersion sensor is provided with two vertical strip-shaped electrode plates, and the water immersion prevention device can form water immersion protection on the thiophane electrochemical sensor when the liquid level in the probe rises. According to the invention, an automatic water immersion protection function can be realized for the tetrahydrothiophene sensor in the multifunctional probe, and impurities on the surface of the electrode plate of the water immersion sensor can be automatically removed.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection, and in particular to a waterproof probe structure and method. Background Art

[0002] The multifunctional methane detector is an intrinsically safe detection instrument that can be used in methane gas environments. It is widely used in gas concentration detection or leakage detection in confined spaces such as petrochemicals, coal mining, metallurgy and chemical industry, and can effectively ensure the safety of workers and production equipment. The methane detector has the characteristics of high integration and multifunctional detection, which can realize methane concentration detection, tetrahydrothiophene concentration detection, temperature and humidity detection, water immersion detection, etc., and upload the detection data to the AEP platform through wireless communication.

[0003] The methane detector has a high degree of integration, with a temperature and humidity sensor, a water immersion sensor, and a tetrahydrothiophene electrochemical sensor installed in the same multifunctional probe. The water immersion sensor needs to be in contact with the liquid surface, and the tetrahydrothiophene sensor and the water immersion sensor are installed in the same probe. The tetrahydrothiophene sensor is prone to leakage and other damage after contact with water, so it is necessary to take protective measures against water immersion for the tetrahydrothiophene sensor.

[0004] On the other hand, methane detectors usually work in harsh environments. The stagnant water in the environment may contain a large amount of impurities such as mud, plant debris, etc. Since the water immersion sensor will come into contact with the stagnant water, these impurities will adhere to the surface of the water immersion sensor with the stagnant water. When the liquid level drops or the water evaporates, these impurities will accumulate on the surface of the electrode sheet, affecting the normal operation of the water immersion sensor. Summary of the invention

[0005] The present invention provides a water immersion-proof probe structure and method, which can realize an automatic water immersion protection function for a tetrahydrothiophene sensor in a multifunctional probe and can automatically remove impurities on the surface of an electrode sheet of the water immersion sensor.

[0006] This application provides the following technical solutions:

[0007] A waterproof probe structure includes a probe shell, a probe base and a waterproof device, wherein the probe base is connected to the probe shell by threads, the probe shell is a cylindrical tubular structure with upper and lower openings, and the lower end opening of the probe shell is provided with a steel wire mesh, the probe base is installed with a water immersion sensor, a temperature and humidity sensor and a tetrahydrothiophene electrochemical sensor, the water immersion sensor has two vertical strip electrode sheets, and the waterproof device can form water immersion protection for the tetrahydrothiophene electrochemical sensor when the liquid level inside the probe rises.

[0008] Technical principle: The probe structure is designed to be a detachably connected shell and a base. A variety of sensors are integrated and installed on the probe base. The various components of the probe can be maintained by quick disassembly. The structure is simple and convenient.

[0009] At the same time, the bottom of the probe is designed to be an opening with a gauze mesh, and the liquid in the external environment can enter the probe through the bottom opening for water immersion detection; an anti-immersion device is designed inside the probe to protect the tetrahydrothiophene electrochemical sensor while performing water immersion detection, thereby protecting the electrochemical sensor from being damaged by water immersion.

[0010] Beneficial effects: The quickly detachable structure is conducive to the maintenance and inspection of the various components of the probe. The probe can protect the tetrahydrothiophene electrochemical sensor while realizing water immersion detection, thereby protecting the electrochemical sensor from being damaged by water immersion.

[0011] Furthermore, the anti-immersion device is a floating block with a groove on the upper surface, the horizontal dimension of the groove is adapted to the horizontal outer dimension of the tetrahydrothiophene electrochemical sensor, the depth of the groove is not less than the height of the tetrahydrothiophene electrochemical sensor, and the density of the floating block is lower than the density of water; the probe base is a cylindrical structure with multiple sections of different diameters, including an upper section, a middle section and a lower section, the diameter of the middle section is larger than the outer diameter of the probe shell; the diameter of the lower section is the same as the inner diameter of the probe shell, and is provided with an external thread, which matches the internal thread at the upper opening of the probe shell.

[0012] Furthermore, when the liquid level inside the probe is not lower than the height of the lower surface of the tetrahydrothiophene electrochemical sensor, the upper surface of the float adheres to the lower surface of the probe base to form a closed cavity that matches the shape of the tetrahydrothiophene electrochemical sensor, and the tetrahydrothiophene electrochemical sensor is accommodated in the closed cavity.

[0013] Beneficial effect: When the liquid level rises, the groove on the upper surface of the float and the lower surface of the probe base form a closed cavity, and the tetrahydrothiophene electrochemical sensor is accommodated therein, forming an effective water immersion protection.

[0014] Furthermore, the shape of the float is semicircular, and the diameter of the float is the same as the diameter of the inner cavity of the probe housing.

[0015] Beneficial effects: The shape of the float is semicircular and its diameter is the same as the inner diameter of the probe shell. The float can be limited in the horizontal direction to prevent the float from shifting in the direction of the water surface, ensuring that the groove is aligned with the tetrahydrothiophene electrochemical sensor after the float is raised, thus avoiding water immersion caused by the tetrahydrothiophene electrochemical sensor not being able to enter the groove due to position deviation. On the other hand, there is no float blocking the side close to the electrode sheet, which can ensure stable internal exhaust and decompression, which is beneficial to the stable operation of the float.

[0016] Furthermore, the float is circular in shape, and its diameter is the same as the diameter of the inner cavity of the probe housing. Two strip-shaped through grooves are provided on the right side of the float, and the size of the through grooves matches the cross-sectional size of the electrode sheet of the water immersion sensor. A layer of hard waterproof material is coated on the inner side of the through grooves, and the electrode sheet of the water immersion sensor passes through the strip-shaped through grooves.

[0017] Beneficial effect: The shape of the floating block is improved to a circle and an impurity removal device is added. As the liquid level changes, the hard edge on the inside of the through groove contacts the surface of the electrode sheet and moves along the direction of the electrode sheet, which can effectively remove impurities accumulated on the surface of the electrode sheet.

[0018] In another aspect, the present invention provides a method for preventing a probe from being flooded, comprising the following steps:

[0019] S1. A water-proof device is arranged inside the probe housing, and the water-proof device can provide water immersion protection for the tetrahydrothiophene electrochemical sensor when the liquid level inside the probe rises; wherein the probe housing is a cylindrical tubular structure with upper and lower openings, and a steel wire mesh is arranged at the lower opening of the probe housing, and the probe base is connected to the probe housing by threads, and a water immersion sensor, a temperature and humidity sensor and a tetrahydrothiophene electrochemical sensor are installed on the probe base, and the water immersion sensor has two vertical strip electrodes;

[0020] S2. When liquid in the environment enters the interior of the probe, the waterproof device moves toward the tetrahydrothiophene electrochemical sensor as the liquid level rises, preventing the tetrahydrothiophene electrochemical sensor from contacting the liquid.

[0021] Further, in S1, the anti-immersion device is a floating block with a groove on the upper surface, the horizontal dimension of the groove is adapted to the horizontal outer dimension of the tetrahydrothiophene electrochemical sensor, the depth of the groove is not less than the height of the tetrahydrothiophene electrochemical sensor, and the density of the floating block is lower than the density of water; the probe base is a cylindrical structure with multiple sections of different diameters, including an upper section, a middle section and a lower section, the diameter of the middle section is larger than the outer diameter of the probe shell; the diameter of the lower section is the same as the inner diameter of the probe shell, and is provided with an external thread, which matches the internal thread at the opening at the upper end of the probe shell.

[0022] Furthermore, in S2, when the liquid level inside the probe is not lower than the height of the lower surface of the tetrahydrothiophene electrochemical sensor, the upper surface of the float adheres to the lower surface of the probe base to form a closed cavity that matches the shape of the tetrahydrothiophene electrochemical sensor, and the tetrahydrothiophene electrochemical sensor is accommodated in the closed cavity.

[0023] Furthermore, the shape of the float is semicircular, and the diameter of the float is the same as the diameter of the inner cavity of the probe housing.

[0024] Furthermore, the S1 is also provided with an impurity removal device on the floating block, the shape of the floating block is circular, the diameter of the floating block is the same as the diameter of the inner cavity of the probe housing, the impurity removal device is two strip-shaped through grooves provided on the floating block, the size of the through grooves matches the cross-sectional size of the electrode sheet of the water immersion sensor, the inner side of the through grooves is coated with a layer of hard waterproof material, and the electrode sheet of the water immersion sensor passes through the strip-shaped through grooves;

[0025] The step S2 also includes that the impurity removing device moves on the surface of the electrode sheet as the liquid level changes, so as to remove impurities on the surface of the electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a methane detector;

[0027] Figure 2 This is a schematic diagram of the waterproof probe structure of the first embodiment;

[0028] Figure 3 This is a schematic diagram of a floating block according to the second embodiment. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The marks in the drawings of the specification include: shell base 1, shell blind cover 2, nameplate 3, methane probe 4, multi-function probe 5, NB-LOT antenna 6, GPS-Bluetooth two-in-one antenna 7, upper section 8, lower section 9, tetrahydrothiophene sensor 10, water immersion sensor 11, floating block 12, pressure relief vent 13, and wire mesh 14.

[0031] Embodiment 1

[0032] This embodiment provides a waterproof probe structure suitable for a multifunctional methane detector.

[0033] The multifunctional methane detector of this embodiment has the characteristics of compact structure and high integration, and can realize methane concentration detection, tetrahydrothiophene concentration detection, temperature and humidity detection, water immersion detection, etc., and upload the detection data to the monitoring platform via wireless communication.

[0034] The structure of the methane detector is as follows Figure 1 As shown, it includes an explosion-proof housing, a control unit, a battery, an antenna, a methane probe 4 and a multi-function probe 5.

[0035] The explosion-proof housing includes a housing base 1 and a housing blind cover 2. The housing base 1 and the housing blind cover 2 are made of ABS material, which has good flame retardant and waterproof properties and high structural strength.

[0036] The top of the housing base 1 is a horizontal plane for fixing the nameplate 3 of the detector. Antenna compartments are provided on both sides of the top of the base, with the NB-LOT antenna 6 installed in the left antenna compartment and the GPS-Bluetooth two-in-one antenna 7 installed in the right antenna compartment. The housing of the antenna compartment is made of ABS material and is connected to the housing base 1 by threads.

[0037] A horizontal cylindrical cavity is provided on the left side of the side of the shell base 1, a horizontal annular external thread is provided on the side of the shell base 1, and a matching annular internal thread is provided on the bottom surface of the circular shell blind cover 2. The shell blind cover 2 is detachably connected to the shell base 1 through threads to form a closed main engine compartment space. The top surface of the shell blind cover 2 is evenly provided with multiple raised wings along the outer circumference, and slots are provided between the wings to facilitate the operator to hold the blind cover. A mounting plate is provided on the right side of the side of the shell base 1, including 3 triangular support plates arranged at 120 degrees apart, and each triangular support plate is provided with a mounting hole, through which the methane detector can be vertically fixed to the target installation environment.

[0038] A vertical bracket is provided in the main compartment space, and the vertical bracket divides the space of the main compartment into two parts vertically, which are used to install the control module and the battery respectively. The control module part includes a main controller, a storage unit, a data processing unit, a timing unit and a communication unit. Among them, the main controller is used to realize the system control function of the multifunctional methane detector, including the power-on and power-off management of the detection module and the antenna, the data reporting management, the self-test of the detector, etc. In this embodiment, the main controller can be implemented by PLC or a single-chip microcomputer, and preferably a 96 series single-chip microcomputer can be used to design the corresponding control function. The storage unit is used to store the data obtained by the methane sensor and the multifunctional sensor, as well as the preset thresholds of various detection data. The data processing unit is used to receive the collected data of the methane sensor and the multifunctional sensor, and compare it with the preset threshold of the corresponding data. When the collected data exceeds the threshold, the data processing unit outputs an over-threshold signal to the main controller. The timing unit includes a positioning cycle management function, a timing function and a restart time setting function, manages the positioning cycle and detection frequency of the GPS module, and sends a restart sensor signal to the main controller after reaching the preset restart time. When the gas detection concentration in the environment exceeds the detection threshold, the timing unit sets a shorter detection interval to increase the detection frequency; when the gas detection concentration in the environment does not exceed the detection threshold, the timing unit sets a normal detection interval to reduce system power consumption. A wiring channel is provided between the main unit compartment and the antenna compartments on both sides of the top. The communication unit is electrically connected to the NB-LOT antenna 6 and the GPS-Bluetooth two-in-one antenna 7 respectively, and completes the GPS positioning and data reporting functions according to the enable signal of the main controller.

[0039] The battery of the methane detector is lithium thionyl chloride battery, which has high energy density, long life, wide applicable temperature range and low self-discharge rate, making it very suitable for the working environment of the methane detector. In order to further improve the endurance of the methane detector, the detector is designed to work in an intermittent mode.

[0040] The lower part of the detector housing base 1 is provided with an annular methane module interface and a multifunctional probe interface, which are respectively provided with internal threads for connecting the methane probe 4 and the multifunctional probe 5. A laser methane sensor is installed in the methane probe 4, which detects the methane concentration in the air through the interaction between the laser of a specific wavelength and the methane molecules. The multifunctional probe 5 detects the tetrahydrothiophene concentration, the ambient temperature and humidity, and the water immersion state.

[0041] The multifunctional probe 5 includes a probe housing, a probe base, a waterproof device and a pressure relief device, and its structure is as follows: Figure 2 shown.

[0042] The probe housing is a cylindrical tubular structure with openings at the upper and lower ends. A fixedly connected steel wire mesh 14 is provided at the opening at the lower end of the probe housing. External liquid can enter the probe cavity through the steel wire mesh 14, and larger particles of impurities in the liquid are filtered out by the steel wire mesh 14. A plurality of symmetrically distributed decompression vents 13 are provided at the lower end of the probe housing. An internal thread is provided at the opening at the upper end of the probe housing, and the probe base is detachably connected to the probe housing through an external thread, so that the interior of the multifunctional probe 5 and various sensors can be easily maintained.

[0043] The probe base is a cylindrical structure with multiple sections of different diameters, including an upper section 8, a middle section and a lower section 9. The diameter of the upper section 8 is the same as the inner diameter of the multifunctional probe interface, and is provided with an external thread for connecting the multifunctional probe 5 with the detector body; the diameter of the middle section is larger than the outer diameter of the probe housing; the diameter of the lower section 9 is the same as the inner diameter of the probe housing, and is provided with an external thread, which matches the internal thread at the upper opening of the probe housing, and is used to connect the probe base with the probe housing. After the probe base is connected to the probe housing by threads, the upper opening of the probe housing is closed by the middle section of the probe base. A tetrahydrothiophene concentration sensor 10, a temperature and humidity sensor and a water immersion sensor 11 are installed on the bottom surface of the lower section 9. The tetrahydrothiophene concentration sensor 10 is located on the left side of the bottom surface and adopts an electrochemical sensor; the water immersion sensor 11 is located on the right side of the bottom surface and adopts a capacitive sensor, including two vertically arranged electrode sheets. The center of the upper section 8 and the middle section of the probe base is provided with a wiring through hole for passing the power supply and data lines of various sensors. Various sensors are electrically connected to the data processing unit of the control module.

[0044] In this example, the tetrahydrothiophene concentration sensor 10 adopts an electrochemical sensor, which has the characteristics of high sensitivity, low cost and low power consumption. However, if it contacts external liquid, it may leak and cause damage. For this reason, this embodiment sets a waterproof device inside the multifunctional probe, as shown in the following figure. Figure 2 As shown. A float 12 is provided between the tetrahydrothiophene concentration sensor 10 and the steel wire mesh 14. The float 12 is semicircular, and its diameter is the same as the diameter of the inner cavity of the probe housing. It is made of hard material and its density is lower than the density of water. The upper surface of the float 12 is provided with a groove matching the outer dimensions of the tetrahydrothiophene sensor 10, and the depth of the groove is not less than the height of the tetrahydrothiophene sensor 10. When liquid enters the interior of the probe, the float 12 rises due to the buoyancy. When the float rises to or exceeds the lower surface position of the tetrahydrothiophene sensor 10, the tetrahydrothiophene sensor 10 is accommodated in the groove of the float and will not come into contact with the liquid, thereby forming a protection for the tetrahydrothiophene sensor 10.

[0045] The shape of the float block 12 is semicircular, and its diameter is the same as the inner diameter of the probe housing. In this way, the probe housing can limit the float block in the horizontal direction to prevent the float block from shifting in the direction of the water surface, and ensure that the groove position of the float block is aligned with the tetrahydrothiophene electrochemical sensor after the float block is raised, so as to avoid water immersion caused by the tetrahydrothiophene electrochemical sensor not being able to enter the groove due to position deviation.

[0046] At the same time, in order to further improve the positioning accuracy of the float 12, multiple magnetic connection points can be set on the upper surface of the float 12 and the lower surface of the lower section 9 of the probe base, and the magnetic points on the float 12 have different polarities from the magnetic connection points of the lower section 9 of the probe base. When the liquid level rises, the float 12 is combined with the magnetic force and the buoyancy to fit with the lower surface of the probe base to form a water immersion protection space; when the liquid level drops, the magnetic connection force is less than the gravity of the float 12, and the float 12 will be out of contact with the probe base, and the tetrahydrothiophene sensor 10 can normally contact with the outside air for detection.

[0047] Embodiment 2

[0048] In actual use environment, the liquid in the environment may contain a variety of impurities. For example, rainwater or accumulated water after geological disasters may contain a large amount of silt or plant particles. These impurity particles cannot be filtered out by the wire mesh 14 and come into contact with the electrode sheet of the water immersion sensor 11. When the liquid level drops or the methane detector changes the use environment, some silt particles will remain on the surface of the electrode sheet and affect the test of the water immersion sensor.

[0049] Therefore, the present embodiment further improves the floating block 12. The shape of the floating block 12 is as follows: Figure 3As shown, the overall shape of the floating block 12 is circular, and its diameter is the same as the inner diameter of the multifunctional probe 5. Two strip-shaped through grooves are provided on the right side for passing the electrode sheet of the water immersion sensor 11. The size of the through groove is the same as the cross-sectional size of the electrode sheet, and a layer of hard waterproof material is coated on the inner side of the through groove. A tetrahydrothiophene sensor protection groove is provided on the left side of the upper surface of the floating block. The shape of the groove is the same as the shape of the tetrahydrothiophene sensor 10 and the depth is greater than the height of the tetrahydrothiophene sensor 10.

[0050] When the liquid level inside the multifunctional probe 5 changes, the floating block 12 moves up and down along the surface of the electrode sheet under the influence of the change in buoyancy, and the inner surface of the through groove contacts the surfaces of the two electrode sheets and scrapes off the foreign particles adhering to the surfaces of the electrode sheets, thereby completing the automatic cleaning of the surfaces of the electrode sheets.

[0051] Embodiment 3

[0052] A method for preventing a probe from being flooded, comprising the following steps:

[0053] S1. An anti-immersion device is arranged inside the probe shell, wherein the probe shell is a cylindrical tubular structure with upper and lower openings, a steel mesh is arranged at the lower opening of the probe shell, the probe base is connected to the probe shell by threads, a water immersion sensor, a temperature and humidity sensor and a tetrahydrothiophene electrochemical sensor are installed on the probe base, and the water immersion sensor has two vertical strip electrodes; the anti-immersion device can form water immersion protection for the tetrahydrothiophene electrochemical sensor when the liquid level inside the probe rises.

[0054] Among them, the anti-immersion device is a floating block with a groove on the upper surface. The horizontal dimension of the groove is adapted to the horizontal dimension of the tetrahydrothiophene electrochemical sensor. The depth of the groove is not less than the height of the tetrahydrothiophene electrochemical sensor. The density of the floating block is lower than the density of water. The shape of the floating block is semicircular, and the diameter of the floating block is the same as the diameter of the inner cavity of the probe shell. The probe base is a cylindrical structure with multiple sections of different diameters, including an upper section, a middle section and a lower section. The upper section is provided with an external thread for connecting the methane detector body. The diameter of the middle section is larger than the outer diameter of the probe shell to form a closure for the shell opening. The diameter of the lower section is the same as the inner diameter of the probe shell, and is provided with an external thread, which matches the internal thread at the upper opening of the probe shell.

[0055] S2. When the liquid in the environment enters the interior of the probe, the waterproof device moves toward the tetrahydrothiophene electrochemical sensor as the liquid level rises, forming a waterproof structure.

[0056] When the liquid level inside the probe is not lower than the height of the lower surface of the tetrahydrothiophene electrochemical sensor, the upper surface of the float adheres to the lower surface of the probe base to form a closed cavity that matches the shape of the tetrahydrothiophene electrochemical sensor, and the tetrahydrothiophene electrochemical sensor is accommodated in the closed cavity.

[0057] Embodiment 4

[0058] This embodiment is improved on the basis of the third embodiment:

[0059] S1, further comprising arranging an impurity removal device on the floating block:

[0060] The shape of the float block is circular, and the diameter of the float block is the same as the diameter of the inner cavity of the probe housing. Two strip-shaped through grooves are provided on the float block for passing the electrode sheet. The size of the through grooves matches the cross-sectional size of the electrode sheet. The inner side of the through grooves is coated with a layer of hard waterproof material, such as polyimide material.

[0061] S2, also includes an impurity removal device to remove impurities on the surface of the electrode sheet as the liquid level changes.

[0062] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A waterproof probe structure, comprising a probe housing and a probe base, wherein the probe base is connected to the probe housing by threads, the probe housing is a cylindrical tubular structure with upper and lower openings, the lower opening of the probe housing is provided with a steel wire mesh, the probe base is provided with a water immersion sensor, a temperature and humidity sensor and a tetrahydrothiophene electrochemical sensor, the water immersion sensor has two vertical strip electrodes, and is characterized in that: It also includes a water immersion prevention device, which can provide water immersion protection for the tetrahydrothiophene electrochemical sensor when the liquid level inside the probe rises.

2. A waterproof immersion probe structure according to claim 1, characterized in that: The anti-immersion device is a floating block with a groove on the upper surface, the horizontal dimension of the groove is adapted to the horizontal outer dimension of the tetrahydrothiophene electrochemical sensor, the depth of the groove is not less than the height of the tetrahydrothiophene electrochemical sensor, and the density of the floating block is lower than the density of water; the probe base is a cylindrical structure with multiple sections of different diameters, including an upper section, a middle section and a lower section, the diameter of the middle section is larger than the outer diameter of the probe shell; the diameter of the lower section is the same as the inner diameter of the probe shell, and is provided with an external thread, which matches the internal thread at the upper opening of the probe shell.

3. The waterproof immersion probe structure according to claim 2, characterized in that: When the liquid level inside the probe is not lower than the height of the lower surface of the tetrahydrothiophene electrochemical sensor, the upper surface of the float adheres to the lower surface of the probe base to form a closed cavity that matches the shape of the tetrahydrothiophene electrochemical sensor, and the tetrahydrothiophene electrochemical sensor is accommodated in the closed cavity.

4. The waterproof immersion probe structure according to claim 3, characterized in that: The shape of the floating block is semicircular, and the diameter of the floating block is the same as the diameter of the inner cavity of the probe housing.

5. The waterproof immersion probe structure according to claim 3, characterized in that: The float is circular in shape, and its diameter is the same as the diameter of the inner cavity of the probe housing. Two strip-shaped through grooves are provided on the right side of the float. The size of the through grooves matches the cross-sectional size of the electrode sheet of the water immersion sensor. A layer of hard waterproof material is coated on the inner side of the through grooves, and the electrode sheet of the water immersion sensor passes through the strip-shaped through grooves.

6. A method for preventing a probe from being flooded, characterized in that: The following steps are involved: S1. A water-proof device is arranged inside the probe housing, and the water-proof device can provide water immersion protection for the tetrahydrothiophene electrochemical sensor when the liquid level inside the probe rises; wherein the probe housing is a cylindrical tubular structure with upper and lower openings, a steel wire mesh is arranged at the lower opening of the probe housing, the upper end of the probe housing is connected to the probe base through a thread, a water immersion sensor, a temperature and humidity sensor and a tetrahydrothiophene electrochemical sensor are installed on the probe base, and the water immersion sensor has two vertical strip electrodes; S2. When liquid enters the interior of the probe, the waterproof device moves toward the tetrahydrothiophene electrochemical sensor as the liquid level rises, preventing the tetrahydrothiophene electrochemical sensor from contacting the liquid.

7. A method for preventing a probe from being submerged in water according to claim 6, characterized in that: In S1, the anti-immersion device is a floating block with a groove on the upper surface, the horizontal dimension of the groove is adapted to the horizontal outer dimension of the tetrahydrothiophene electrochemical sensor, the depth of the groove is not less than the height of the tetrahydrothiophene electrochemical sensor, and the density of the floating block is lower than the density of water; the probe base is a cylindrical structure with multiple sections of different diameters, including an upper section, a middle section and a lower section, the diameter of the middle section is larger than the outer diameter of the probe shell; the diameter of the lower section is the same as the inner diameter of the probe shell, and is provided with an external thread, which matches the internal thread at the upper opening of the probe shell.

8. A method for preventing a probe from being submerged in water according to claim 7, characterized in that: In S2, when the liquid level inside the probe is not lower than the height of the lower surface of the tetrahydrothiophene electrochemical sensor, the upper surface of the float adheres to the lower surface of the probe base to form a closed cavity that matches the shape of the tetrahydrothiophene electrochemical sensor, and the tetrahydrothiophene electrochemical sensor is accommodated in the closed cavity.

9. A method for preventing a probe from being immersed in water according to claim 8, characterized in that: The shape of the floating block is semicircular, and the diameter of the floating block is the same as the diameter of the inner cavity of the probe housing.

10. A method for preventing a probe from being submerged in water according to claim 8, characterized in that: The S1 also has an impurity removal device on the floating block. The floating block is circular in shape, and the diameter of the floating block is the same as the diameter of the inner cavity of the probe housing. The impurity removal device is two strip-shaped through grooves arranged on the floating block. The size of the through grooves matches the cross-sectional size of the electrode sheet of the water immersion sensor. The inner side of the through grooves is coated with a layer of hard waterproof material, and the electrode sheet of the water immersion sensor passes through the strip-shaped through grooves. The step S2 also includes that the impurity removing device moves on the surface of the electrode sheet as the liquid level changes, so as to remove impurities on the surface of the electrode sheet.

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