Multifunctional photoionization PID detector

Abstract

The utility model provides a multifunctional photoionization PID (Proportion Integration Differentiation) detector, which comprises a complete machine shell and a PID sensor, the PID sensor comprises an outer cylinder cover and a sensor sleeve; the outer cylinder cover is screwed at one end of the sensor sleeve and forms an accommodating cavity with the sensor sleeve; an ionization gas chamber, an ultraviolet lamp and a fixed framework with a cavity inside are sequentially arranged in the accommodating cavity; the ionization gas chamber comprises a gas chamber body, an upper gas chamber cover, a lower gas chamber cover and an electrode circuit board; the electrode circuit board is arranged behind the upper air chamber cover, a switching circuit board is arranged behind the lower air chamber cover, and four conductive screws on the upper air chamber cover are inserted into four sleeves on the switching circuit board; one end of the ultraviolet lamp is sleeved in the lower air chamber cover, and the other end of the ultraviolet lamp is pressed in the cavity of the fixed framework through a spring ring; and a sensor main control board is fixedly arranged on the fixed framework. Due to the detachable structural design of the outer cylinder cover, the ultraviolet lamp and the like, the electrode of the ionization gas chamber can be quickly detached and cleaned, and the ultraviolet lamp can be replaced.

Description

Technical Field

[0001] The invention patent relates to the field of VOC gas detection, in particular to a multifunctional photoionization PID detector. Background Art

[0002] PID is the abbreviation of Photo Ionization Detection, which is basically composed of a UV light source, an ionization chamber and a current detector. The UV light source usually uses a low-pressure mercury lamp to emit UV light with a wavelength of 10.6 eV. The light energy of this wavelength is high enough to cause the molecules in the sample to absorb photons and ionize. The ionization chamber is located below the light source. When the sample gas passes through the ionization chamber, after being irradiated by UV light, the VOC molecules in it absorb photons and ionize. These ionized molecules are attracted by the electric field to form an ion flow. After the ion flow enters the current detector, a current signal is generated. The magnitude of the current is proportional to the VOC concentration in the sample. The working principle of PID is based on the characteristics of VOC molecules being ionized under UV light. VOC molecules of different concentrations have different ionization energies, so different VOC molecules will generate current signals of different sizes under the same light source. By measuring the magnitude of the current signal, the concentration of VOC gas in the sample can be determined. After the gas to be tested is detected, the ions can recombine into the original gas. The photoionization (PID) detector is a non-destructive instrument mainly used for the detection of volatile organic VOC gases.

[0003] The market demand characteristics for portable VOC (volatile organic compound) gas detectors mainly include:

[0004] ①. Portability: Portable VOC gas detectors need to be lightweight and compact, making them easy for users to carry and use. This way, users can perform gas detection anytime and anywhere, whether indoors or outdoors;

[0005] ② Sensitivity and accuracy: The market has high requirements for the sensitivity and accuracy of portable VOC gas detectors. Users hope to accurately detect low-concentration VOC gases and provide reliable measurement results;

[0006] ③. Versatility: The market demand for portable VOC gas detectors also includes versatility. Some users also hope that it can provide data recording and storage functions for subsequent analysis and report generation. It has a positioning module to record location information during use. When the environmental protection department inspects the pollutant discharge unit, it has the function of printing inspection certificates on site;

[0007] ④. Easy to operate: The market requires that the operation of portable VOC gas detectors should be simple and easy to understand. Users hope to quickly obtain information on gas concentration through simple operations;

[0008] ⑤. Durability and reliability: Since portable VOC gas detectors often need to be used in harsh environmental conditions, the market has high requirements for their durability and reliability. Users hope that it can withstand long-term use and the test of various environments.

[0009] Most portable VOC gas detectors on the market today are generally portable, sensitive and accurate, but lack corresponding product functions and structural designs in terms of versatility, durability and reliability. Utility Model Content

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0011] The utility model provides a multifunctional photoionization PID detector, comprising: a whole machine housing and a PID sensor 313 arranged in the whole machine housing; the PID sensor 313 comprises an outer cylinder cover 201 and a sensor sleeve 216; the outer cylinder cover 201 is screwed on one end of the sensor sleeve 216 to form a receiving cavity with the sensor sleeve 216; an ionization gas chamber, an ultraviolet lamp 208 and a fixed skeleton 215 with a cavity are sequentially arranged in the receiving cavity; the ionization gas chamber comprises a gas chamber body, an upper gas chamber cover 202 and a lower gas chamber cover 206 respectively arranged at the ends of the gas chamber body, and an electrode circuit board 204 arranged in the gas chamber body; four conductive screws 203 are arranged on the upper gas chamber cover 202; the electrode circuit board 204 is arranged behind the upper gas chamber cover 202, and is provided with positive and negative electrode sheets 205 and four conductive holes for receiving ionized electrons; a transfer circuit board 212 is arranged behind the lower gas chamber cover 206, Four sleeves 213 are arranged on the adapter circuit board 212; four conductive screws 203 contact and penetrate the conductive holes of the electrode circuit board 204, and are inserted into the four sleeves 213 on the adapter circuit board 212; two conductive screws 203 are used to form 120V high-voltage electrodes for ionizing electric fields, and the other two conductive screws 203 are electrically connected to the positive and negative electrode sheets 205 respectively to receive moving electrons; one end of the ultraviolet lamp 208 is arranged close to the lower air chamber cover 206 and is located between the four conductive screws 203; one end of the ultraviolet lamp 208 is provided with two copper rings 207 as high-voltage excitation electrodes, and the other end is provided with a spring ring 209; the ultraviolet lamp 208 is pressed into the cavity of the fixed skeleton 215 through the spring ring 209; a sensor main control board 214 is fixedly arranged on the fixed skeleton 215; the sensor main control board 214 is electrically connected to the adapter circuit board 212 and the two copper rings 207 of the ultraviolet lamp 208 respectively.

[0012] Based on the above, a temperature and humidity sensor for measuring the current ambient temperature and humidity is provided on the adapter circuit board 212 .

[0013] Based on the above, a photosensor 210 for detecting the luminous intensity of the ultraviolet lamp 208 is disposed on the adapter circuit board 212 .

[0014] Based on the above, the upper air chamber cover 202 , the lower air chamber cover 206 and the fixed frame 215 are all made of polytetrafluoroethylene.

[0015] Based on the above, the whole housing includes a panel 301, a rubber button 302, an upper shell 303, a circuit main board 305, a shell sealing ring 314 and a bottom shell 319; the rubber button 302 is arranged on the upper shell 303, and the panel 301 is buckled on the upper shell 303; a buzzer 306 is welded on the circuit main board 305, a rubber sealing ring 304 is attached to the buzzer 306, and the upper shell 303 presses the rubber sealing ring 304 and is arranged on the circuit main board 305; an LCD display screen 309 and a white LED lamp 310 are also welded on the circuit main board 305; the upper shell 303 is installed on the lower shell 319 through the shell sealing ring 314; the PID sensor 313 is fixed in the hole at the upper end of the bottom shell 319, and is pressed by a pressure on the sensor sleeve 216 The locking ring 312 is locked; an air pump groove is provided in the middle of the bottom shell 319, and an air pump 320 is fixed in the air pump groove by a cover plate 318; an air outlet hole 321 is opened on the side wall of the bottom shell 319, and an air outlet component 315 is fixed to the air outlet hole 321 through an O-ring 316 and a nut 317; the air outlet component 315 and the ionization gas chamber are respectively connected to the air pump 320; a rechargeable lithium battery 401 and a battery protection board 404 are provided in the hole at the lower end of the bottom shell 319, and the rechargeable lithium battery 401 is welded to the battery protection board 404 through a wire; a charging contact 402 composed of 4 charging probes is provided at the lower end of the bottom shell 319; a spring pin 403 is welded on the battery protection board 404, and the spring pin 403 is used to contact the circuit main board 305 to provide power.

[0016] Based on the above, a GPS+Beidou dual-mode positioning module 307 and a Bluetooth ble module 308 are also welded on the circuit main board 305 .

[0017] Based on the above, the charging contacts 402 are injection molded onto the bottom shell 319 .

[0018] Based on the above, the rechargeable lithium battery 401 and the battery protection board 404 are potted with epoxy resin sealant 405 .

[0019] Based on the above, the detector also includes a water trap filter 103; the air inlet 102 of the water trap filter 103 is used to connect with the air pipe or the telescopic probe 101, and the air outlet of the water trap filter 103 is used to tighten the water trap filter 103 onto the PID sensor 313 through the Luer connector 104.

[0020] The utility model has substantial features and progress compared with the prior art, specifically:

[0021] 1. The whole shell of the utility model adopts a waterproof structure design, which ensures that it can be used on rainy days; through the detachable structure design of the outer cylinder cover, ultraviolet lamp, etc., the ionization chamber electrode can be quickly disassembled and cleaned, and the ultraviolet lamp can be replaced;

[0022] 2. A water trap filter is added to the air inlet of the PID sensor of the utility model to filter out the influence of water vapor on the sensor; a temperature and humidity sensor is installed inside the PID sensor. Under different temperature and humidity environments, the instrument can switch to different calibration curves, and the user can also adjust the flow rate of the vacuum pump according to the temperature to achieve the maximum detection accuracy; a photosensor is also installed inside the PID sensor to determine whether the ultraviolet lamp is faulty.

[0023] 3. The PID detector of this utility model is equipped with a GPS+Beidou dual-mode positioning module. The real-time data has GPS positioning information. Users can accurately record and mark the location of each test, which is convenient for subsequent data analysis and report generation. By connecting to a Bluetooth printer, users can print out the test results in real time.

[0024] 4. The multifunctional photoionization PID detector of the utility model has an intrinsically safe design by using epoxy resin sealant to seal the rechargeable lithium battery and the battery protection board, and has a high protection level, ensuring that the instrument can be used in dangerous places with explosion-proof requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the whole machine of the utility model multifunctional photoionization PID detector.

[0026] Figure 2 This is an exploded view of the PID sensor of the multifunctional photoionization PID detector.

[0027] Figure 3 It is a cross-sectional view of the PID sensor of the multifunctional photoionization PID detector.

[0028] Figure 4 This is an exploded view of the multifunctional photoionization PID detector.

[0029] Figure 5 This is a cross-sectional view of the interior of the bottom shell of the multifunctional photoionization PID detector. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] This embodiment provides a multifunctional photoionization PID detector. Figure 1 The figure shows a schematic diagram of the whole machine, including a whole machine housing, a water trap filter 103 and a PID sensor 313 disposed in the whole machine housing;

[0032] The water trap filter 103 is screwed onto the Luer connector 104. The Luer connector 104 is made of stainless steel and is screwed onto the PID sensor 313. There is an O-ring in the middle for sealing, ensuring that the gas path is leak-proof and waterproof to prevent water vapor from entering. The entire housing is provided with an alarm indication window 105, an LCD screen display window 106, a button 107 and a buzzer sound hole 108; the LED light of the alarm indication window 105 lights up in different colors to indicate an alarm or fault; the LCD screen display window 106 is used for user interaction and can display an operation menu, VOC gas concentration data, etc.; the button 107 includes four buttons: confirmation, return, select up, and select down, which are used by the user to operate and set the detector; when an alarm occurs, the alarm sound can be transmitted through the buzzer sound hole 108.

[0033] The water trap filter 103 contains a filter membrane inside, which can block and absorb dust, particles and water vapor above 45um, prevent water vapor and small foreign matter from entering the PID sensor 313, improve the stability of the measurement data of the PID sensor 313, and reduce the influence of water vapor and dust on the PID sensor 313. The water trap filter 103 includes an air inlet 102, which can be connected to the air pipe or the telescopic probe 101. Since the air intake method of the PID detector of this embodiment is pump suction, it can be connected to an air pipe no longer than 30 meters, and measure deep wells or harsh environments where people cannot reach or stay; the telescopic probe 101 can be made of metal stainless steel, and can penetrate into chimneys and other environments with high temperatures for detection.

[0034] Figure 2 The figure shows an exploded view of the PID sensor of the PID detector of this embodiment. Figure 3 The PID sensor 313 of the PID detector of this embodiment is shown in a cross-sectional view. The PID sensor 313 includes an outer tube cover 201 and a sensor sleeve 216.

[0035] The Luer connector 104 is screwed onto the outer tube cover 201 by screws, and the outer tube cover 201 is screwed onto one end of the sensor sleeve 216 by an O-ring 217 to form a receiving cavity with the sensor sleeve 216, and the middle O-ring 217 plays a waterproof role. The outer tube cover 201, the Luer connector 104 and the sensor sleeve 216 are all made of stainless steel, and the metal material can effectively shield electromagnetic interference and improve the stability of the PID sensor measurement data.

[0036] The accommodating cavity is provided with an ionization chamber, an ultraviolet lamp 208, and a fixed frame 215 with a cavity therein in sequence; the ionization chamber includes a chamber body, an upper chamber cover 202 and a lower chamber cover 206 respectively provided at the ends of the chamber body, and an electrode circuit board 204 provided in the chamber body. The upper chamber cover 202 is provided with an air inlet connected to the ionization chamber, and the lower chamber cover 206 is provided with an air outlet connected to the ionization chamber.

[0037] The upper air chamber cover 202 is provided with four conductive screws 203; the electrode circuit board 204 is arranged behind the upper air chamber cover 202, and is provided with positive and negative electrode sheets 205 and four conductive holes for receiving ionized electrons; a transfer circuit board 212 is arranged behind the lower air chamber cover 206, and four sleeves 213 are arranged on the transfer circuit board 212;

[0038] The four conductive screws 203 are in contact with the conductive holes on the electrode circuit board 204 to achieve electrical connection. Two of the four conductive screws 203 are 120V high-voltage electrodes, forming an electric field to promote the movement of ionized electrons to form a current. The other two conductive screws 203 are electrically connected to the electrode sheet 205. The electrode sheet 205 has two electrode sheets, one positive electrode sheet and one negative electrode sheet, which receive the moving electrons and form a weak current on the two electrode sheets. The four conductive screws 203 are inserted into the four sleeves 213 on the adapter circuit board 212 to achieve electrical connection. The plug-in method ensures electrical connection while facilitating production and assembly, reducing the complexity of assembly.

[0039] One end of the ultraviolet lamp 208 is arranged close to the lower air chamber cover 206 and is located between the four conductive screws 203; one end of the ultraviolet lamp 208 is provided with two copper rings 207 as high-voltage excitation electrodes, and the other end is provided with a spring ring 209; the two copper rings 207 are high-voltage excitation electrodes of the ultraviolet lamp 208, and the copper rings 207 generate 1KV high voltage to excite the ultraviolet lamp to light up, and the energy of the ultraviolet lamp is 10.6ev, which ionizes the VOC gas flowing into the ionization air chamber into electrons and ions;

[0040] The ultraviolet lamp 208 is pressed into the cavity of the fixed frame 215 through the spring ring 209, and a sensor main control board 214 is fixedly arranged on the fixed frame 215. The sensor main control board 214 is electrically connected to the adapter circuit board 212 and the two copper rings 207 of the ultraviolet lamp 208 respectively;

[0041] After removing the outer cylinder cover 201, the spring ring 209 can automatically pop out the ultraviolet lamp 208, making it convenient to remove and replace the ultraviolet lamp 208. A temperature and humidity sensor 211 is welded on the adapter circuit board 212, which is used to measure the temperature and humidity of the current environment and transmit these data to the PID sensor. The PID sensor will perform internal calculations and corrections based on the temperature and humidity data to adjust the measurement value of its output so that it can more accurately reflect the actual gas concentration. Users can also adjust the flow rate of the vacuum pump according to the temperature to achieve the maximum detection accuracy. A photosensitive sensor 210 is also welded on the adapter circuit board 212. Whether the ultraviolet lamp 208 is on and the intensity of the light can be measured by the photosensitive sensor 210, so as to determine whether the ultraviolet lamp 208 is faulty;

[0042] The sensor main control board 214 includes a current signal conditioning circuit, a controller, a memory, etc., and is used to collect, amplify, process and forward the current signal.

[0043] Preferably, the upper air chamber cover 202, the lower air chamber cover 206 and the fixed frame 215 are made of polytetrafluoroethylene, which is a stable material that does not volatilize interfering gases, has no adsorption effect on VOC gases, and has no effect on the accuracy of measuring gas.

[0044] The outer cylinder cover 201 of this embodiment can be disassembled by hand without the aid of tools, and the electrode circuit board 204 can be taken out after disassembly, which is convenient for the user to clean the electrode sheet 205 after disassembly. After taking out the electrode circuit board 204 and the lower air chamber cover 206, the ultraviolet lamp 208 is automatically ejected through the spring ring 209.

[0045] Figure 4 The figure shows the exploded view of the whole machine of the PID detector of this embodiment. Figure 5 The bottom shell of the PID detector of this embodiment is shown in FIG. The whole shell includes a panel 301 , a rubber button 302 , an upper shell 303 , a circuit board 305 , a shell sealing ring 314 and a bottom shell 319 .

[0046] The panel 301 is made of aluminum to avoid static electricity from interfering with the circuit during use, thereby improving the stability of the PID sensor detection data. The rubber button 302 is arranged on the upper shell 303, and the panel 301 is buckled on the upper shell 303, which can effectively press the rubber button 302 and achieve a waterproof effect;

[0047] A buzzer 306 is welded on the circuit main board 305, and the sound can be transmitted through the buzzer sound hole 108; a rubber sealing ring 304 is attached to the buzzer 306, and the upper shell 303 can press the rubber sealing ring 304 to achieve a waterproof effect. An LCD display screen 309 and a white LED light 310 are also welded on the circuit main board 305. The LCD display screen 309 is used for user interaction and can display operation menus and VOC gas concentration data. The white LED light 310 can be used for lighting in a dim and enclosed place;

[0048] The PID sensor 313 is fixed in the hole at the upper end of the bottom shell 319 and is locked by a compression lock ring 312 provided on the sensor sleeve 216; the sensor sleeve 216 is also provided with an O-ring 311 for waterproofing;

[0049] The upper shell 303 is mounted on the lower shell 319 through the shell sealing ring 314; an air pump groove is provided in the middle of the bottom shell 319, and an air pump 320 is fixed in the air pump groove by a cover plate 318, and the air inlet of the air pump 320 is connected to the air outlet of the ionization chamber through an air pipe; an air outlet hole 321 is opened on the side wall of the bottom shell 319, and an air outlet component 315 is fixed to the air outlet hole 321 through an O-ring 316 and a nut 317, and the air outlet component 315 is connected to the air outlet of the air pump 320, and the O-ring 316 plays a waterproof role;

[0050] A rechargeable lithium battery 401 and a battery protection board 404 are arranged in the hole at the lower end of the bottom shell 319. The rechargeable lithium battery 401 is welded to the battery protection board 404 through a wire and is used to power the detector. A charging contact 402 is arranged at the lower end of the bottom shell 319. The charging contact 402 is composed of 4 charging probes and is injection molded onto the bottom shell 319 through a mold to charge the rechargeable lithium battery 401 through the charging contact 402; the mold injection molding process ensures airtightness and achieves a waterproof effect. A spring pin 403 is welded on the battery protection board 404. The spring pin 403 is used to contact the circuit main board 305 to provide power. There is no wire connection, which reduces the complexity of assembly. The rechargeable lithium battery 401 and the battery protection board 404 are potted with epoxy resin sealant 405 to ensure the safety of the rechargeable lithium battery and the charging circuit, and achieve an intrinsically safe and explosion-proof effect.

[0051] Preferably, the circuit main board 305 is also welded with a GPS+Beidou dual-mode positioning module 307 and a Bluetooth ble module 308; the GPS+Beidou dual-mode positioning module 307 has its own antenna, which can obtain the latitude and longitude positioning information during measurement, and the user can accurately record and mark the location of each detection, which is convenient for subsequent data analysis and report generation. The GPS+Beidou dual-mode positioning module 307 can also record the data monitoring performed by the PID detector at different locations, so that the user can replay and view historical data at any time, which is very useful for environmental monitoring and safety assessment, and can help users understand the trend of gas concentration changes at different locations and identify potential risks and problems.

[0052] The Bluetooth BLE module is a low-power module that can be connected to a portable Bluetooth printer to print test data. This makes it convenient for users to record and back up data on site, reducing the workload of subsequent data sorting. Users can also print out the test results directly and share them with colleagues, customers or relevant personnel to promote information exchange and decision-making.

[0053] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A multifunctional photoionization PID detector, characterized in that: include: A whole machine housing and a PID sensor (313) arranged in the whole machine housing; The PID sensor (313) comprises an outer cylinder cover (201) and a sensor sleeve (216); The outer cylinder cover (201) is screwed onto one end of the sensor sleeve (216) to form a receiving cavity with the sensor sleeve (216); An ionization gas chamber, an ultraviolet lamp (208) and a fixed frame (215) with a cavity therein are sequentially arranged in the accommodating cavity; The ionization gas chamber comprises a gas chamber body, an upper gas chamber cover (202) and a lower gas chamber cover (206) respectively arranged at the ends of the gas chamber body, and an electrode circuit board (204) arranged in the gas chamber body; The upper air chamber cover (202) is provided with four conductive screws (203); the electrode circuit board (204) is provided behind the upper air chamber cover (202), and is provided with positive and negative electrode sheets (205) for receiving ionized electrons and four conductive holes; a transfer circuit board (212) is provided behind the lower air chamber cover (206), and is provided with four sleeves (213); Four conductive screws (203) contact and penetrate the conductive holes of the electrode circuit board (204), and are inserted into four sleeves (213) on the adapter circuit board (212); two conductive screws (203) are used to form 120V high-voltage electrodes for an ionizing electric field, and the other two conductive screws (203) are respectively electrically connected to the positive and negative electrode sheets (205) to receive moving electrons; One end of the ultraviolet lamp (208) is arranged in close contact with the lower air chamber cover (206) and is located between four conductive screws (203); one end of the ultraviolet lamp (208) is provided with two copper rings (207) serving as high-voltage excitation electrodes, and the other end is provided with a spring ring (209); the ultraviolet lamp (208) is pressed into the cavity of the fixed frame (215) through the spring ring (209); A sensor main control board (214) is fixedly arranged on the fixed frame (215); the sensor main control board (214) is electrically connected to the adapter circuit board (212) and the two copper rings (207) of the ultraviolet lamp (208), respectively.

2. The multifunctional photoionization PID detector according to claim 1, characterized in that: The adapter circuit board (212) is provided with a temperature and humidity sensor for measuring the current ambient temperature and humidity.

3. The multifunctional photoionization PID detector according to claim 1, characterized in that: The adapter circuit board (212) is provided with a photosensitive sensor (210) for detecting the luminous intensity of the ultraviolet lamp (208).

4. The multifunctional photoionization PID detector according to claim 1, characterized in that: The upper air chamber cover (202), the lower air chamber cover (206) and the fixed frame (215) are all made of polytetrafluoroethylene.

5. The multifunctional photoionization PID detector according to any one of claims 1 to 4, characterized in that: The whole housing comprises a panel (301), a rubber button (302), an upper housing (303), a circuit board (305), a housing sealing ring (314) and a bottom housing (319); The rubber button (302) is arranged on the upper shell (303), and the panel (301) is buckled on the upper shell (303); A buzzer (306) is welded to the circuit main board (305), a rubber sealing ring (304) is attached to the buzzer (306), and the upper shell (303) is pressed against the rubber sealing ring (304) and is arranged on the circuit main board (305); an LCD display screen (309) and a white LED lamp (310) are also welded to the circuit main board (305); The upper shell (303) is mounted on the bottom shell (319) via the shell sealing ring (314); The PID sensor (313) is fixed in a hole at the upper end of the bottom shell (319) and is locked by a compression lock ring (312) provided on the sensor sleeve (216); An air pump groove is provided in the middle of the bottom shell (319), and an air pump (320) is pressed and fixed in the air pump groove via a cover plate (318); The side wall of the bottom shell (319) is provided with an air outlet hole (321), and the air outlet hole (321) is fixed with an air outlet assembly (315) via an O-type sealing ring (316) and a nut (317); The gas outlet component (315) and the ionization gas chamber are respectively connected to the gas pump (320); A rechargeable lithium battery (401) and a battery protection board (404) are arranged in the hole at the lower end of the bottom shell (319), and the rechargeable lithium battery (401) is welded to the battery protection board (404) via a wire; A charging contact (402) consisting of four charging probes is provided at the lower end of the bottom shell (319); A spring pin (403) is welded on the battery protection board (404), and the spring pin (403) is used to contact the circuit main board (305) to provide power.

6. The multifunctional photoionization PID detector according to claim 5, characterized in that: A GPS+Beidou dual-mode positioning module (307) and a Bluetooth BLE module (308) are also welded onto the circuit main board (305).

7. The multifunctional photoionization PID detector according to claim 5, characterized in that: The charging contacts (402) are injection molded onto the bottom shell (319).

8. The multifunctional photoionization PID detector according to claim 5, characterized in that: The rechargeable lithium battery (401) and the battery protection board (404) are potted with epoxy resin sealant (405).

9. The multifunctional photoionization PID detector according to claim 5, characterized in that: The detector also includes a water trap filter (103); The air inlet (102) of the water trap filter (103) is used to connect to the air pipe or the telescopic probe (101), and the air outlet of the water trap filter (103) is used to tighten the water trap filter (103) onto the PID sensor (313) via a Luer connector (104).

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