sensor

Abstract

This invention belongs to the field of sensor sealing technology and discloses a sensor. The sensor includes a housing, a PCBA, a mounting assembly, and a UV lamp. The housing has a mounting cavity; the mounting assembly is disposed within the mounting cavity and divides the mounting cavity into a potting area and a detection area; the PCBA is disposed within the potting area, and the mounting assembly and PCBA enclose a sealed cavity, which communicates with the detection area but is isolated from the potting area; the UV lamp is inserted into the sealed cavity and electrically connected to the PCBA, and the UV lamp is used to irradiate light into the detection area. Thus, when the sensor is in use, the mounting assembly ensures that the potting area and the detection area remain separated, and the sealed cavity also blocks the light generated by the UV lamp, preventing light from irradiating the potting area and preventing the adhesive in the potting area from generating volatiles due to light irradiation. Therefore, this sensor effectively reduces the possibility of the UV lamp surface being covered by volatiles, thereby ensuring that the sensor can perform detection normally and reducing the possibility of sensor accuracy degradation.

Description

Technical Field

[0001] This invention relates to the field of sensor sealing technology, and more particularly to sensors. Background Technology

[0002] As a commonly used detection device, sensors can detect temperature, pressure, liquid level, speed, and gas concentration. Among them, the PID (Photo Ionization Detector) uses an ultraviolet light source to excite and ionize the gas to be measured, generating positive and negative ions. The current generated by these ionized particles is amplified by the detector, and the concentration at the ppm level can be displayed on the instrument. Moreover, after passing through the electrodes, the ions quickly recombine into the original organic molecules, so the molecules are not damaged during the concentration detection process.

[0003] In the prior art, the PID sensor includes a housing, a PCBA (Printed Circuit Board Assembly), and a UV lamp. The PCBA is sealed inside the housing by potting compound. The UV lamp is placed inside the housing and electrically connected to the PCBA. A light hole corresponding to the UV lamp is provided on the housing so that light can be emitted to irradiate the gas to be detected.

[0004] However, during the aforementioned testing process, some of the light generated by the UV lamps shines into the inside of the casing. When the adhesive inside the casing is exposed to the UV lamp light, the active factors inside are easily excited and produce volatiles. These volatiles adhere to the surface of the UV lamp, causing a decrease in the sensitivity of the sensor, which in turn reduces the detection accuracy of the sensor. Summary of the Invention

[0005] The purpose of this invention is to provide a sensor that solves the problem in the prior art where, during use, the light generated by the UV lamp shines on the adhesive, causing the adhesive to produce volatile substances that easily adhere to the surface of the UV lamp, resulting in reduced sensor sensitivity and consequently reduced sensor detection accuracy.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This invention provides a sensor, comprising:

[0008] The outer casing has a mounting cavity;

[0009] The mounting components are disposed within the mounting cavity and divide the mounting cavity into a potting area and a testing area;

[0010] A PCBA, disposed within the potting area, wherein the mounting assembly and the PCBA enclose a sealed cavity, the sealed cavity communicating with the detection area and isolated from the potting area; and

[0011] A UV lamp is inserted into the sealed cavity and electrically connected to the PCBA. The UV lamp is used to irradiate light into the detection area.

[0012] Optionally, the mounting components include:

[0013] A mounting platform, disposed within the housing and abutting against the cavity wall of the mounting cavity to divide the mounting cavity into the glue-filling area and the testing area; and

[0014] A sealing cylinder is disposed on the mounting platform and extends into the potting area. The sealing cylinder has a connection port. The PCBA is fitted with the sealing cylinder to close the connection port and form the sealing cavity. The PCBA partially extends through the connection port into the sealing cavity to be electrically connected to the UV lamp.

[0015] Optionally, the mounting components further include:

[0016] A sealing ring is disposed on the mounting platform and abuts against the cavity wall of the mounting cavity.

[0017] Optionally, the housing includes:

[0018] The housing, the mounting assembly and the PCBA are disposed within the housing, and the potting area is formed by the lower side of the mounting platform, the outer side of the sealing cylinder and the inner side of the housing.

[0019] An end cap is disposed at one end of the housing and has a vent hole for gas flow. The detection area is formed by the lower side of the end cap, the inner side of the housing, and the upper side of the mounting platform.

[0020] Optionally, the PCBA includes:

[0021] The main body, inserted into the outer shell and fitted with the mounting assembly to enclose and form the sealed cavity; and

[0022] Two opposing elastic clips are provided, one end of which is connected to the main body, and the other end extends into the sealed cavity to clamp the UV lamp and is electrically connected to the UV lamp.

[0023] Optionally, the PCBA further includes:

[0024] A cap is disposed on the main body and used to close the opening of the outer shell. The edge of the cap has a plurality of welding holes spaced apart, and the surface of the cap has a potting hole that communicates with the potting area.

[0025] Optionally, a limiting ring platform is provided on the inner side of the housing, and the side of the mounting component away from the PCBA abuts against the limiting ring platform.

[0026] Optionally, the sensor further includes:

[0027] An electrode plate is disposed within the detection area and electrically connected to the PCBA. The electrode plate has a light-transmitting hole corresponding to the UV lamp.

[0028] Optionally, the sensor further includes:

[0029] A positioning plate is disposed within the detection area, and the positioning plate is connected to the electrode plate and plugged into the mounting assembly.

[0030] Optionally, the sensor further includes:

[0031] A breathable protective layer is disposed on the side of the positioning plate away from the electrode plate and allows gas to pass through.

[0032] The beneficial effects of this invention are:

[0033] By installing a UV lamp within a sealed cavity and electrically connecting it to a PCBA, the PCBA can control the UV lamp's on / off state. When the UV lamp is on, its light illuminates the detection area, ionizing the gas within and converting it into an electric current for gas detection. The mounting components ensure separation between the potting area and the detection area, and the sealed cavity blocks the UV lamp's light, preventing it from reaching the potting area and thus preventing the potting compound from evaporating due to light exposure. This effectively reduces the likelihood of the UV lamp surface being covered by volatiles, ensuring proper sensor operation and minimizing the possibility of reduced sensor accuracy. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the sensor structure in an embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional view of the sensor in an embodiment of the present invention;

[0036] Figure 3 This is an exploded structural diagram of the UV lamp, PCBA, and mounting components of the sensor in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the exploded structure of the sensor in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the cover structure of the PCBA of the sensor in an embodiment of the present invention.

[0039] In the picture:

[0040] 1. Outer shell; 11. Potting area; 12. Testing area; 13. Shell; 14. End cap; 15. Limiting ring platform; 2. PCBA; 22. Main body; 23. Elastic clip; 24. Cover; 241. Welding hole; 242. Potting hole; 3. Mounting assembly; 31. Sealing cavity; 32. Mounting platform; 321. Mounting groove; 33. Sealing cylinder; 331. Connection port; 34. Sealing ring; 4. Electrode plate; 41. Light-transmitting hole; 5. UV lamp; 6. Socket; 7. Breathable protective layer; 8. Positioning plate. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0045] This invention provides a sensor.

[0046] Reference Figures 1 to 3 The sensor includes a housing 1, a PCBA 2, a mounting assembly 3, and a UV lamp 5. The housing 1 has a mounting cavity; the mounting assembly 3 is disposed in the mounting cavity and divides the mounting cavity into a potting area 11 and a detection area 12; the PCBA 2 is disposed in the potting area 11, and the mounting assembly 3 and the PCBA 2 enclose a sealed cavity 31, which is connected to the detection area 12 and isolated from the potting area 11; the UV lamp 5 is inserted into the sealed cavity 31 and electrically connected to the PCBA 2, and the UV lamp 5 is used to irradiate light into the detection area 12.

[0047] Specifically, the outer casing 1 can be cylindrical, with openings at both the top and bottom. The PCBA2 is inserted from the bottom and can close the opening at the bottom. An end cap 14 can be threaded onto the top of the outer casing 1 to close the top of the outer casing 1. The mounting assembly 3 is disposed inside the outer casing 1, and a detection area 12 is formed on the upper side of the mounting assembly 3. The end cap 14 allows gas to enter the detection area 12, where the gas is ionized by the light generated by the UV lamp 5. A potting area 11 is formed on the lower side of the mounting assembly 3, which forms an interlocking relationship with the PCBA2. For example, the mounting assembly 3 can be in the shape of a "7" to reserve space for the PCBA2 to be inserted. This makes the structural layout of the PCBA2 and the mounting assembly 3 compact, effectively and rationally utilizing the space inside the outer casing 1.

[0048] A cavity is formed within the mounting assembly 3. The cavity has an opening on the side facing PCBA2 so that a portion of the PCBA2 structure can extend into the cavity to form an electrical connection with the UV lamp 5. PCBA2 can close the opening so that the cavity becomes a sealed cavity 31. The upper end of the sealed cavity 31 is open for the insertion of the UV lamp 5.

[0049] By installing the UV lamp 5 inside the sealed cavity 31 and electrically connecting it to the PCBA2, the on / off state of the UV lamp 5 can be controlled via the PCBA2. When the UV lamp 5 is on, its light illuminates the detection area 12, causing the gas entering the detection area 12 to ionize. The gas can be detected based on the current generated after ionization. The specific detection principle is existing technology and will not be elaborated here. The mounting assembly 3 ensures that the potting area 11 and the detection area 12 remain separated, and the sealed cavity 31 also blocks the light generated by the UV lamp 5, preventing the light from illuminating the potting area 11 and preventing the adhesive in the potting area 11 from generating volatiles due to light exposure. Therefore, this sensor can effectively reduce the possibility of the UV lamp 5 surface being covered by volatiles, reducing the possibility of decreased sensor accuracy.

[0050] Optionally, the mounting assembly 3 includes a mounting platform 32 and a sealing cylinder 33. The mounting platform 32 is disposed inside the housing 1 and abuts against the cavity wall of the mounting cavity to divide the mounting cavity into a potting area 11 and a testing area 12; the sealing cylinder 33 is disposed on the mounting platform 32 and extends into the potting area 11. The sealing cylinder 33 has a connection port 331. The PCBA2 is fitted with the sealing cylinder 33 to close the connection port 331 and enclose it to form a sealing cavity 31. The PCBA2 partially passes through the connection port 331 and extends into the sealing cavity 31 to be electrically connected to the UV lamp 5.

[0051] Specifically, the mounting platform 32 can be disc-shaped to fit the outer casing 1. The peripheral wall of the mounting platform 32 is fitted to the inner wall of the outer casing 1 to form a detection area 12 on the upper side of the mounting platform 32, and a potting area 11 on the lower side of the mounting platform 32. A sealing cylinder 33 is provided on the lower side of the mounting platform 32. The sealing cylinder 33 is elongated and extends along the thickness direction of the mounting platform 32 into the potting area 11. The sealing cylinder 33 and the mounting platform 32 can be integrally formed. The sealing cylinder 33 can be configured as two stepped sections. The section closer to the mounting platform 32 is cubic, with the aforementioned connection port 331 opened on the side of this section, and the side is sealed and fitted to the side of the PCBA2. The section farther from the mounting platform 32 is cylindrical, and the diameter of this section is adapted to the UV lamp 5 so that the UV lamp 5 can be inserted into this section. At the same time, the end face of the sealing cylinder 33 away from the mounting platform 32 abuts against the PCBA2.

[0052] By setting up the mounting platform 32 and the sealing cylinder 33, during the installation of the UV lamp 5, the UV lamp 5 is inserted into the sealing cylinder 33 and connected to the part of the PCBA2 that extends into the sealing cavity 31. This allows the PCBA2 and the UV lamp 5 to form an electrical connection while simultaneously sealing the connection port 331, thus confining the light generated by the UV lamp 5 within the sealing cavity 31. To effectively block the light, both the sealing cylinder 33 and the mounting platform 32 can be made of materials with good light reflectivity, such as EPDF (Ethylene-Propylene-Diene Monomer).

[0053] Optionally, the mounting assembly 3 also includes a sealing ring 34. The sealing ring 34 is disposed on the mounting platform 32 and abuts against the cavity wall of the mounting cavity. Specifically, a mounting groove 321 is provided around the peripheral wall of the mounting platform 32. A portion of the sealing ring 34 is embedded in the mounting groove 321 and can be fixed by adhesive, while the other portion protrudes from the mounting groove 321 and abuts against the inner wall of the outer casing 1, thereby forming a seal between the mounting platform 32 and the outer casing 1. It should be understood that the mounting groove 321 can also be formed on the inner wall of the outer casing 1. In this case, the sealing ring 34 abutting against the outer peripheral wall of the mounting platform 32 can also form a seal. The specific installation method of the sealing ring 34 can be designed according to the actual installation situation, and the present invention does not limit it.

[0054] By designing the sealing ring 34, after the mounting platform 32 is installed into the housing 1, the sealing ring 34 and the housing 1 are pressed together to form a sealed connection between the mounting platform 32 and the housing 1, thereby improving the sealing performance between the detection area 12 and the potting area 11.

[0055] Optionally, a limiting ring platform 15 is provided on the inner side of the outer casing 1, and the side of the mounting component 3 away from the PCBA2 abuts against the limiting ring platform 15. Specifically, the limiting ring platform 15 is provided inside the outer casing 1 and near the upper opening. The limiting ring platform 15 is an integral structure with the outer casing 1. The bottom surface of the limiting ring platform 15 abuts against the top surface of the mounting platform 32 of the mounting component 3, and the two form a surface contact, so that the mounting platform 32 can remain flat after being inserted into the outer casing 1.

[0056] Optionally, the housing 1 includes a housing 13 and an end cap 14. The mounting assembly 3 and PCBA2 are disposed inside the housing 13, and the lower side of the mounting platform 32, the outer side of the sealing cylinder 33, and the inner side of the housing 13 enclose a potting area 11; the end cap 14 is disposed at one end of the housing 13 and has a vent hole for gas flow, and the lower side of the end cap 14, the inner side of the housing 13, and the upper side of the mounting platform 32 enclose a detection area 12.

[0057] Specifically, a connecting ring is provided on the upper side of the housing 13, and the two can be integrated into one piece. The outer diameter of the connecting ring is smaller than the outer diameter of the housing 13. The outer wall of the connecting ring is provided with external threads, and the inner side of the end cap 14 is provided with internal threads that mate with the external threads. The outer side of the end cap 14 is flush with the outer side of the housing 13 to improve the overall appearance of the housing 1. The connecting ring protrudes outward on the side closest to the housing 13 to limit the end cap 14. Multiple through holes are arrayed on the surface of the end cap 14 as vent holes, which communicate with the detection area 12 to allow gas to enter the detection area 12.

[0058] Reference Figures 3 to 5 Optionally, PCBA2 includes a main body 22 and two opposing elastic clips 23. The main body 22 is inserted into the housing 1 and fits against the mounting assembly 3 to form a sealed cavity 31; one end of the elastic clip 23 is connected to the main body 22, and the other end extends into the sealed cavity 31 to hold the UV lamp 5 and is electrically connected to the UV lamp 5.

[0059] Specifically, the main body 22 is semi-cylindrical, with its top wall abutting against the lower side of the mounting platform 32. Its arc surface is adapted to the outer shell 1, and its vertical surface fits against the side of the first section of the sealing cylinder 33 to seal the connection port 331. Two elastic clips 23 are disposed on this vertical surface. The two elastic clips 23 serve as two electrodes, respectively clamping the two sides of the UV lamp 5. The elastic clips 23 are semi-circular to adapt to the shape of the UV lamp 5, so that the connecting ring can not only hold the UV lamp 5 but also form effective contact with the UV lamp 5, which is beneficial to improving the response speed of exciting and illuminating the UV lamp 5.

[0060] By setting up the main body 22 and the elastic clips 23, before the UV lamp 5 is inserted into the sealing cylinder 33, the main body 22 of the PCBA2 is aligned with the side of the sealing cylinder 33, and the elastic clips 23 are inserted into the sealing cylinder 33 through the connecting port 331. When the UV lamp 5 is inserted into the sealing cylinder 33, the UV lamp 5 will be inserted into the two elastic clips 23. In this way, the PCBA2 can be activated and lit by the connecting ring to activate the UV lamp 5.

[0061] Optionally, PCBA2 also includes a cover 24. The cover 24 is disposed on the main body 22 and used to close the opening of the outer shell 1. Multiple solder holes 241 are spaced apart along the edge of the cover 24, and a potting hole 242 communicating with the potting area 11 is provided on the surface of the cover 24. Specifically, the cover 24 is fixed to the side of the main body 22 away from the mounting platform 32, and the cover 24 is disc-shaped to fit the shape of the outer shell 1. Semi-circular solder holes 241 can be provided at the edge of the cover 24, and the diameter of the cover 24 matches the inner diameter of the outer shell 1, allowing the cover 24 to be completely located within the outer shell 1, and the solder holes 241 are covered by the outer shell 1 to provide a location for spot welding. In this embodiment, three solder holes 241 can be evenly spaced in a ring. In other embodiments, the number of solder holes 241 can be designed according to the size of the cover 24.

[0062] The end face of the sealing cylinder 33 abuts against the inner side of the cover 24 to maintain a seal. The potting holes 242 are spaced apart from the sealing cylinder 33. By setting the cover 24, when the PCBA2 is inserted into the housing 1, the cover 24 can close the opening on the lower side of the housing 1. The cover 24 is fixed to the housing 1 by spot welding at the welding hole 241. Then, the potting hole 242 is used to pot the potting area 11. The potting holes 242 are spaced apart from the sealing cylinder 33 to ensure that the glue does not flow into the sealing cavity 31, so that the UV lamp 5 can be successfully isolated from the glue.

[0063] Continue to refer to Figure 2 and Figure 4 The sensor also includes an electrode plate 4. The electrode plate 4 is disposed in the detection area 12 and electrically connected to the PCBA2. The electrode plate 4 has a light-transmitting hole 41 corresponding to the UV lamp 5.

[0064] Specifically, the electrode plate 4 may include a positive electrode plate and a negative electrode plate to form a complete circuit. Multiple sockets 6 are provided on the mounting platform 32. The sockets 6 can be interference-fitted with the mounting platform 32 to form a seal. One end of the socket 6 passing through the mounting platform 32 is fixed to the PCBA2 by welding, while the other end of the socket 6 is inserted into the pins on the electrode plate 4 to conduct electricity between the electrode plate 4 and the PCBA2.

[0065] The sensor also includes a positioning plate 8 and a breathable protective layer 7. The positioning plate 8 is disposed within the detection area 12, and is connected to the electrode plate 4 and plugged into the mounting assembly 3. The breathable protective layer 7 is disposed on the side of the positioning plate 8 away from the electrode plate 4 and allows gas to pass through.

[0066] Specifically, an end cap 14 is threadedly connected to the upper side of the outer casing 1. A breathable protective layer 7 is provided on the lower side of the end cap 14. The breathable protective layer 7 can be a waterproof and breathable membrane to achieve the effect of waterproofing and breathability, or it can be a breathable protective layer 7 with other functions. The specific function of the breathable protective layer 7 can be designed according to the requirements. A positioning plate 8 is provided on the lower side of the breathable protective layer 7. The positioning plate 8 is disc-shaped and is fixedly connected to the electrode plate 4. The lower side of the positioning plate 8 has a protrusion that can form an insertion fit with the mounting platform 32. This allows it to cooperate with the mounting platform 32 to clamp the electrode plate 4 and ensure the installation stability of the electrode plate 4.

[0067] When the sensor is in use, the gas to be detected enters the detection area 12 through the vent on the end cap 14. The gas passes through the waterproof and breathable membrane and the positioning plate 8 in sequence. The light generated by the UV lamp 5 shines into the detection area 12 through the light-transmitting hole 41 of the electrode plate 4. When the light shines on the gas, positive and negative ions are generated in the gas. The positive and negative ions interact with the electrode plate 4 to generate a current, so that the concentration of the gas can be easily detected by the magnitude of the current.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sensor characterized by, include: The outer casing (1) has a mounting cavity; The mounting component (3) is disposed in the mounting cavity and divides the mounting cavity into a potting area (11) and a testing area (12); PCBA (2) is disposed in the potting area (11). The mounting component (3) and PCBA (2) enclose a sealed cavity (31). The sealed cavity (31) is connected to the detection area (12) and isolated from the potting area (11). as well as A UV lamp (5) is inserted into the sealed cavity (31) and electrically connected to the PCBA (2). The UV lamp (5) is used to irradiate light into the detection area (12). The installation component (3) includes: A mounting platform (32) is disposed within the housing (1) and abuts against the cavity wall of the mounting cavity to divide the mounting cavity into the potting area (11) and the testing area (12); and A sealing cylinder (33) is disposed on the mounting platform (32) and extends into the potting area (11). The sealing cylinder (33) has a connection port (331). The PCBA (2) is fitted with the sealing cylinder (33) to close the connection port (331) and form the sealing cavity (31). The PCBA (2) partially passes through the connection port (331) and extends into the sealing cavity (31) to be electrically connected to the UV lamp (5). The PCBA (2) includes: The main body (22) is inserted into the outer shell (1) and abuts against the mounting assembly (3) to enclose and form the sealed cavity (31); and Two opposing elastic clips (23) are provided, one end of which is connected to the main body (22), and the other end extends into the sealed cavity (31) to clamp the UV lamp (5) and is electrically connected to the UV lamp (5).

2. The sensor of claim 1, wherein, The installation component (3) also includes: A sealing ring (34) is disposed on the mounting platform (32) and abuts against the cavity wall of the mounting cavity.

3. The sensor of claim 1, wherein, The outer casing (1) includes: The housing (13), the mounting assembly (3) and the PCBA (2) are disposed inside the housing (13), and the potting area (11) is formed by the lower side of the mounting platform (32), the outer side of the sealing cylinder (33) and the inner side of the housing (13). An end cap (14) is disposed at one end of the housing (13) and has a vent hole for gas flow. The detection area (12) is formed by the lower side of the end cap (14), the inner side of the housing (13) and the upper side of the mounting platform (32).

4. The sensor according to claim 1, characterized in that, The PCBA (2) also includes: A cover (24) is disposed on the main body (22) and used to close the opening of the outer shell (1). The edge of the cover (24) is provided with a plurality of welding holes (241) spaced apart. The surface of the cover (24) is provided with a potting hole (242) communicating with the potting area (11).

5. The sensor of any one of claims 1 to 3, wherein, The inner side of the housing (1) is provided with a limiting ring platform (15), and the side of the mounting component (3) away from the PCBA (2) abuts against the limiting ring platform (15).

6. The sensor of any one of claims 1 to 3, wherein, The sensor also includes: An electrode plate (4) is disposed in the detection area (12) and electrically connected to the PCBA (2). The electrode plate (4) has a light-transmitting hole (41) corresponding to the UV lamp (5).

7. The sensor of claim 6, wherein, The sensor also includes: A positioning plate (8) is disposed in the detection area (12). The positioning plate (8) is connected to the electrode plate (4) and is plugged into the mounting assembly (3).

8. The sensor of claim 7, wherein, The sensor also includes: A breathable protective layer (7) is provided on the side of the positioning plate (8) away from the electrode plate (4) and allows gas to pass through.

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