A multi-parameter liquid composite detection sensor, detection system and detection method

Abstract

The present invention discloses a multi-parameter composite liquid detection sensor, comprising an outer tube, an inner tube coaxially disposed within the outer tube, a gap formed between the outer and inner tube walls, a conductivity sensing electrode disposed on opposite sides of the outer tube wall, and a corresponding excitation electrode disposed on the inner side of the outer tube wall, opposite the sensing electrodes; at least two liquid level sensing electrodes disposed axially along the outer side of the inner tube wall, with a spacing between adjacent liquid level sensing electrodes; and a photoelectric liquid leakage sensor disposed at one end of the inner tube away from the base, with the detection end of the photoelectric liquid leakage sensor facing away from the base. The present invention can effectively detect multiple parameters, such as the type and rate of leakage at a leak point, with a high degree of automation, informatization, and intelligence.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid leakage detection, and in particular to a multi-parameter liquid composite detection sensor, a detection system and a detection method for ships. Background Art

[0002] Ships typically have a complex network of piping systems, which can be divided into the power system and the ship system. The power system provides propulsion and includes fuel, lubricating oil, and cooling water piping. The ship system, on the other hand, serves the entire ship, ensuring normal navigation and meeting the daily needs of the crew. It includes the bilge water system, water supply system, and anti-pollution system. During ship operation, water ingress and flooding may occur in various compartments due to impacts, corrosion, and other factors. To monitor water ingress and leakage in various compartments or piping systems in real time, leak sensors are often installed at leak-prone points or designated locations to detect leaks immediately and provide a reference for leak monitoring. However, existing liquid monitoring devices are limited in functionality and can only determine whether a leak has occurred at the site, but not the type of leaked liquid or its rate of increase. If a leak occurs, experienced personnel must conduct on-site investigations to locate the leak. This time-consuming and labor-intensive process does not meet the requirements of ship automation, informationization, and intelligent systems. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the existing technology, the technical problem to be solved by the present invention is: to provide a multi-parameter liquid composite detection sensor, detection system and detection method, which solves the technical problems that the existing leakage detection device has a single function, is difficult to detect the type, rate and other parameters of the leaked liquid at the leakage point, and has a low level of detection automation, informatization and intelligence.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A multi-parameter liquid composite detection sensor comprises a cylindrical outer cylinder, an inner cylinder coaxially arranged within the outer cylinder, a gap being provided between the outer cylinder and the inner cylinder walls, and one end of the inner cylinder being integrally connected to one end of the outer cylinder via a base; a conductivity sensing electrode is provided on each of opposite sides of the outer wall of the inner cylinder, and correspondingly, an excitation electrode opposite to the sensing electrode is provided on the inner side of the outer cylinder wall, the conductivity sensing electrode and the excitation electrode together forming a conductivity electrode sensor; at least two liquid level sensing electrodes are provided on the outer side of the inner cylinder wall along its axial direction, with a spacing between adjacent liquid level sensing electrodes, the liquid level sensing electrodes forming a liquid level sensing electrode sensor; a photoelectric liquid leakage sensor is provided at an end of the inner cylinder away from the base, the detection end of the photoelectric liquid leakage sensor facing away from the base.

[0006] As an optimization, a temperature sensor is sealed and embedded in the wall of the outer cylinder at one end away from the base.

[0007] As an optimization, the conductivity sensing electrode and the excitation electrode are both arc-shaped electrodes, which are respectively fixed on the cylinder wall of the inner cylinder and the outer cylinder away from the base, and the two conductivity sensing electrodes are of the same size, and the two excitation electrodes are of the same size.

[0008] As an optimization, the liquid level sensing electrodes are two annular electrodes, and are coaxially fixed on the outer side of the cylinder wall of the inner cylinder.

[0009] As an optimization, an air vent is provided on the wall of the outer tube at one end close to the base, and the air vent is communicated with the gap between the inner tube and the outer tube.

[0010] As an optimization, it further includes a wiring terminal, the base is threadedly connected to the wiring terminal, and the conductivity sensing electrode, excitation electrode, liquid level sensing electrode, photoelectric leakage sensor and temperature sensor are all electrically connected to the wiring terminal through lines.

[0011] Based on the above-mentioned composite sensor, the present invention also provides a multi-parameter liquid detection system, including the multi-parameter liquid composite detection sensor, and also including a lower computer transmitter and a host computer, the lower computer transmitter is respectively connected to the host computer and the multi-parameter liquid composite detection sensor; the lower computer transmitter includes an excitation source module, a power supply module and a detection circuit module, wherein the detection circuit module is respectively connected to the excitation source module, the power supply module and the multi-parameter liquid composite detection sensor.

[0012] As an optimization, the detection circuit module includes a dielectric conductivity detection unit circuit connected to the conductivity electrode sensor and the excitation source module, a liquid level sensing unit circuit connected to the liquid level sensing electrode sensor, a leakage monitoring unit circuit connected to the photoelectric leakage sensor, a temperature detection unit circuit connected to the temperature sensor, and a system communication module connected to the host computer, and the dielectric conductivity detection unit circuit, liquid level sensing unit circuit, leakage monitoring unit circuit, temperature detection unit circuit and system communication module are all connected to a microprocessor module.

[0013] As an optimization, the medium conductivity detection unit circuit includes a conductivity signal acquisition circuit, an automatic range switching circuit, a true effective value conversion circuit and an analog-to-digital conversion circuit, which are connected in sequence to the conductivity electrode sensor and the excitation source module, wherein the analog-to-digital conversion circuit is connected to the microprocessor module.

[0014] Based on the above detection system, the present invention also provides a multi-parameter liquid detection method, which uses the multi-parameter liquid detection system, including:

[0015] The system starts up and the power module supplies power to the circuits and sensors in the system.

[0016] The photoelectric leakage sensor remains in a normally open state. When the amount of light detected by the photoelectric leakage sensor changes, the leakage signal is transmitted to the microprocessor module through the leakage monitoring unit circuit. After receiving the leakage signal, the microprocessor module controls the conductivity electrode sensor, liquid level sensing electrode sensor, and temperature sensor to start working.

[0017] When the leaked liquid enters the gap between the outer and inner cylinders and submerges the conductivity sensing electrode and the excitation electrode, the conductivity signal acquisition circuit collects the inter-electrode voltage between the conductivity sensing electrodes and the current flowing through the excitation electrode, and transmits the inter-electrode voltage and current signals to the microprocessor module to determine the type of leaked liquid.

[0018] After receiving the inter-electrode voltage, the microprocessor module compares it with a preset threshold to determine whether the current range matches the inter-electrode voltage signal. If not, the microprocessor module controls the automatic range switching circuit to change the measurement range and controls the conductivity signal acquisition circuit to acquire the signal again until the acquired signal matches the measurement range.

[0019] When the leaking liquid submerges the liquid level sensing electrode, the liquid level sensing electrode sends a liquid level signal to the microprocessor module, and the microprocessor module calculates the leakage level and leakage rate by judging the signal source and the time interval between the adjacent liquid level sensing electrode signals.

[0020] The temperature sensor monitors the temperature of the outer cylinder wall in real time and transmits the temperature signal to the microprocessor module. The microprocessor module performs temperature compensation on each detection result according to the temperature signal and finally outputs the detection result to complete the multi-parameter intelligent detection of liquid leakage.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] The present invention integrates multiple parameter detection modules to form a composite sensor, and through reasonable structural design, makes each parameter detection module have a more reasonable structural layout, so as to better control the working status of each parameter detection module and obtain more accurate detection parameters, so that the microprocessor can analyze and calculate the detected parameters, thereby solving the shortcomings of existing domestic ship bottom tank liquid leakage monitoring equipment, which has a single function and lacks the ability to distinguish liquid types and liquid leakage rate. It can timely warn of various liquid leaks caused by damage, realize intelligent identification of liquid types and supporting networking throughout the ship, and realize automatic shifting operation during conductivity measurement. The present invention realizes automatic discrimination of the type of leaking liquid, reduces the difficulty of checking leakage points, and has a high degree of automation, informatization, and intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the composite detection sensor in the present invention;

[0024] Figure 2 Schematic diagram of the distribution of the excitation electrodes and the conductivity sensing electrodes in the present invention;

[0025] Figure 3 Schematic diagram of the distribution of liquid level sensing electrodes in the present invention;

[0026] Figure 4 Schematic diagram of the circuit structure of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the lower computer transmitter in the present invention;

[0028] Figure 6 for Figure 5 Rear view;

[0029] Figure 7 This is a flow chart of automatic range switching in the present invention;

[0030] In the figure, 1 is the outer cylinder, 2 is the inner cylinder, 3 is the conductivity sensing electrode, 4 is the excitation electrode, 5 is the liquid level sensing electrode, 6 is the photoelectric leakage sensor, 7 is the temperature sensor, 8 is the terminal block, and 9 is the lower computer transmitter. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings.

[0032] Specific implementation: see Figure 1-Figure 7 ,

[0033] A multi-parameter composite liquid detection sensor comprises a cylindrical outer tube 1, with an inner tube 2 coaxially disposed within the outer tube 1. A gap is defined between the outer and inner tube walls, and one end of the inner tube 2 is integrally connected to the outer tube 1 via a base. Conductivity sensing electrodes 3 are disposed on opposite sides of the outer tube wall of the inner tube 2. Correspondingly, excitation electrodes 4 are disposed on the inner side of the outer tube wall, opposite the sensing electrodes. The conductivity sensing electrodes 3 and excitation electrodes 4 together form a conductivity electrode sensor for detecting and measuring the type of leaking liquid. At least two liquid level sensing electrodes 5 are disposed axially along the outer side of the inner tube 2, with spacing between adjacent liquid level sensing electrodes 5. These liquid level sensing electrodes 5 form a liquid level sensing electrode sensor for measuring the rate of liquid rise. A photoelectric liquid leakage sensor 6 is disposed at the end of the inner tube 2 away from the base, with the detection end of the photoelectric liquid leakage sensor 6 facing away from the base, for detecting liquid leaks. A temperature sensor 7 is sealed and embedded in the wall of the outer tube 1 at the end away from the base. This sensor is used to detect the temperature of leaking liquid and facilitate subsequent temperature compensation. During use, the sensor is installed in various compartments or piping systems on the ship at locations prone to leakage. The specific location can be set according to actual conditions, preferably to detect liquid leaks immediately.

[0034] Specifically, such as Figure 1 As shown, the conductivity sensing electrode 3 and the excitation electrode 4 are both arc-shaped electrodes, fixed at the same height and coaxially on the walls of the inner and outer cylinders 2 and 1, respectively, on the ends away from the base. The two conductivity sensing electrodes 3 are identical in size and symmetrical in both directions, and the two excitation electrodes 4 are identical in size and symmetrical in both directions. The liquid level sensing electrodes 5 are two annular electrodes disposed above the conductivity sensing electrodes 3 and coaxially fixed to the outer wall of the inner cylinder 2. In this embodiment, two annular electrodes are used, located at different heights, but with a constant spacing between them. A vent hole is provided in the wall of the outer cylinder 1, near the base. The vent hole communicates with the gap between the inner and outer cylinders 2 and 1, ensuring that leaked liquid can smoothly enter the gap between the two cylinders. A terminal block 8 is also included, to which the base is threadedly connected. The conductivity sensing electrode 3, excitation electrode 4, liquid level sensing electrode 5, photoelectric leakage sensor 6, and temperature sensor 7 are all electrically connected to the terminal block 8 via wiring.

[0035] The conductivity electrode sensor and the liquid being measured form a quadrupole conductivity cell structure. The conductivity of the solution is measured by measuring the voltage between the two conductivity sensing electrodes 3 and the current flowing through the two excitation electrodes 4. Compared to a bipolar structure, this effectively reduces the influence of polarization and capacitance effects. The arrangement of the liquid level sensing electrode sensors enables liquid level sensing, thereby measuring the rate of liquid rise. Specifically, when liquid submerges the level sensing electrodes 5, a voltage is generated on the electrodes. The presence or absence of the voltage determines whether the liquid level has reached the electrode height. By calculating the time interval between the immersion of the two layers of level sensing electrodes 5, the rate of liquid rise can be estimated. The temperature sensor 7 uses an SHTC3 digital sensor that senses temperature and converts it into a usable output signal. The photoelectric leakage sensor 6 integrates a light emitter and a light receiver. When there is no liquid leakage, the light is mostly concentrated on the receiver after secondary reflection. When a liquid leak occurs, the light is secondary refracted again during secondary reflection, and most of the light is refracted away, causing the light intensity at the receiver to decrease. This change in light intensity at the receiver can be used to detect liquid leakage.

[0036] Based on the above composite sensor, the present invention also provides a multi-parameter liquid detection system, such as Figure 4 As shown, the multi-parameter liquid composite detection sensor includes the above-mentioned device, a slave device transmitter 9, and a host device. The slave device transmitter 9 is connected to the host device and the multi-parameter liquid composite detection sensor, respectively. The slave device transmitter 9 includes an excitation source module, a power supply module, and a detection circuit module, wherein the detection circuit module is connected to the excitation source module, the power supply module, and the multi-parameter liquid composite detection sensor, respectively. The excitation source module includes an excitation source generating circuit and an excitation source filtering and amplifying circuit for generating an excitation signal. The power supply module is used to power the entire device.

[0037] The detection circuit module includes a medium conductivity detection unit circuit connected to the conductivity electrode sensor and the excitation source module, a liquid level sensing unit circuit connected to the liquid level sensing electrode sensor, a leakage monitoring unit circuit connected to the photoelectric leakage sensor 6, a temperature detection unit circuit connected to the temperature sensor 7, and a system communication module connected to the host computer. The medium conductivity detection unit circuit, the liquid level sensing unit circuit, the leakage monitoring unit circuit, the temperature detection unit circuit, and the system communication module are all connected to a microprocessor (using an STM32F103RCT6 chip) module. Specifically, as Figure 5-Figure 6As shown, the lower-level transmitter 9 is constructed from ABS plastic, offering high impact resistance and mechanical strength, as well as excellent heat and low-temperature resistance and waterproofing. Its upper cover is secured with screws at the four corners to prevent dust and other debris from entering the transmitter and damaging the circuit boards. M3 screws are used to secure the insulating hardboard at the four corners of the bottom. The double-layer circuit boards are also secured with screws to prevent damage during operation or transport. A 12-core aviation plug connects the cable for the composite sensor detector from the left side of the transmitter, while single-core and 4-core aviation plugs connect the power cord and RS485 communication cable from the right side. Ample space is reserved within the transmitter for convenient wiring, merging, and routing during maintenance.

[0038] The dielectric conductivity detection unit circuit includes a conductivity signal acquisition circuit, an automatic range switching circuit, a true RMS conversion circuit, and an analog-to-digital conversion circuit, which are sequentially connected to the conductivity electrode sensor and the excitation source module. The analog-to-digital conversion circuit is connected to the microprocessor module. The conductivity signal acquisition circuit includes a current conversion circuit and a high-input impedance voltage amplifier circuit for processing the signal from the conductivity electrode sensor. The automatic range switching circuit automatically selects the appropriate range based on the acquired signal to improve signal acquisition accuracy. The true RMS conversion circuit and the analog-to-digital conversion circuit convert the acquired signal data into useful data for the microprocessor module.

[0039] The liquid level sensing unit circuit includes a voltage amplification circuit, a full-wave rectifier circuit and a comparator circuit, which are used to process and compare the voltage signals of the two liquid level sensing electrodes so that the microprocessor module can calculate the rising rate of the liquid level based on the signals.

[0040] Based on the above detection system, the present invention also provides a multi-parameter liquid detection method, which uses the multi-parameter liquid detection system, including:

[0041] The system starts up and the power module supplies power to the circuits and sensors in the system.

[0042] The photoelectric leakage sensor 6 remains in a normally open state. When the amount of light detected by the photoelectric leakage sensor 6 changes, the leakage signal is transmitted to the microprocessor module through the leakage monitoring unit circuit. After receiving the leakage signal, the microprocessor module controls the conductivity electrode sensor, liquid level sensing electrode sensor, and temperature sensor 7 to start working.

[0043] When the leaked liquid enters the gap between the outer tube 1 and the inner tube 2 and submerges the conductivity sensing electrode 3 and the excitation electrode 4, the conductivity signal acquisition circuit collects the inter-electrode voltage between the conductivity sensing electrodes 3 and the current flowing through the excitation electrode 4, and transmits the inter-electrode voltage and current signals to the microprocessor module to determine the type of leaked liquid.

[0044] After receiving the inter-electrode voltage, the microprocessor module compares it with the preset threshold value to determine whether the current range matches the inter-electrode voltage signal. If not, the automatic range switching circuit is controlled to change the measurement range, and the conductivity signal acquisition circuit is controlled to acquire the signal again until the acquired signal matches the measurement range. Specifically, the automatic range switching circuit uses a multi-way analog switch TS5A3357 to select different ranges to ensure high measurement accuracy within a conductivity measurement range with a larger span. The external resistor is divided into three gears, and the input signal can be amplified by 2 times, 10 times, and 100 times respectively. The program flow chart of the control subroutine for automatic range switching is shown as follows: Figure 7 As shown, after a conductivity signal sampling cycle is complete, the microprocessor calculates the effective value of the voltage between the two conductivity sensing electrodes 3 within the conductivity cell. This value is then compared with a set threshold to determine whether the current range is appropriate. If not, the analog electronic switch is controlled to change gears, and resampling is performed until the current range is confirmed to be optimal. The automatic range switching control subroutine controls the analog electronic switch via the microprocessor's I / O ports PB0 and PB1 to select different external resistors. The measurement range is adjusted using the interval comparison method, with three intervals set: 0-0.02V, 0.02-0.2V, and 0.2-1V, corresponding to the system's third, second, and first gears, respectively. The default range is the second middle gear during initialization, so a maximum of one range change is required during the measurement process. Since the threshold for the minimum gear is 0, a suitable range can be found during the range reduction process. If the measured voltage exceeds the threshold for the maximum gear, an overrange condition is applied.

[0045] When the leaked liquid submerges the liquid level sensing electrode 5 , the liquid level sensing electrode 5 sends a liquid level signal to the microprocessor module, which calculates the leaked liquid level and leakage rate by determining the signal source and the time interval between the signals of adjacent liquid level sensing electrodes 5 .

[0046] Since different leakage temperatures have a certain impact on the conductivity of the liquid, in order to further improve the conductivity detection of leakage, the temperature of the outer cylinder 1 wall is monitored in real time by the temperature sensor 7, and the temperature signal is transmitted to the microprocessor module. The microprocessor module performs temperature compensation on each detection result according to the temperature signal, and finally outputs a more accurate detection result, completing the multi-parameter intelligent detection of leakage.

[0047] During ship operations, the present invention was used to monitor bilge leaks and measure the conductivity, temperature, and rate of rise of the leaking liquid. The conductivity measurements were used to infer the type of leaked liquid and determine the location of the leak, saving time in troubleshooting. The liquid temperature was measured for temperature compensation, making the conductivity measurement more accurate. The rate of rise measurements were used to estimate the severity of the leak risk, providing a reference for personnel to assess the progress of leak rescue efforts.

[0048] The present invention integrates multiple parameter detection modules to form a composite sensor, and through reasonable structural design, makes each parameter detection module have a more reasonable structural layout, so as to better control the working status of each parameter detection module and obtain more accurate detection parameters, so that the microprocessor can analyze and calculate the detected parameters, thereby solving the shortcomings of existing domestic ship bottom tank liquid leakage monitoring equipment, which has a single function and lacks the ability to distinguish liquid types and liquid leakage rate. It can timely warn of various liquid leaks caused by damage, realize intelligent identification of liquid types and supporting networking throughout the ship, and realize automatic shifting operation during conductivity measurement. The present invention realizes automatic discrimination of the type of leaking liquid, reduces the difficulty of checking leakage points, and has a high degree of automation, informatization, and intelligence.

[0049] Although the embodiments of the present invention have been shown and described, it is apparent to those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and basis of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Therefore, the embodiments of the present invention are merely illustrative examples of the present invention. No matter from which point of view, the embodiments of the present invention do not constitute a limitation on the present invention.

Claims

1. A multi-parameter liquid composite detection sensor, characterized in that: The invention comprises a cylindrical outer cylinder, wherein an inner cylinder is coaxially arranged inside the outer cylinder, and a gap is provided between the cylinder walls of the outer cylinder and the inner cylinder, and one end of the inner cylinder is connected to one end of the outer cylinder via a base to form a whole; a conductivity sensing electrode is provided on each of the opposite sides of the outer wall of the inner cylinder, and correspondingly, an excitation electrode opposite to the sensing electrode is provided on the inner side of the cylinder wall of the outer cylinder, and the conductivity sensing electrode and the excitation electrode together form a conductivity electrode sensor; at least two liquid level sensing electrodes are provided on the outer side of the cylinder wall of the inner cylinder along its axial direction, and there is a gap between adjacent liquid level sensing electrodes, and the liquid level sensing electrodes form a liquid level sensing electrode sensor; a photoelectric leakage sensor is provided at the end of the inner cylinder away from the base, and the detection end of the photoelectric leakage sensor faces away from the base; A temperature sensor is sealed and embedded in the wall of the outer cylinder at one end away from the base; The conductivity sensing electrode and the excitation electrode are both arc-shaped electrodes, which are respectively fixed on the cylinder wall of the inner cylinder and the outer cylinder at one end away from the base, and the two conductivity sensing electrodes are of the same size, and the two excitation electrodes are of the same size; The liquid level sensing electrodes are two annular electrodes and are coaxially fixed on the outer side of the cylinder wall of the inner cylinder.

2. The multi-parameter liquid composite detection sensor according to claim 1, characterized in that: An air vent is provided on the wall of one end of the outer cylinder close to the base, and the air vent is communicated with the gap between the inner cylinder and the outer cylinder.

3. The multi-parameter liquid composite detection sensor according to claim 1, characterized in that: It also includes a wiring terminal, the base is threadedly connected to the wiring terminal, and the conductivity sensing electrode, excitation electrode, liquid level sensing electrode, photoelectric leakage sensor and temperature sensor are all electrically connected to the wiring terminal through circuits.

4. A multi-parameter liquid detection system, characterized in that: It comprises the multi-parameter liquid composite detection sensor as described in any one of claims 1 to 3, and also includes a lower computer transmitter and an upper computer, wherein the lower computer transmitter is respectively connected to the upper computer and the multi-parameter liquid composite detection sensor; the lower computer transmitter includes an excitation source module, a power supply module and a detection circuit module, wherein the detection circuit module is respectively connected to the excitation source module, the power supply module and the multi-parameter liquid composite detection sensor.

5. The multi-parameter liquid detection system according to claim 4, characterized in that: The detection circuit module includes a medium conductivity detection unit circuit connected to the conductivity electrode sensor and the excitation source module, a liquid level sensing unit circuit connected to the liquid level sensing electrode sensor, a leakage monitoring unit circuit connected to the photoelectric leakage sensor, a temperature detection unit circuit connected to the temperature sensor, and a system communication module connected to the host computer, and the medium conductivity detection unit circuit, the liquid level sensing unit circuit, the leakage monitoring unit circuit, the temperature detection unit circuit and the system communication module are all connected to a microprocessor module.

6. The multi-parameter liquid detection system according to claim 5, characterized in that: The medium conductivity detection unit circuit includes a conductivity signal acquisition circuit, an automatic range switching circuit, a true effective value conversion circuit and an analog-to-digital conversion circuit, which are connected in sequence to the conductivity electrode sensor and the excitation source module, wherein the analog-to-digital conversion circuit is connected to the microprocessor module.

7. A multi-parameter liquid detection method, comprising the multi-parameter liquid detection system according to any one of claims 4 to 6, characterized in that: include, The system starts up and the power module supplies power to the circuits and sensors in the system; The photoelectric leakage sensor remains in a normally open state. When the amount of light detected by the photoelectric leakage sensor changes, the leakage signal is transmitted to the microprocessor module through the leakage monitoring unit circuit. After receiving the leakage signal, the microprocessor module controls the conductivity electrode sensor, liquid level sensing electrode sensor, and temperature sensor to start working; When the leaked liquid enters the gap between the outer and inner cylinders and submerges the conductivity sensing electrode and the excitation electrode, the conductivity signal acquisition circuit collects the inter-electrode voltage between the conductivity sensing electrodes and the current flowing through the excitation electrode, and transmits the inter-electrode voltage and current signals to the microprocessor module to determine the type of leaked liquid; After receiving the inter-electrode voltage, the microprocessor module compares it with a preset threshold value to determine whether the current range matches the inter-electrode voltage signal. If not, the microprocessor module controls the automatic range switching circuit to change the measurement range and controls the conductivity signal acquisition circuit to acquire signals again until the acquired signal matches the measurement range. When the leaking liquid submerges the liquid level sensing electrode, the liquid level sensing electrode sends the liquid level signal to the microprocessor module, and the microprocessor module calculates the leaking liquid level and leakage rate by judging the signal source and the time interval between the adjacent liquid level sensing electrode signals; The temperature sensor monitors the temperature of the outer cylinder wall in real time and transmits the temperature signal to the microprocessor module. The microprocessor module performs temperature compensation on each detection result according to the temperature signal and finally outputs the detection result to complete the multi-parameter intelligent detection of liquid leakage.

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