A novel level sensor with multiple mounting methods

Abstract

This utility model discloses a novel level sensor with multiple mounting methods. The sensor comprises, from top to bottom, a cable insert, a circuit section, a lower housing, and a sensing electrode. The sensing electrode has a hollow structure. The cable insert, circuit section, and detection mechanism are sequentially connected for signal transmission. The circuit section is sealed to the outer periphery by an upper housing. An installation hole is provided at the top of the upper housing, through which the cable insert passes, with an interference fit between the cable insert and the upper housing. An installation pipe is provided on the outer wall of the upper housing, and an internal thread is provided on the inner wall of the installation pipe near the bottom. An LED indicator is installed at the bottom of the cable insert. This utility model achieves high-level installation of the level sensor through the internal thread of the installation pipe and the external thread of the lower housing. A cleaning mechanism can clean the outer surface of the sensing electrode in real time, preventing material from adhering to the surface of the sensing electrode, preventing false triggering, and improving measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of material level sensor technology, and in particular to a novel material level sensor with multiple fixed installation methods. Background Technology

[0002] A level sensor is a sensor used to detect and measure the height or volume of materials in equipment such as hoppers, storage tanks, and warehouses. With the continuous improvement of industrial automation, the demand for material detection technology is increasing. Level sensors are widely used in various storage tanks, hoppers, and warehouse management to accurately measure the height and volume of materials and ensure the stability and safety of the production process. Therefore, a new type of level sensor with multiple fixed installation methods is needed.

[0003] A search revealed that Chinese utility model patent CN214748287U discloses a novel level sensor. The sensor comprises, from top to bottom, a cable insert, a circuit section, and a detection mechanism, all sequentially connected by signals. A top shell is sealed around the circuit section, and the top of the top shell has a mounting hole through which the cable insert passes, providing an interference fit. An LED indicator is located at the bottom of the cable insert. Several through holes are formed on the side wall of the top shell, and the LED indicator is connected to the circuit section. The light from the LED indicator shines through the through holes to indicate the detection result. This design solves the problems of complex encapsulation structures, large size, and inability to directly observe material detection results in current level sensors.

[0004] However, the above-mentioned technical solutions require side mounting during use. Many industrial applications require sensors to be installed at different heights and positions to adapt to the characteristics of various equipment and materials. However, the limitations of side mounting cannot meet these high-level mounting requirements, causing users to face difficulties in designing and arranging the system, reducing its practicality. In addition, traditional level sensors do not consider self-cleaning functions, which means that when measuring highly concentrated or viscous liquids, the liquid can easily adhere to the surface of the sensor's sensing electrode. This can cause the sensor to make incorrect judgments, resulting in inaccurate measurements and even false triggering. Moreover, traditional level sensors usually cannot adjust their position and height. This shortcoming requires users to be very careful during the initial installation to ensure the sensor's measurement range and accuracy. As the production process changes or the material characteristics are adjusted, users often need to fine-tune the sensor's installation height. However, the design of traditional sensors does not support this flexibility, making the adjustment of the overall system complex and difficult. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art and to propose a new type of material level sensor with multiple fixed installation methods.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel level sensor with multiple mounting methods is disclosed. The sensor comprises, from top to bottom, a cable insert, a circuit section, a lower housing, and a sensing electrode, with the sensing electrode having a hollow structure. The cable insert, circuit section, and detection mechanism are sequentially connected for signal transmission. An upper housing is sealed around the outer periphery of the circuit section. An installation hole is provided at the top of the upper housing, through which the cable insert passes, with an interference fit between the cable insert and the upper housing. An installation pipe is provided on the outer wall of the upper housing, and an internal thread is provided on the inner wall of the installation pipe near the bottom. An LED indicator is installed at the bottom of the cable insert. The upper housing... Multiple circular holes are provided at corresponding positions on the wall. The LED indicator is electrically connected to the circuit. A cleaning mechanism for cleaning the sensing electrode is provided on the outer wall of the sensing electrode. Two circular grooves are symmetrically provided on the bottom of the lower shell. A moving mechanism for moving the sensing electrode is provided inside each of the two circular grooves. During use, the high-position installation requirement of the level sensor can be achieved by setting the internal thread of the installation pipe and the external thread of the lower shell. The cleaning mechanism can clean the outer surface of the sensing electrode in real time to prevent material from adhering to the surface of the sensing electrode, prevent false triggering, and improve measurement accuracy.

[0008] As a further embodiment of this utility model, the top of the upper shell is a cylindrical boss structure, the mounting hole is a through hole of the boss structure, and multiple evenly distributed circular holes are opened on the side wall of the boss structure for the circular groove to transmit light evenly in four directions. The light of the LED indicator light is used to output the detection result after passing through the circular holes, so that the material detection situation can be observed intuitively by humans, thereby improving the detection efficiency.

[0009] As a further embodiment of this utility model, the lower shell contains a probe, a measuring electrode, and a sensing electrode installed sequentially. The top of the measuring electrode has a boss structure, and a sealing ring is fitted onto the side wall of the boss, fitting the lower shell. The outer side wall of the lower shell has an external thread, and the internal thread of the mounting pipe and the external thread of the lower shell are threaded together. The top of the lower shell is fitted inside the upper shell, and the lower shell and the upper shell are interference-fitted. A sealing gasket is installed between the lower shell and the upper shell. The mounting pipe and the upper shell can be installed and fixed through the internal thread of the mounting pipe and the external thread of the lower shell, facilitating high-level installation of the level sensor by the customer. The sealing gasket provides a waterproof and dustproof sealing effect.

[0010] As a further embodiment of this utility model, the novel level sensor also includes two semi-circular circuit fixing components. Each of the two circuit fixing components has a bayonet on its sidewall that matches the shape of the circuit section. The two circuit fixing components are respectively fixed to the inner sidewall of the upper shell, and each circuit fixing component abuts against the circuit section through the two bayonet. The circuit section includes a power supply circuit, a measurement circuit, an oscillation circuit, an F / V conversion circuit, a hysteresis comparator, an A / D converter, a D / A conversion circuit, an MCU processor, a voltage feedback loop, a switch output circuit, a protection circuit, a status indication unit, and a non-contact sensor. The input I / O of the MCU processor is connected to the non-contact sensor signal. The measuring electrode is electrically connected to the measurement circuit. The non-contact sensor senses the presence or absence of a magnetic object, thereby generating high and low levels, realizing automatic setting of sensor parameters and achieving intelligent learning function. That is, the non-contact sensor is equipped with a learning function, which can be used to adjust the specific working state. The learning function enables it to automatically learn and shield background interference, making the level sensor detection more convenient and the detection results more accurate, avoiding errors and inconveniences caused by manual adjustment.

[0011] As a further embodiment of this invention, the LED indicator is electrically connected to the status indicator unit. The LED indicator is red and green dual-color. The output I / O of the MCU processor is connected to the red and green dual-color LED status indicator through a current-limiting resistor, so as to output indication through different colored lights. That is, the LED status indicator is used to indicate the working status of the material level sensor, so that the operator can more intuitively observe the material detection status.

[0012] As a further embodiment of this utility model, the cleaning mechanism includes an annular seat, which is sleeved on the outer wall of the sensing electrode. The annular seat has a hollow structure, and multiple curved tubes are arranged in a circular pattern at equal intervals at the bottom of the annular seat. A flexible tube is arranged through the outer wall of the annular seat, and one end of the flexible tube passes through the inside of the installation pipe and exits from the top of the installation pipe. A first solenoid valve is installed on the outer wall of the flexible tube. A fan is pre-connected to one end of the flexible tube. At this time, the power switch of the first solenoid valve is turned on and the power switch of the second solenoid valve is turned off, and the fan is driven to blow outside air into the annular seat through the flexible tube and onto the surface of the sensing electrode through the multiple curved tubes. This can effectively prevent material from adhering to the surface of the sensing electrode, avoid accidental contact, and improve the accuracy of measurement.

[0013] As a further embodiment of this utility model, the moving mechanism includes two sleeves, each sleeve being installed inside two circular grooves. Circular blocks are slidably connected to the inner walls of each sleeve, and connecting rods are fixed to the bottom of each circular block. One end of each connecting rod passes through the bottom of the two sleeves, and one end of each connecting rod is fixed to the top of the sensing electrode. Springs are fitted onto the side walls of each connecting rod. An annular tube is provided at the top of the annular seat. Two second branch tubes are symmetrically installed on the side walls of the annular tube, and each second branch tube communicates with the two sleeves. A first branch tube is installed on the outer wall of the annular tube, and the annular tube communicates with a flexible hose. A second solenoid valve is installed on the outer wall of the first branch tube. When the power switch of the first solenoid valve is closed and the power switch of the second solenoid valve is turned on, air enters the annular tube through the first branch tube and then enters the two sleeves through the two second branch tubes, gradually increasing the pressure inside the two sleeves. This pushes the two circular blocks downwards along the inner walls of the two sleeves, thereby moving the two connecting rods downwards, thus achieving height adjustment of the sensing electrode. The operation is simple and convenient.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. During use, this equipment can achieve the high-position installation requirement of the level sensor by setting the internal thread of the installation pipe and the external thread of the lower shell.

[0016] 2. The cleaning mechanism can clean the outer surface of the sensing electrode in real time, preventing material from adhering to the surface of the sensing electrode, preventing accidental touch, and improving measurement accuracy.

[0017] 3. The position and height of the sensing electrode can be finely adjusted through the moving mechanism, which further improves the measurement range and accuracy of the sensor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a novel material level sensor with multiple fixing methods proposed in this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the installation pipeline for a novel material level sensor with multiple fixing methods proposed in this utility model.

[0020] Figure 3 This is an exploded structural diagram of a novel level sensor with multiple fixing methods proposed in this utility model.

[0021] Figure 4 This is a cross-sectional view of the upper and lower shells of a novel level sensor with multiple fixing methods proposed in this utility model.

[0022] Figure 5for Figure 4 Enlarged view at point A;

[0023] Figure 6 This is a schematic cross-sectional view of the lower shell of a novel material level sensor with multiple fixing methods proposed in this utility model;

[0024] Figure 7 This is a schematic cross-sectional view of the sleeve of a novel material level sensor with multiple fixing methods proposed in this utility model;

[0025] Figure 8 This is a schematic diagram of the cleaning mechanism and moving mechanism of a novel material level sensor with multiple fixing methods proposed in this utility model;

[0026] Figure 9 The structural block diagram of 9 is for a novel material level sensor with multiple fixed installation methods proposed in this utility model.

[0027] In the diagram: 1. Installation pipe; 2. Induction electrode; 3. Ring seat; 4. Flexible hose; 5. Cable connector; 6. Upper shell; 7. Circular hole; 8. Circuit fixing component; 9. Circuit part; 10. Sealing gasket; 11. Lower shell; 12. Measuring electrode; 13. Sleeve; 14. Sealing ring; 15. LED indicator; 16. Circular groove; 17. Ring tube; 18. Second branch tube; 19. First branch tube; 20. Second solenoid valve; 21. Circular block; 22. Connecting rod; 23. Spring; 24. Bend; 25. First solenoid valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Reference Figure 1 - Figure 9A novel level sensor with multiple fixed installation methods is disclosed. The level sensor comprises, from top to bottom, a cable insert 5, a circuit section 9, a lower housing 11, and a sensing electrode 2, with the sensing electrode 2 having a hollow structure. The cable insert 5, circuit section 9, and detection mechanism are sequentially connected for signal transmission. An upper housing 6 is sealed around the outer periphery of the circuit section 9. An installation hole is provided at the top of the upper housing 6, through which the cable insert 5 passes, and the cable insert 5 is press-fitted with the upper housing 6. An installation pipe 1 is provided on the outer wall of the upper housing 6, and an internal thread is provided on the inner wall of the installation pipe 1 near the bottom. An LED indicator 15 is installed at the bottom of the cable insert 5, and corresponding LED indicators are provided on the side walls of the upper housing 6. Multiple circular holes 7 are provided at the location. LED indicator 15 is electrically connected to the circuit part 9. A cleaning mechanism for cleaning the sensing electrode 2 is provided on the outer wall of the sensing electrode 2. Two circular grooves 16 are symmetrically provided at the bottom of the lower shell 11. Each of the two circular grooves 16 is provided with a moving mechanism for moving the sensing electrode 2. During use, the high-position installation requirement of the level sensor can be achieved by setting the internal thread of the installation pipe 1 and the external thread of the lower shell 11. The cleaning mechanism can clean the outer surface of the sensing electrode 2 in real time to prevent material from adhering to the surface of the sensing electrode 2, prevent false triggering, and improve measurement accuracy.

[0030] In this embodiment, the top of the upper shell 6 is a cylindrical boss structure, the mounting hole is a through hole of the boss structure, and multiple evenly distributed round holes 7 are opened on the side wall of the boss structure, so that the circular groove 16 can transmit light evenly in four directions. The light of the LED indicator 15 is used to output the detection result after passing through the round hole 7, so that the material detection situation can be observed intuitively by humans, thereby improving the detection efficiency.

[0031] In this embodiment, the lower shell 11 is provided with a probe, a measuring electrode 12 and a sensing electrode 2 installed thereon. The top of the measuring electrode 12 is a boss structure, and a sealing ring 14 is sleeved on the side wall of the boss. The sealing ring 14 is adapted to the lower shell 11. The outer side wall of the lower shell 11 is provided with an external thread. The internal thread of the mounting pipe 1 and the external thread of the lower shell 11 are threaded together. The top of the lower shell 11 is sleeved inside the upper shell 6, and the lower shell 11 and the upper shell 6 are interference fit. A sealing gasket 10 is installed between the lower shell 11 and the upper shell 6. The mounting pipe 1 and the upper shell 6 can be installed and fixed by the internal thread of the mounting pipe 1 and the external thread of the lower shell 11, which is convenient for customers to install the level sensor at a high position. The sealing gasket 10 achieves a waterproof and dustproof sealing effect.

[0032] In this embodiment, the novel level sensor also includes two semi-circular circuit fixing components 8. Each of the two circuit fixing components 8 has a bayonet on its sidewall that matches the shape of the circuit section 9. The two circuit fixing components 8 are respectively fixed to the inner sidewall of the upper shell 6. The two circuit fixing components 8 abut against the circuit section 9 through the two bayonet slots. The circuit section 9 includes a power supply circuit, a measurement circuit, an oscillation circuit, an F / V conversion circuit, a hysteresis comparator, an A / D converter, a D / A conversion circuit, an MCU processor, a voltage feedback loop, a switch output circuit, a protection circuit, a status indication unit, and a non-contact sensor. The input I / O of the MCU processor is connected to the non-contact sensor signal, and the measuring electrode 12 is electrically connected to the measurement circuit. The non-contact sensor senses the presence or absence of magnetic objects, thereby generating high and low levels, realizing automatic setting of sensor parameters and achieving intelligent learning function. That is, the non-contact sensor is equipped with a learning function, which can be used to adjust the specific working state. The learning function enables it to automatically learn and shield background interference, making the level sensor detection more convenient and the detection results more accurate, avoiding errors and inconvenience caused by manual adjustment.

[0033] In this embodiment, the LED indicator 15 is electrically connected to the status indicator unit. The LED indicator 15 is red and green dual-color. The output I / O of the MCU processor is connected to the red and green dual-color LED status indicator through a current-limiting resistor, so as to output indication through different colored lights. That is, the LED status indicator is used to indicate the working status of the material level sensor, so that the operator can more intuitively observe the material detection status.

[0034] In this embodiment, the cleaning mechanism includes an annular seat 3, which is sleeved on the outer wall of the sensing electrode 2. The annular seat 3 has a hollow structure, and multiple bends 24 are arranged in a circular pattern at equal intervals at the bottom of the annular seat 3. A flexible hose 4 is arranged through the outer wall of the annular seat 3, and one end of the flexible hose 4 passes through the inside of the installation pipe 1 and exits from the top of the installation pipe 1. A first solenoid valve 25 is installed on the outer wall of the flexible hose 4. A fan is pre-connected to one end of the flexible hose 4. At this time, the power switch of the first solenoid valve 25 is turned on and the power switch of the second solenoid valve 20 is turned off, and the fan is driven to blow outside air into the annular seat 3 through the flexible hose 4 and onto the surface of the sensing electrode 2 through the multiple bends 24. This can effectively prevent material from adhering to the surface of the sensing electrode 2, avoid accidental contact, and improve the accuracy of measurement.

[0035] In this embodiment, the moving mechanism includes two sleeves 13, each sleeve 13 being installed inside two circular grooves 16. Circular blocks 21 are slidably connected to the inner walls of each sleeve 13. Connecting rods 22 are fixed to the bottom of each of the two circular blocks 21, with one end of each connecting rod 22 penetrating the bottom of the two sleeves 13. One end of each connecting rod 22 is fixed to the top of the sensing electrode 2. Springs 23 are sleeved on the sidewalls of each connecting rod 22. An annular tube 17 is provided at the top of the annular seat 3. Two second branch tubes 18 are symmetrically installed on the sidewalls of the annular tube 17, and each second branch tube 18 communicates with one of the two sleeves 13. A first branch pipe 19 is installed on the outer wall, and the annular pipe 17 and the flexible hose 4 are connected. A second solenoid valve 20 is installed on the outer wall of the first branch pipe 19. When the power switch of the first solenoid valve 25 is closed and the power switch of the second solenoid valve 20 is turned on, air enters the interior of the annular pipe 17 through the first branch pipe 19 and enters the interior of the two sleeves 13 through the two second branch pipes 18 respectively. This causes the pressure inside the two sleeves 13 to gradually increase, thereby pushing the two circular blocks 21 to move downward along the inner wall of the two sleeves 13 respectively, which in turn drives the two connecting rods 22 to move downward, thereby realizing the height adjustment of the sensing electrode 2. The operation is simple and easy to use.

[0036] The working principle of circuit section 9 is as follows:

[0037] The power supply circuit provides power; the MCU processor is connected to the D / A conversion circuit, which is connected to the oscillation circuit to supply power to the oscillation circuit; the sine wave signal of the oscillation circuit is converted by the F / V conversion circuit and then sent to the hysteresis comparator, which converts it into a digital quantity and then sends it to the MCU processor; the output I / O of the MCU processor is connected to the switch output circuit. The input of the voltage feedback loop is connected to the F / V conversion circuit, and the output is connected to the MCU processor via an A / D converter. The voltage feedback loop is used to obtain the state of the oscillation circuit and can adjust the state of the oscillation circuit through the D / A conversion circuit. The input I / O of the MCU processor is connected to a non-contact sensor through a current-limiting resistor. The power supply circuit includes an 18-36V DC power supply and is equipped with anti-interference, anti-static, and lightning protection components such as ferrite beads and chokes to isolate and shield high-frequency and common-mode interference signals inside the power supply and prevent signal distortion. At the same time, the power supply and the upper shell 6 are electrically connected to ground to release excess charge and interference inside the circuit, giving it strong lightning protection and anti-interference performance. The oscillation circuit is a quartz crystal oscillation circuit with a frequency of 2MHz. The components of the oscillation circuit are selected with low temperature drift precision components to ensure the temperature of the oscillation circuit. For stability, the oscillation circuit is connected to the sensing electrode 2 via a series resistor. The measuring electrode 12 is made of columnar metal material and acts as a plate. When an object approaches, it changes the dielectric constant of the electrode, thereby changing the amplitude of the oscillation circuit. The D / A conversion circuit uses a digital-to-analog converter to convert digital signals into analog voltage signals. The MCU processor supplies power to the oscillation circuit and controls its state through the D / A conversion circuit. The protection circuit is connected to the switch output circuit and provides reverse polarity protection, short-circuit protection, and overload protection. The protection circuit includes a resettable fuse connected in series in the output circuit and connected to the drain of the MOSFET. When a short circuit occurs, the current flowing through the fuse increases, exceeding the fuse's rated value, causing the fuse to open and the output to shut off, thus achieving short-circuit protection.

[0038] When cleaning the sensing electrode 2, the mounting pipe 1 and the upper shell 6 can be installed and fixed through the internal thread of the mounting pipe 1 and the external thread of the lower shell 11, facilitating high-level installation of the level sensor by the customer. During use, a blower is pre-connected to one end of the hose 4. At this time, the power switch of the first solenoid valve 25 is turned on and the power switch of the second solenoid valve 20 is turned off, driving the blower to blow outside air through the hose 4 into the annular seat 3, and then through multiple bends 24 onto the surface of the sensing electrode 2. This effectively prevents material from adhering to the surface of the sensing electrode 2, avoiding accidental contact. To improve measurement accuracy, when fine-tuning of the height of the sensing electrode 2 is required, the power switch of the first solenoid valve 25 is turned off and the power switch of the second solenoid valve 20 is turned on. At this time, air enters the interior of the annular pipe 17 through the first branch pipe 19 and enters the interior of the two sleeves 13 through the two second branch pipes 18 respectively, causing the pressure inside the two sleeves 13 to gradually increase, thereby pushing the two circular blocks 21 to move downward along the inner wall of the two sleeves 13 respectively, thereby driving the two connecting rods 22 to move downward, realizing the height adjustment of the sensing electrode 2. The operation is simple and easy to use.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-modal fixed mounted novel level sensor characterized in that, The material level sensor is provided with a cable insert (5), a circuit part (9), a lower shell (11), and a sensing electrode (2) from top to bottom. The sensing electrode (2) has a hollow structure. The cable insert (5), the circuit part (9), and the detection mechanism are connected in sequence. The circuit part (9) is sealed with an upper shell (6). The top of the upper shell (6) has a mounting hole. The cable insert (5) passes through the mounting hole and is press-fitted with the upper shell (6). The outer wall of the upper shell (6) is provided with a mounting pipe (1). The inner wall of the installation pipe (1) is provided with an internal thread near the bottom. The bottom of the cable plug (5) is provided with an LED indicator (15). The side wall of the upper shell (6) is provided with multiple round holes (7). The LED indicator (15) is electrically connected to the circuit part (9). The outer wall of the sensing electrode (2) is provided with a cleaning mechanism for cleaning the sensing electrode (2). The bottom of the lower shell (11) is symmetrically provided with two round grooves (16). The two round grooves (16) are provided with a moving mechanism for moving the sensing electrode (2).

2. The novel level sensor of claim 1, wherein, The top of the upper shell (6) is a cylindrical boss structure, the mounting hole is a through hole of the boss structure, and multiple evenly distributed round holes (7) are opened on the side wall of the boss structure for the circular groove (16) to transmit light evenly in four directions.

3. The novel level sensor of claim 1, wherein, The lower shell (11) is provided with a probe, a measuring electrode (12) and a sensing electrode (2) installed in sequence. The top of the measuring electrode (12) is a boss structure. A sealing ring (14) is sleeved on the side wall of the boss and the sealing ring (14) is adapted to the lower shell (11). The outer side wall of the lower shell (11) is provided with an external thread. The internal thread of the installation pipe (1) and the external thread of the lower shell (11) are threaded together.

4. The novel level sensor of claim 3, wherein, The measuring electrode (12) is fitted inside the cavity of the sensing electrode (2), and the measuring electrode (12) and the sensing electrode (2) are interference-fitted. The top of the lower shell (11) is fitted inside the upper shell (6), and the lower shell (11) and the upper shell (6) are interference-fitted. A sealing gasket (10) is installed between the lower shell (11) and the upper shell (6).

5. The novel level sensor of claim 1, wherein, The novel material level sensor also includes two semi-circular circuit fixing parts (8). The side walls of the two circuit fixing parts (8) are provided with slots that match the shape of the circuit part (9). The two circuit fixing parts (8) are respectively fixed on the inner side wall of the upper shell (6). The two circuit fixing parts (8) abut against the circuit part (9) through the two slots respectively.

6. The novel level sensor according to claim 3 or 4, characterized in that The circuit section (9) is provided with a power supply circuit, a measurement circuit, an oscillation circuit, an F / V conversion circuit, a hysteresis comparator, an A / D converter, a D / A conversion circuit, an MCU processor, a voltage feedback loop, a switch output circuit, a protection circuit, a status indication unit, and a non-contact sensor. The input I / O of the MCU processor is connected to the signal of the non-contact sensor, and the measurement electrode (12) is electrically connected to the measurement circuit.

7. The novel level sensor of claim 6, wherein, The LED indicator (15) is electrically connected to the status indicator unit, and the LED indicator (15) is red and green.

8. A multi-modal fixed mounted novel level sensor as claimed in claim 1, wherein, The cleaning mechanism includes an annular seat (3), which is sleeved on the outer wall of the sensing electrode (2). The annular seat (3) has a hollow structure. Multiple bends (24) are arranged in a circular pattern at equal intervals at the bottom of the annular seat (3). A flexible hose (4) is arranged through the outer wall of the annular seat (3). One end of the flexible hose (4) passes through the inside of the installation pipe (1) and exits from the top of the installation pipe (1). A first solenoid valve (25) is installed on the outer wall of the flexible hose (4).

9. A multi-modal fixed mounted novel level sensor according to claim 8, wherein, The moving mechanism includes two sleeves (13), each sleeve (13) is installed inside two circular grooves (16), and a circular block (21) is slidably connected to the inner sidewall of each sleeve (13). A connecting rod (22) is fixed to the bottom of each of the two circular blocks (21), and one end of each connecting rod (22) passes through the bottom of the two sleeves (13). One end of each connecting rod (22) is fixed to the top of the sensing electrode (2). A spring (23) is sleeved on the sidewall of each connecting rod (22). An annular tube (17) is provided on the top of the annular seat (3). Two second branch tubes (18) are symmetrically installed on the sidewall of the annular tube (17), and the two second branch tubes (18) are respectively connected to the two sleeves (13). A first branch tube (19) is installed on the outer sidewall of the annular tube (17), and the annular tube (17) is connected to the hose (4). A second solenoid valve (20) is installed on the outer sidewall of the first branch tube (19).

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