Novel PID sensor

Abstract

The utility model discloses a novel PID sensor. The novel PID sensor comprises a sensor housing; the sensor PCB is arranged in the sensor shell; the vacuum ultraviolet lamp is arranged in the sensor shell and is connected with the sensor PCB, and a lamp window part of the vacuum ultraviolet lamp penetrates through a lamp hole of the sensor PCB; the detector is installed in the sensor shell and located above the sensor PCB, the detector comprises a detector shell and an electrode plate assembly arranged in the detector shell, and an ionization chamber is formed in the electrode plate assembly and located above the lamp window part of the vacuum ultraviolet lamp; and an electric heating sheet assembly which is connected with the sensor PCB and is used for heating gas entering the ionization chamber and the surrounding environment of the ionization chamber is arranged above the electrode sheet assembly in the detector shell. The water vapor is prevented from condensing in the ionization chamber to influence the normal operation of the sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection sensors, in particular to a novel PID sensor. Background Art

[0002] PID sensor (PID, Photo Lonization Detector) is a sensor for gas detection based on the principle of high-energy ultraviolet light ionization of gas. It uses high-energy ultraviolet light generated by a vacuum ultraviolet lamp to irradiate the target gas through the lamp window. The target gas will be ionized by the high-energy ultraviolet light to form positively charged ions and negatively charged electrons. Under the action of the electric field of the polarized electrode sheets (i.e., the bias electrode sheet and the signal electrode sheet), the ions and electrons flow to the two electrode sheets respectively, thereby forming a weak current that can be detected. The magnitude of this current corresponds to the concentration of the target gas. The process of ionization and collection of these electrons and ions occurs in the ionization chamber of the PID sensor.

[0003] Due to the upgrade and iteration of PDI sensors, the ionization chamber space of the sensor is getting smaller and smaller, and the components are arranged very compactly, so it is particularly sensitive to the humidity in the ionization chamber. In an environment with high relative humidity, water vapor will enter the ionization chamber and adhere to the inside of the ionization chamber and the electrode sheet, causing leakage current to increase and baseline drift, affecting detection accuracy, and even failing to work properly. In addition, high humidity has an adverse effect on the lamp window of some models of vacuum ultraviolet lamps. Therefore, many PID sensor manufacturers are trying to solve the problems caused by high humidity.

[0004] For example, Chinese utility model patent CN217931518U discloses a PID electrode structure and a PID detector including the electrode structure, which adopts the technical solution of heating two electrode sheets in the ionization chamber with MCH ceramic electrothermal material, and can solve the problem that the corresponding type of sensor works normally in a high humidity environment. However, the configuration of this solution occupies a large space, has a high cost, and its configuration is monotonous, and cannot be applied to the current mainstream 4R size PID sensor.

[0005] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0006] The technical problem to be solved by the utility model is: to provide a new PID sensor which can work normally in a high humidity environment, has a compact structure and a low manufacturing cost in view of the deficiencies of the prior art.

[0007] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0008] A new type of PID sensor, comprising:

[0009] Sensor housing;

[0010] A sensor PCB board installed in the sensor housing, wherein a lamp hole is opened in the sensor PCB board;

[0011] A vacuum ultraviolet lamp installed in the sensor housing and connected to the sensor PCB, wherein a lamp window of the vacuum ultraviolet lamp passes through a lamp hole of the sensor PCB;

[0012] A detector installed in the sensor housing and located above the sensor PCB board, the detector comprising a detector housing and an electrode sheet assembly arranged in the detector housing, the detector housing being provided with an accommodating through hole for accommodating a lamp window portion of the vacuum ultraviolet lamp at a position above the vacuum ultraviolet lamp, and an ionization chamber being formed in the electrode sheet assembly above the lamp window portion of the vacuum ultraviolet lamp; characterized in that:

[0013] An electric heating plate assembly connected to the sensor PCB board is arranged above the electrode plate assembly in the detector housing and is used to heat the gas entering the ionization chamber and its surrounding environment.

[0014] In a preferred embodiment of the present invention, a temperature and humidity sensor connected to the sensor PCB board is provided on the sensor PCB board at a position close to the ionization chamber.

[0015] In a preferred embodiment of the present invention, the distance between the lower end surface of the electric heating sheet assembly and the upper end surface of the electrode sheet assembly is 0.2 mm to 3.4 mm.

[0016] In a preferred embodiment of the present utility model, the electric heating plate assembly comprises:

[0017] A grid strip heating plate, wherein a ventilation gap is formed in the grid strip heating plate;

[0018] A grid fixing plate is arranged on the upper end surface of the grid strip heating plate, and a first ventilation window is opened at a position of the grid fixing plate above the ionization chamber and the temperature and humidity sensor;

[0019] A first insulating spacer is provided on the lower end surface of the grid strip heating plate, wherein the first insulating spacer is provided with a second ventilation window at a position above the ionization chamber and the temperature and humidity sensor; and

[0020] The first and second heating pins are inserted on both sides of the grid strip heating plate. The first and second heating pins pass through the first insulating spacer and the detector housing and are correspondingly inserted into the heating holes formed on the sensor PCB board.

[0021] In a preferred embodiment of the utility model, the grid strip heating plate is cut from a metal sheet into grid strips of fixed width, two adjacent grid strips are connected head to tail to form a series electrical connection between the grid strips, and the gap between two adjacent grid strips forms the air permeable gap.

[0022] In a preferred embodiment of the present invention, avoidance through holes for avoiding electrode pins of the electrode sheet assembly are respectively provided on the grid strip heating sheet and the first insulating spacer.

[0023] In a preferred embodiment of the utility model, the first air permeable window of the grid fixing plate in the electric heating plate assembly is divided into two independent windows by a partition, and the second air permeable window of the first insulating partition in the electric heating plate assembly is divided into two independent windows by a partition.

[0024] In a preferred embodiment of the present utility model, the electric heating plate assembly comprises:

[0025] A sheet-type winding frame, wherein the sheet-type winding frame is provided with a third ventilation window at a position above the ionization chamber and the temperature and humidity sensor, and the sheet-type winding frame is provided with a first power connection hole and a second power connection hole on both sides of the third ventilation window;

[0026] An electric heating wire wound at intervals on the sheet-type winding frame and covering the third ventilation window, one end of the electric heating wire being connected to the first power connection hole, and the other end thereof being connected to the second power connection hole;

[0027] a second insulating spacer disposed on the lower end surface of the sheet-type winding frame, wherein the second insulating spacer is provided with a fourth ventilation window at a position above the ionization chamber and the temperature and humidity sensor; and

[0028] The third heating pin and the fourth heating pin are inserted into the first power connection hole and the second power connection hole of the sheet-type winding frame. After passing through the second insulating spacer and the detector shell, the third heating pin and the fourth heating pin are correspondingly inserted into the heating holes formed on the sensor PCB board.

[0029] In a preferred embodiment of the utility model, a plurality of spaced-apart tooth-shaped fixing grooves are formed on the outer periphery of the sheet-type winding frame at positions on both sides of the third ventilation window, and the heating wire is wound on the plurality of tooth-shaped fixing grooves of the sheet-type winding frame.

[0030] In a preferred embodiment of the present invention, a through hole for avoiding the electrode pins of the electrode sheet assembly is provided on the second insulating spacer.

[0031] In a preferred embodiment of the present invention, the electrode sheet assembly comprises:

[0032] An electrode sheet, wherein the electrode sheet is formed by stacking upper and lower PCB electrode plates, and the electrode sheet is located above the lamp window of the vacuum ultraviolet lamp and is provided with a plurality of ionization through holes passing through the upper and lower PCB electrode plates, and the plurality of ionization through holes constitute the ionization chamber; and

[0033] The first, second and third electrode pins are inserted on the electrode sheet at intervals and connected to the sensor PCB board.

[0034] In a preferred embodiment of the present utility model, the first electrode pin is connected to the upper PCB electrode plate and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board, the second electrode pin is connected to the lower PCB electrode plate and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board, and the third electrode pin is connected to the upper and lower PCB electrode plates and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board.

[0035] In a preferred embodiment of the present invention, the upper and lower PCB electrode plates are Teflon PCB plates, and the first, second and third electrode pins are copper pins.

[0036] In a preferred embodiment of the utility model, the detector housing is provided with a first make way window at a position above the temperature and humidity sensor, and the electrode sheet is provided with a second make way window connected to the first make way window at a position above the temperature and humidity sensor; when installed, the temperature and humidity sensor is located in the first make way window and the second make way window.

[0037] In a preferred embodiment of the present utility model, a waterproof and breathable membrane is provided on the detector housing above the electric heating plate assembly.

[0038] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0039] 1. The utility model arranges an electric heating plate assembly above the electrode plate assembly in the detector housing, and uses the electric heating plate assembly to heat the gas entering the ionization chamber and its surrounding environment, so that the relative humidity in the ionization chamber and its surrounding environment is reduced, and condensation of water vapor in the ionization chamber is avoided, thereby ensuring the normal operation of the sensor;

[0040] 2. The utility model is provided with a temperature and humidity sensor, which monitors the temperature and humidity of the surrounding environment of the ionization chamber in real time, controls the operation of the electric heating plate assembly according to the monitored temperature and humidity conditions, and controls the humidity in the ionization chamber and its surrounding environment more timely and efficiently to ensure the normal operation of the sensor; at the same time, the gas concentration measured by the sensor can be corrected in real time according to the monitored temperature and humidity values ​​to obtain more accurate results.

[0041] 3. The utility model prevents external water from entering the sensor by arranging a waterproof and breathable membrane on the detector housing, thereby ensuring the normal operation of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the exploded structure of the utility model.

[0044] Figure 2 It is a longitudinal sectional view of the utility model.

[0045] Figure 3 It is a schematic diagram of the exploded structure of the detector of the utility model.

[0046] Figure 4 It is a schematic diagram of the exploded structure of an embodiment of the electric heating plate assembly of the utility model.

[0047] Figure 5 It is a structural schematic diagram of an embodiment of the grid strip heating plate of the utility model.

[0048] Figure 6 It is a schematic diagram of the exploded structure of another embodiment of the electric heating plate assembly of the utility model.

[0049] Figure 7 It is a structural schematic diagram of another embodiment of the grid strip heating plate of the utility model.

[0050] Figure 8 It is a schematic diagram of the exploded structure of another embodiment of the electric heating plate assembly of the utility model.

[0051] Fig. 9 It is a structural schematic diagram of a sheet-type winding frame of the utility model. DETAILED DESCRIPTION

[0052] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0053] See also Figure 1 and Figure 2 , a new type of PID sensor is shown in the figure, including a sensor housing 100, a sensor PCB board 200, a vacuum ultraviolet lamp 300, a detector 400 and a temperature and humidity sensor 500.

[0054] The sensor housing 100 is a cylindrical structure. The sensor PCB board 200 is installed in the sensor housing 100 , and a lamp hole 210 is opened in the sensor PCB board 200 .

[0055] The vacuum ultraviolet lamp 300 is installed in the sensor housing 100 and connected to the sensor PCB board 200 . The lamp window portion 310 of the vacuum ultraviolet lamp 300 passes through the lamp hole 210 of the sensor PCB board 200 .

[0056] See also Figure 3 Combined with Figure 1 and Figure 2 , the detector 400 is installed in the sensor housing 100 and is located above the sensor PCB board 200. The detector 400 includes a detector housing 410, an electrode sheet assembly 420 and an electric heating sheet assembly 430. The detector housing 410 is provided with a receiving through hole 411 at a position above the vacuum ultraviolet lamp 300. The lamp window part 310 of the vacuum ultraviolet lamp 300 is received in the receiving through hole 411. The electrode sheet assembly 420 is arranged in the detector housing 410. An ionization chamber 423 is formed in the electrode sheet assembly 420 above the lamp window part 310 of the vacuum ultraviolet lamp 300. The electric heating sheet assembly 430 is arranged in the detector housing 410 and is located above the electrode sheet assembly 420 and is connected to the sensor PCB board 200. It is used to heat the gas entering the ionization chamber 423 and its surrounding environment. When the temperature in the ionization chamber 423 and its surrounding environment increases, according to the principle of thermodynamics, its relative humidity will decrease. For example, when the external environment temperature of the new PID sensor of the present invention is 0°C to 40°C, the temperature in the ionization chamber 423 and its surrounding environment rises by 5°C. According to the thermodynamic principles, the relative humidity in the ionization chamber 423 and its surrounding environment will drop to below 80%, so that the water vapor in the gas will not condense in the ionization chamber 423, ensuring that the sensor can work normally.

[0057] The distance between the lower end surface of the electric heating plate assembly 430 and the upper end surface of the electrode plate assembly 420 is preferably 0.2mm to 3.4mm. If it is too close, a short circuit will affect the electrical performance. If it is too far, the sensor height will be increased and the uncertainty of heat exchange of the gas in the ionization chamber 423 and its surrounding environment will be increased.

[0058] The temperature and humidity sensor 500 is arranged on the sensor PCB board 200 and is close to the ionization chamber 423 and connected to the sensor PCB board 200. The temperature and humidity conditions of the surrounding environment of the ionization chamber 423 are monitored in real time through the temperature and humidity sensor 500. The operation of the electric heating plate assembly 430 is controlled according to the monitored temperature and humidity conditions, and the humidity in the ionization chamber 423 and its surrounding environment is controlled more timely and efficiently to ensure the normal operation of the sensor. At the same time, the gas concentration measured by the sensor can be corrected in real time according to the monitored temperature and humidity values ​​to obtain more accurate results.

[0059] In this embodiment, the electrode sheet assembly 420 adopts a three-electrode structure, which includes an electrode sheet 421 and electrode pins 422a, 422b, and 422c.

[0060] The electrode sheet 421 is formed by stacking upper and lower PCB electrode plates 421a and 421b. In this embodiment, the upper and lower PCB electrode plates 421a and 421b are preferably Teflon PCB plates. The electrode sheet 421 is located above the lamp window portion 310 of the vacuum ultraviolet lamp 300 and is provided with a plurality of ionization through holes 4211 passing through the upper and lower PCB electrode plates 421a and 421b. The plurality of ionization through holes 4211 constitute an ionization chamber 423.

[0061] The electrode pins 422a, 422b, 422c are inserted on the electrode sheet 421 at intervals and connected to the sensor PCB board 200. In this embodiment, the electrode pins 422a, 422b, 422c are preferably copper pins. Specifically, the electrode pin 422a is connected to the upper PCB electrode plate 421a and its tip portion passes through the electrode pin through-hole 412 opened on the detector housing 410 and is inserted into the corresponding electrode hole 220 formed on the sensor PCB board 200. The electrode pin 422b is connected to the lower PCB electrode plate 421b and its tip portion passes through the electrode pin through-hole 412 opened on the detector housing 410 and is inserted into the corresponding electrode hole 220 formed on the sensor PCB board 200. The electrode pin 422c is connected to the upper and lower PCB electrode plates 421a and 421b and its tip portion passes through the electrode pin through-hole 412 opened on the detector housing 410 and is inserted into the corresponding electrode hole 220 formed on the sensor PCB board 200.

[0062] The detector housing 410 is provided with a clearance window 413 at a position above the temperature and humidity sensor 500, and the electrode sheet 421 is provided with a clearance window 4212 at a position above the temperature and humidity sensor 500, which is connected to the clearance window 413. During installation, the temperature and humidity sensor 500 is located in the clearance window 413 and the clearance window 4212, which can effectively reduce the thickness of the detector 400 and save space.

[0063] See 4 and Figure 5 Combined with Figure 3 , the figure shows a specific embodiment of the electric heating plate assembly. The electric heating plate assembly 430 in this embodiment includes a grid strip heating plate 431, a grid fixing plate 432, an insulating spacer 433 and heating pins 434 and 435.

[0064] The grid strip heating plate 431 is cut into grid strips 4311 of fixed width from a metal sheet. Two adjacent grid strips 4311 are connected head to tail to form a series electrical connection between the grid strips to obtain a large resistance value. A gap is formed between two adjacent grid strips 4311 as electrical insulation between the two adjacent grid strips 4311. These gaps constitute the air permeable gap 4312 of the grid strip heating plate 431, allowing gas to pass through for gas exchange. The grid strip heating plate 431 is provided with an avoidance through hole 4313 for avoiding the electrode pins 422a, 422b, 422c of the electrode sheet assembly 420.

[0065] The grid fixing plate 432 is set on the upper end surface of the grid strip heating plate 431 by gluing. The grid fixing plate 432 is located above the ionization chamber 423 and the temperature and humidity sensor 500 and has a ventilation window 4321 to allow gas to pass through for gas exchange.

[0066] The insulating spacer 433 is arranged on the lower end surface of the grid strip heating plate 431. The insulating spacer 433 is provided with a ventilation window 4331 at a position above the ionization chamber 423 and the temperature and humidity sensor 500, allowing gas to pass through for gas exchange. The insulating spacer 433 is provided with an avoidance through hole 4332 for avoiding the electrode pins 422a, 422b, and 422c of the electrode sheet assembly 420. The insulating spacer 433 isolates the grid strip heating plate 431 from the metal copper-clad electrical conduction on the electrode sheet assembly 420, and at the same time determines and maintains the isolation distance between the two. In addition, the insulating spacer 433 also guides the heat generated by the grid strip heating plate 431 to the metal copper-clad surface of the electrode sheet assembly 420, which is conducive to preventing water vapor from condensing on the electrode sheet assembly 420. Preferably, the insulating spacer 433 is made of a flat, rigid, shape-retaining, and thermally conductive non-conductive material.

[0067] The heating pins 434 and 435 are correspondingly inserted into the insertion holes 4314 formed on both sides of the grid strip heating plate 431. The heating pins 434 and 435 pass through the pin through holes 4333 of the insulating spacer 433 and the heating pin through holes 414 of the detector housing 410 and are correspondingly inserted into the heating sockets 230 formed on the sensor PCB board 200. In order to simplify the structure, the heating pins 434 may be shared with the electrode pins 422c of the aforementioned electrode sheet assembly 420.

[0068] The grid fixing plate 432 can prevent the grid bars 4311 on the grid strip heating plate 431 from being scattered disorderly. The grid strip heating plate 431 can be assembled with the heating pins 434 and 435 and bonded as a whole, and then installed on the insulating spacer 433, which effectively improves the overall structural stability.

[0069] See also Figure 6 and Figure 7 , another specific embodiment of the electric heating plate assembly is shown in the figure. Figure 4 and Figure 5 The structures of the electric heating plate assemblies shown in are roughly the same, except that:

[0070] The air permeable window 4321' in the middle of the grid fixing plate 432' in the electric heating plate assembly 430' is divided into two independent windows by a partition 4322', and the air permeable window 4331' in the middle of the insulating partition 433' in the electric heating plate assembly 430' is divided into two independent windows by a partition 4334', so that the ozone and other highly corrosive gases generated by the ionization chamber will not diffuse into the temperature and humidity sensor element room, thereby avoiding damage to the temperature and humidity sensor element 500.

[0071] See also Figure 8 and Fig. 9 , the figure shows another specific embodiment of the electric heating plate assembly, in which the electric heating plate assembly 430a includes a plate-type winding frame 431a, a heating wire 432a, an insulating spacer 433a and heating pins 434a, 435a.

[0072] The chip winding frame 431a is provided with a ventilation window 4311a at a position above the ionization chamber 423 and the temperature and humidity sensor 500, and the chip winding frame 431a is provided with power connection holes 4312a and 4313a on both sides of the ventilation window 4311a.

[0073] The heating wire 432a is wound on the sheet-type winding frame 431a at intervals and covers the ventilation window 4311a. One end of the heating wire 432a is connected to the power connection hole 4312a, that is, it is wound several turns in the power connection hole 4312a, and the other end is connected to the power connection hole 4313a, that is, it is wound several turns in the power connection hole 4313a. In order to ensure the winding effect of the heating wire 432a, the outer peripheral edge of the sheet-type winding frame 431a is located at both sides of the ventilation window 4311a. A plurality of tooth-shaped fixing grooves 4314a arranged at intervals are formed, and the heating wire 432a is wound on the plurality of tooth-shaped fixing grooves 4314a of the sheet-type winding frame 431a.

[0074] The insulating spacer 433a is disposed on the lower end surface of the sheet winding frame 431a, and a ventilation window 4331a is provided on the insulating spacer 433a at a position above the ionization chamber 423 and the temperature and humidity sensor 500. The insulating spacer 433a is provided with an escape through hole 4332a for escaping the electrode pins 422a, 422b, 422c of the electrode sheet assembly 420.

[0075] The heating pins 434a and 435a are inserted into the power connection holes 4312a and 4313a of the sheet winding frame 431a. The heating pins 434a and 435a pass through the pin through holes 4333a of the insulating spacer 433a and the heating pin through holes 414 of the detector housing 410 and are correspondingly inserted into the heating sockets 230 formed on the sensor PCB board 200.

[0076] The detector 400 of the present invention further comprises a waterproof breathable membrane 440, which is arranged on the detector 400 and located above the electric heating plate assembly 430 to prevent external water from entering the interior of the sensor and ensure the normal operation of the sensor.

[0077] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Technical personnel in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected. For example, the function of the electrode sheet assembly is to form an ionization chamber. Due to differences in concepts, the configurations of various manufacturers vary greatly. However, from the description of this patent document, it can be seen that the application of the utility model has little to do with the configuration of the electrode sheet assembly, and they are all applicable and should be within the scope of protection of this patent. The scope of protection required by the present utility model is defined by the attached claims and their equivalents.

Claims

1. A new type of PID sensor, comprising: Sensor housing; A sensor PCB board installed in the sensor housing, wherein a lamp hole is opened in the sensor PCB board; A vacuum ultraviolet lamp installed in the sensor housing and connected to the sensor PCB, wherein a lamp window of the vacuum ultraviolet lamp passes through a lamp hole of the sensor PCB; A detector installed in the sensor housing and located above the sensor PCB board, the detector comprising a detector housing and an electrode sheet assembly arranged in the detector housing, the detector housing being provided with an accommodating through hole for accommodating a lamp window portion of the vacuum ultraviolet lamp at a position above the vacuum ultraviolet lamp, and an ionization chamber being formed in the electrode sheet assembly above the lamp window portion of the vacuum ultraviolet lamp; characterized in that: An electric heating plate assembly connected to the sensor PCB board is arranged above the electrode plate assembly in the detector housing and is used to heat the gas entering the ionization chamber and its surrounding environment.

2. The novel PID sensor as claimed in claim 1, characterized in that: A temperature and humidity sensor connected to the sensor PCB board is arranged at a position on the sensor PCB board close to the ionization chamber.

3. The novel PID sensor as claimed in claim 2, characterized in that: The distance between the lower end surface of the electric heating sheet assembly and the upper end surface of the electrode sheet assembly is 0.2 mm to 3.4 mm.

4. The novel PID sensor as claimed in claim 2, characterized in that: The electric heating plate assembly comprises: A grid strip heating plate, wherein a ventilation gap is formed in the grid strip heating plate; A grid fixing plate is arranged on the upper end surface of the grid strip heating plate, and a first ventilation window is opened at a position of the grid fixing plate above the ionization chamber and the temperature and humidity sensor; A first insulating spacer is provided on the lower end surface of the grid strip heating plate, wherein the first insulating spacer is provided with a second ventilation window at a position above the ionization chamber and the temperature and humidity sensor; and The first and second heating pins are inserted on both sides of the grid strip heating plate. The first and second heating pins pass through the first insulating spacer and the detector housing and are correspondingly inserted into the heating holes formed on the sensor PCB board.

5. The novel PID sensor as claimed in claim 4, characterized in that: The grid strip heating plate is made of a metal sheet cut into grid strips of fixed width, two adjacent grid strips are connected head to tail to form a series electrical connection between the grid strips, and the gap between the two adjacent grid strips forms the air permeable gap.

6. The novel PID sensor as claimed in claim 4, characterized in that: The grid strip heating plate and the first insulating spacer are respectively provided with avoidance through holes for avoiding the electrode pins of the electrode plate assembly.

7. The novel PID sensor as claimed in claim 4, characterized in that: The first air permeable window of the grid fixing plate in the electric heating plate assembly is divided into two independent windows by a partition, and the second air permeable window of the first insulating spacer in the electric heating plate assembly is divided into two independent windows by a partition.

8. The novel PID sensor as claimed in claim 2, characterized in that: The electric heating plate assembly comprises: A sheet-type winding frame, wherein the sheet-type winding frame is provided with a third ventilation window at a position above the ionization chamber and the temperature and humidity sensor, and the sheet-type winding frame is provided with a first power connection hole and a second power connection hole on both sides of the third ventilation window; An electric heating wire wound at intervals on the sheet-type winding frame and covering the third ventilation window, one end of the electric heating wire being connected to the first power connection hole, and the other end thereof being connected to the second power connection hole; a second insulating spacer disposed on the lower end surface of the sheet-type winding frame, wherein the second insulating spacer is provided with a fourth ventilation window at a position above the ionization chamber and the temperature and humidity sensor; and The third heating pin and the fourth heating pin are inserted into the first power connection hole and the second power connection hole of the sheet-type winding frame. After passing through the second insulating spacer and the detector shell, the third heating pin and the fourth heating pin are correspondingly inserted into the heating holes formed on the sensor PCB board.

9. The novel PID sensor as claimed in claim 8, characterized in that: A plurality of tooth-shaped fixing grooves arranged at intervals are formed on the outer periphery of the sheet-type winding frame at positions on both sides of the third ventilation window, and the heating wire is wound on the plurality of tooth-shaped fixing grooves of the sheet-type winding frame.

10. The novel PID sensor as claimed in claim 8, characterized in that: The second insulating spacer is provided with an escape through hole for escaping the electrode pins of the electrode sheet assembly.

11. The novel PID sensor according to any one of claims 2 to 10, characterized in that: The electrode sheet assembly comprises: An electrode sheet, wherein the electrode sheet is formed by stacking upper and lower PCB electrode plates, and the electrode sheet is located above the lamp window of the vacuum ultraviolet lamp and is provided with a plurality of ionization through holes passing through the upper and lower PCB electrode plates, and the plurality of ionization through holes constitute the ionization chamber; and The first, second and third electrode pins are inserted on the electrode sheet at intervals and connected to the sensor PCB board.

12. The novel PID sensor according to claim 11, characterized in that: The first electrode pin is connected to the upper PCB electrode plate and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board. The second electrode pin is connected to the lower PCB electrode plate and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board. The third electrode pin is connected to the upper and lower PCB electrode plates and its tip portion passes through the detector shell and is inserted into the corresponding electrode hole formed on the sensor PCB board.

13. The novel PID sensor according to claim 11, characterized in that: The upper and lower PCB electrode plates are Teflon PCB plates, and the first, second and third electrode pins are copper pins.

14. The novel PID sensor according to claim 11, characterized in that: The detector housing is provided with a first makeshift window at a position above the temperature and humidity sensor, and the electrode sheet is provided with a second makeshift window connected to the first makeshift window at a position above the temperature and humidity sensor; when installed, the temperature and humidity sensor is located in the first makeshift window and the second makeshift window.

15. The novel PID sensor according to claim 11, characterized in that: A waterproof and breathable membrane is arranged on the detector housing above the electric heating plate assembly.

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