An oxygen concentration detection and alarm device based on paramagnetic principle

Abstract

This invention relates to the field of gas concentration detection technology and provides an oxygen concentration detection and alarm device based on the paramagnetic principle. The device includes a housing, a gas sampling module, a paramagnetic oxygen sensor module, a signal processing module, a main control module, a power supply module, a communication module, and an alarm module. The paramagnetic oxygen sensor module includes a detection housing and a paramagnetic oxygen measurement component disposed within the detection housing. The oxygen concentration detection and alarm device based on the paramagnetic principle provided by this invention integrates all modules onto a single housing, resulting in a compact structure, high functional integration, and a smaller overall size for easier installation. The paramagnetic oxygen sensor module further enhances the detection accuracy, environmental adaptability, stability, and lifespan of the device, overcoming the shortcomings of traditional oxygen detectors, such as short lifespan and unpredictable failure dates.

Description

Technical Field

[0001] This invention relates to the field of gas concentration detection technology, specifically to an oxygen concentration detection alarm device based on the paramagnetic principle. Background Technology

[0002] Oxygen concentration monitoring is a crucial step in ensuring safety in industrial production, the effectiveness of medical treatments, and the safety of personnel in special environments. In industrial settings, excessively low oxygen concentrations can easily lead to oxygen deficiency and asphyxiation, while excessively high oxygen concentrations increase the risk of flammable materials igniting or exploding. In medical settings, oxygen concentrations must be precisely controlled within a certain range; abnormal oxygen concentrations can directly affect patient recovery and even endanger lives. Therefore, oxygen concentration detection and alarm devices are needed to monitor oxygen concentrations in various scenarios.

[0003] The existing oxygen concentration detection alarm devices mainly fall into three categories in terms of oxygen detection technology. The first is the electrochemical method, which is low in cost but has a short lifespan for its core components and is easily affected by interfering gases such as H2S and CO, with a sharp drop in accuracy at low temperatures. The second is the thermomagnetic method, which has a longer lifespan but a slow response speed, poor accuracy in low-concentration detection, and is also bulky and inconvenient to install. The third is the paramagnetic method, which has no consumable components and strong anti-interference capabilities, making it the preferred choice for high-precision detection. However, traditional paramagnetic devices have a loose structure, dispersed modules, and a large overall size, making them difficult to adapt to small installation spaces. Summary of the Invention

[0004] This invention proposes an oxygen concentration detection and alarm device based on the paramagnetic principle, which features a compact structure, high functional integration, fast response speed, and high detection accuracy.

[0005] An oxygen concentration detection and alarm device based on the paramagnetic principle includes a housing, a gas sampling module, a paramagnetic oxygen sensor module, a signal processing module, a main control module, a power supply module, a communication module, and an alarm module.

[0006] The gas sampling module is used to collect gas samples and process gas samples. One end of the gas sampling module is a gas inlet connected to the detection environment, and the other end is a gas outlet connected to the paramagnetic oxygen sensor module.

[0007] The paramagnetic oxygen sensor module is used to detect the oxygen content in a gas sample, and includes a detection housing and a paramagnetic oxygen measurement component disposed inside the detection housing. The paramagnetic oxygen sensor module is electrically connected to the signal processing module.

[0008] The signal processing module is used to process the signal output by the paramagnetic oxygen sensor module, and includes a pre-signal amplification module, a signal filtering module, and an A / D conversion module.

[0009] The gas sampling module, paramagnetic oxygen sensor module, signal processing module, main control module, communication module, and alarm module are all electrically connected to the power supply module, and the paramagnetic oxygen sensor module, signal processing module, communication module, and alarm module are all electrically connected to the main control module.

[0010] By adopting the above structure, the gas sampling module, paramagnetic oxygen sensor module, signal processing module, main control module, power supply module, communication module and alarm module are integrated into a single housing, making the oxygen concentration detection alarm device compact and highly integrated. This results in a smaller size for easier installation. Furthermore, the paramagnetic oxygen sensor module enhances the detection accuracy and environmental adaptability of the oxygen concentration detection alarm device.

[0011] To ensure the stability of the gas sample temperature, the detection housing and the outer shell are detachably connected. The paramagnetic oxygen measurement assembly includes a sensor housing, in which a paramagnetic sensitive element is provided in the middle. The paramagnetic sensitive element is covered by a mounting shell. Inside the sensor housing, a first magnet is provided at one end of the paramagnetic sensitive element, and a second magnet is provided at the other end. The first magnet is covered with a first heating layer, a first heat insulation layer, and a first magnetic conductive layer from one end to the other, with the first magnetic conductive layer close to the mounting shell. The second magnet is covered with a second heating layer, a second heat insulation layer, and a second magnetic conductive layer from one end to the other, with the second magnetic conductive layer close to the mounting shell.

[0012] The sensor housing is provided with a sample inlet and a sample outlet. The paramagnetic sensitive element is provided with an air inlet channel and an air outlet channel at both ends. The air inlet channel passes through the first magnetic conductive layer, the first heat insulation layer and the first heating layer in sequence and is connected to the sample inlet. The air outlet channel passes through the second magnetic conductive layer, the second heat insulation layer and the second heating layer in sequence and is connected to the sample outlet.

[0013] To enable the paramagnetic sensing element to have higher detection sensitivity and better stability, the paramagnetic sensing element includes an annular gas chamber with a central channel in the middle. A first resistance wire and a second resistance wire are wound on the central channel. The first resistance wire and the second resistance wire form the two arms of a Wheatstone bridge. Magnetic blocks are provided on both the first magnetic layer and the second magnetic layer near the first resistance wire.

[0014] To enable the paramagnetic sensing element to have higher detection sensitivity and better stability, the annular gas chamber is an annular quartz glass gas chamber, the middle channel is a quartz glass channel, and the first heating layer and the second heating layer are both electric heating elements.

[0015] To enhance the anti-interference capability of the oxygen concentration detection alarm device, the pre-amplifier module amplifies the signal output from the paramagnetic oxygen sensor module, the signal filtering module filters the signal processed by the pre-amplifier module, and the A / D conversion module converts the filtered analog signal into a digital signal and sends it to the main control module.

[0016] To enhance the anti-interference capability of the oxygen concentration detection alarm device, a partition is provided inside the housing, dividing the internal space of the housing into a sensor compartment and a circuit board compartment. The paramagnetic oxygen sensor module is detachably installed in the sensor compartment, which contains a signal amplification circuit board. The pre-amplifier module is mounted on the signal amplification circuit board. The circuit board compartment contains a main circuit board, on which the signal filtering module, A / D conversion module, main control module, power supply module, and communication module are mounted.

[0017] To enhance the anti-interference capability of the oxygen concentration detection alarm device, an electromagnetic shielding layer is attached to the inner wall of the sensor compartment, and the signal amplification circuit board is connected to the main circuit board via a shielded wire.

[0018] To improve the reliability of the oxygen concentration detection alarm device, the alarm module includes a buzzer and an LED flashing light. The buzzer is mounted on the main circuit board, and the LED flashing light is mounted on the housing.

[0019] To ensure the cleanliness of the collected gas samples, the gas sampling module includes a pre-filter and a post-filter assembly. The pre-filter is used to collect gas samples and filter out dust and impurities in the gas samples. The post-filter assembly includes a post-filter, which is threadedly connected to a miniature diaphragm suction pump. The post-filter contains a carbon film layer and a desiccant layer.

[0020] Preferably, the housing is provided with an interface plug and a control panel.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The oxygen concentration detection and alarm device based on the paramagnetic principle provided by this invention has a compact structure, integrating a gas sampling module, a paramagnetic oxygen sensor module, a signal processing module, a main control module, a power supply module, a communication module, and an alarm module into a single housing, significantly reducing the size of the oxygen concentration detection and alarm device; the paramagnetic oxygen sensor module can be detachably installed in the sensor compartment, and when the paramagnetic oxygen sensor module ages, becomes contaminated, or malfunctions, only the paramagnetic oxygen sensor module needs to be replaced, making replacement convenient and simple, reducing maintenance time and labor costs.

[0023] 2. The oxygen concentration detection and alarm device based on the paramagnetic principle provided by this invention is equipped with a paramagnetic oxygen sensor module, which has high detection accuracy and strong environmental adaptability, meeting the monitoring needs of multiple scenarios; it is equipped with a partition, an electromagnetic shielding layer, and a shielding wire. The partition separates the sensor compartment from the circuit board compartment, preventing electromagnetic radiation generated by the main circuit board from interfering with the weak signal of the paramagnetic oxygen sensor module during operation; the electromagnetic shielding layer can block external electromagnetic interference from entering the sensor compartment, and the signal amplification circuit board is connected to the main circuit board through the shielding wire, avoiding external interference to the signal during transmission.

[0024] 3. The oxygen concentration detection and alarm device based on the paramagnetic principle provided by this invention is equipped with a gas sampling module for collecting and processing gas samples. The sampling cleanliness is high, ensuring the cleanliness of the gas sample entering the paramagnetic oxygen sensor module. This not only extends the service life of the paramagnetic sensitive element, but also avoids detection errors caused by gas sample contamination, ensuring the stability of long-term monitoring.

[0025] 4. The oxygen concentration detection and alarm device based on the paramagnetic principle provided by the present invention is equipped with an alarm module, which includes a buzzer and an LED flashing light. The dual warning avoids the problem of a single alarm method being ignored in complex environments. Moreover, the alarm module is directly linked with the main control module, and can instantly trigger an alarm when the oxygen concentration exceeds the set range. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0027] Figure 2 This is an exploded view of an embodiment of the present invention;

[0028] Figure 3 This is a side view of an embodiment of the present invention;

[0029] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0030] Figure 5 This is an exploded view of a paramagnetic oxygen sensor module;

[0031] Figure 6 This is an exploded view of the internal structure of the sensor housing;

[0032] Figure 7 This is a schematic diagram of the gas sampling module;

[0033] Figure 8 This is a control block diagram of an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the working principle of a paramagnetic oxygen sensor module.

[0035] Wherein: 1-Outer shell; 11-Separator; 12-Sensor compartment; 13-Circuit board compartment; 14-Interface plug; 15-Control panel; 2-Gas sampling module; 21-Pre-filter; 22-Post-filter assembly; 221-Carbon membrane layer; 222-Desiccant layer; 223-Miniature diaphragm intake pump; 3-Paramaroid oxygen sensor module; 31-Detection housing; 4-Paramaroid oxygen measurement assembly; 40-Sensor housing; 41-Sample inlet; 42-Sample outlet; 43-Parmagnetic sensitive element; 431-Air outlet channel; 432-Air inlet channel; 433-First resistance wire; 434-Second resistance wire; 44-Mounting shell; 45-Second magnet; 451-Second heating layer; 452-Second insulation layer; 453-Second magnetic conductive layer; 46-First magnet; 461-First heating layer; 462-First insulation layer; 463-First magnetic conductive layer; 47-5-Signal amplification circuit board; 6-Main circuit board; 7-LED flashing light. Detailed Implementation

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] The orientations mentioned in this specification are based on the orientation of the invention during normal operation, and do not limit the orientation during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0038] like Figure 1-9 As shown, an oxygen concentration detection and alarm device based on the paramagnetic principle includes a housing 1, a gas sampling module 2, a paramagnetic oxygen sensor module 3, a signal processing module, a main control module, a power supply module, a communication module, and an alarm module. The housing 1 is provided with an interface plug 14 and a control panel 15. The gas sampling module 2, the paramagnetic oxygen sensor module 3, the signal processing module, the main control module, the communication module, and the alarm module are all electrically connected to the power supply module, and the paramagnetic oxygen sensor module 3, the signal processing module, the communication module, and the alarm module are all electrically connected to the main control module.

[0039] The oxygen concentration detection alarm device provided in this embodiment of the invention integrates the gas sampling module 2, the paramagnetic oxygen sensor module 3, the signal processing module, the main control module, the power supply module, the communication module, and the alarm module onto a single housing 1. This results in a compact structure, high functional integration, and a smaller size for easier installation. Furthermore, the paramagnetic oxygen sensor module 3 enhances the detection accuracy and environmental adaptability of the oxygen concentration detection alarm device.

[0040] The paramagnetic oxygen sensor module 3 is used to detect the oxygen content in a gas sample. It includes a detection housing 31 and a paramagnetic oxygen measurement component 4 disposed inside the detection housing 31. The paramagnetic oxygen sensor module 3 is electrically connected to the signal processing module. It has high detection accuracy and strong environmental adaptability, meeting the monitoring needs of multiple scenarios. The detection housing 31 is detachably connected to the outer shell 1. The paramagnetic oxygen sensor module 3 can be detachably installed inside the outer shell 1. When the paramagnetic oxygen sensor module 3 ages, becomes contaminated, or malfunctions, only the paramagnetic oxygen sensor module 3 needs to be replaced. Replacement is convenient and simple, reducing maintenance time and labor costs.

[0041] The paramagnetic oxygen measuring assembly 4 includes a sensor housing 40, a paramagnetic sensing element 43 disposed in the center of the sensor housing 40, and a mounting shell 44 covering the paramagnetic sensing element 43. A first magnet 46 is disposed at one end of the paramagnetic sensing element 43 inside the sensor housing 40, and a second magnet 45 is disposed at the other end. The first magnet 46 is sequentially covered with a first heating layer 461, a first heat insulation layer 462, and a first magnetic conductive layer 463 from one end to the other, with the first magnetic conductive layer 463 close to the mounting shell 44. The second magnet 45 is sequentially covered with a second heating layer 451, a second heat insulation layer 452, and a second heat insulation layer 463 from one end to the other. The sensor housing 40 has a sample inlet 41 and a sample outlet 42. The paramagnetic sensing element 43 has an inlet channel 432 and an outlet channel 431 at both ends. The inlet channel 432 passes through the first magnetic layer 463, the first insulation layer 462 and the first heating layer 461 in sequence and is connected to the sample inlet 41. The outlet channel 431 passes through the second magnetic layer 453, the second insulation layer 452 and the second heating layer 451 in sequence and is connected to the sample outlet 42, thus ensuring the stability of the gas sample temperature.

[0042] The paramagnetic sensing element 43 includes an annular gas chamber with a central channel. A first resistance wire 433 and a second resistance wire 434 are wound around the central channel. The first resistance wire 433 and the second resistance wire 434 form the two arms of a Wheatstone bridge. The annular gas chamber is an annular quartz glass chamber, and the central channel is a quartz glass channel. Magnetic blocks 47 are provided on both the first magnetic layer 463 and the second magnetic layer 453. The two magnetic blocks 47 are positioned close to the first resistance wire 433. The first heating layer 461 and the second heating layer 451 are both electric heating elements, which makes the paramagnetic sensing element 43 have higher detection sensitivity and better stability.

[0043] like Figure 6 and Figure 9 As shown, the gas sample enters the annular gas chamber through the inlet channel 432 and flows along the two side channels of the annular gas chamber to the outlet channel 431. Oxygen is a paramagnetic gas. When there is no oxygen in the gas sample, there is no pressure difference between the two ends of the middle channel of the annular gas chamber, so no gas flows through the middle channel. The first resistance wire r1 and the second resistance wire r2 have no heat loss, so the first resistance wire r1 and the second resistance wire r2 maintain a certain resistance value due to the constant current flowing through them. However, when there is oxygen in the gas sample, due to the setting of the magnetic block 47, the magnetic field strength at the connection between the middle channel and the left channel of the annular gas chamber is the greatest. The oxygen in the left channel of the annular gas chamber is attracted by the magnetic field into the middle channel, forming thermomagnetic convection in the middle channel, and then enters the right channel of the annular gas chamber, and is discharged through the outlet channel 431.

[0044] Due to thermomagnetic convection, the oxygen flow passing through the first resistance wire r1 carries away some of its heat, resulting in heat loss in the first resistance wire r1. The oxygen flow passing through the second resistance wire r2 has already been heated and carries away almost no heat, so the second resistance wire r2 has almost no heat loss. This difference in temperature causes a difference in resistance between the first resistance wire r1 and the second resistance wire r2, leading to an imbalance in the Wheatstone bridge. Consequently, the paramagnetic oxygen measurement component 4 generates a signal. The higher the oxygen content in the gas sample, the greater the flow rate of thermomagnetic convection, the greater the difference in resistance between the first resistance wire r1 and the second resistance wire r2, and the stronger the signal output by the paramagnetic oxygen measurement component 4.

[0045] The gas sampling module 2 is used for collecting and processing gas samples. One end of the gas sampling module 2 is a gas inlet connected to the detection environment, and the other end is a gas outlet connected to the paramagnetic oxygen sensor module 3. It is used for collecting and processing gas samples. The sampling cleanliness is high, which ensures the cleanliness of the gas samples entering the paramagnetic oxygen sensor module 3. This not only extends the service life of the paramagnetic sensitive element 43, but also avoids detection errors caused by gas sample contamination, thus ensuring the stability of long-term monitoring.

[0046] The signal processing module processes the signal output from the paramagnetic oxygen sensor module 3. It includes a pre-amplifier module, a signal filter module, and an A / D converter module. The pre-amplifier module amplifies the signal output from the paramagnetic oxygen sensor module 3. The signal filter module filters the signal processed by the pre-amplifier module. The A / D converter module converts the filtered analog signal into a digital signal and sends it to the main control module. This enhances the anti-interference capability of the oxygen concentration detection alarm device.

[0047] The housing 1 has a partition 11 inside, which divides the internal space of the housing 1 into a sensor compartment 12 and a circuit board compartment 13. The paramagnetic oxygen sensor module 3 is detachably installed in the sensor compartment 12. The sensor compartment 12 has a signal amplification circuit board 5, and a pre-amplification module is installed on the signal amplification circuit board 5. The circuit board compartment 13 has a main circuit board 6, and a signal filtering module, an A / D conversion module, a main control module, a power supply module, and a communication module are installed on the main circuit board 6. The partition 11 separates the sensor compartment 12 from the circuit board compartment 13 to prevent the electromagnetic radiation generated by the main circuit board 6 from interfering with the weak signal of the paramagnetic oxygen sensor module 3 when it is working, and further makes the oxygen concentration detection alarm device have better anti-interference ability.

[0048] The inner wall of the sensor compartment 12 is fitted with an electromagnetic shielding layer. The signal amplification circuit board 5 and the main circuit board 6 are connected by a shielded wire, which makes the oxygen concentration detection alarm device have better anti-interference ability. The electromagnetic shielding layer can block external electromagnetic interference from entering the sensor compartment 12. The signal amplification circuit board 5 and the main circuit board 6 are connected by a shielded wire to avoid external interference during signal transmission.

[0049] The gas sampling module 2 is used to collect and process gas samples, including a pre-filter 21 and a post-filter assembly 22. The pre-filter 21 is used to collect gas samples and filter out dust and impurities in the gas samples. The post-filter assembly 22 includes a post-filter, which is threadedly connected to a miniature diaphragm suction pump 223. The post-filter contains a carbon film layer 221 and a desiccant layer 222. The gas samples collected by the gas sampling module 2 have high cleanliness, ensuring the cleanliness of the gas samples entering the paramagnetic oxygen sensor module 3. This not only extends the service life of the paramagnetic sensitive element 43, but also avoids detection errors caused by gas sample contamination, ensuring the stability of long-term monitoring.

[0050] The alarm module includes a buzzer and an LED flashing light 7. The buzzer is mounted on the main circuit board 6, and the LED flashing light 7 is mounted on the outer casing 1. The dual alarm mode avoids the problem of a single alarm mode being ignored in complex environments. Moreover, the alarm module is directly linked with the main control module. When the oxygen concentration exceeds the set range, the alarm can be triggered instantly, making the oxygen concentration detection alarm device have better alarm reliability.

[0051] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An oxygen concentration detecting alarm device based on the paramagnetic principle, characterized in that, It includes a housing (1), a gas sampling module (2), a paramagnetic oxygen sensor module (3), a signal processing module, a main control module, a power supply module, a communication module, and an alarm module; The gas sampling module (2) is used to collect gas samples and process gas samples. One end of the gas sampling module (2) is a gas inlet connected to the detection environment, and the other end is a gas outlet connected to the paramagnetic oxygen sensor module (3). The paramagnetic oxygen sensor module (3) is used to detect the oxygen content in a gas sample. It includes a detection housing (31) and a paramagnetic oxygen measurement component (4) disposed in the detection housing (31). The paramagnetic oxygen sensor module (3) is electrically connected to the signal processing module. The signal processing module is used to process the signal output by the paramagnetic oxygen sensor module (3), including a pre-amplifier module, a signal filter module and an A / D conversion module; The gas sampling module (2), the paramagnetic oxygen sensor module (3), the signal processing module, the main control module, the communication module, and the alarm module are all electrically connected to the power supply module. The paramagnetic oxygen sensor module (3), the signal processing module, the communication module, and the alarm module are all electrically connected to the main control module. The detection housing (31) is detachably connected to the outer shell (1). The paramagnetic oxygen measurement assembly (4) includes a sensor housing (40). A paramagnetic sensitive element (43) is provided in the middle of the sensor housing (40). The paramagnetic sensitive element (43) is covered by an mounting shell (44). A first magnet (46) is provided at one end of the paramagnetic sensitive element (43) and a second magnet (45) is provided at the other end. The first magnet (46) is covered with a first heating layer (461), a first heat insulation layer (462) and a first magnetic conductive layer (463) in sequence from one end to the other end. The first magnetic conductive layer (463) is close to the mounting shell (44). The second magnet (45) is covered with a second heating layer (451), a second heat insulation layer (452) and a second magnetic conductive layer (453) in sequence from one end to the other end. The second magnetic conductive layer (453) is close to the mounting shell (44). The sensor housing (40) is provided with a sample inlet (41) and a sample outlet (42). The paramagnetic sensing element (43) is provided with an air inlet channel (432) and an air outlet channel (431) at both ends. The air inlet channel (432) passes through the first magnetic conductive layer (463), the first heat insulation layer (462) and the first heating layer (461) in sequence and is connected to the sample inlet (41). The air outlet channel (431) passes through the second magnetic conductive layer (453), the second heat insulation layer (452) and the second heating layer (451) in sequence and is connected to the sample outlet (42). The paramagnetic sensing element (43) includes an annular gas chamber with a central channel in the middle. A first resistance wire (433) and a second resistance wire (434) are wound around the central channel. The first resistance wire (433) and the second resistance wire (434) form the two arms of a Wheatstone bridge. Magnetic blocks (47) are provided at positions near the first resistance wire (433) of both the first magnetic layer (463) and the second magnetic layer (453).

2. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 1, characterized in that, The annular air chamber is an annular quartz glass air chamber, the middle channel is a quartz glass channel, and the first heating layer (461) and the second heating layer (451) are both electric heating elements.

3. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 1, characterized in that, The pre-amplifier module is used to amplify the signal output by the paramagnetic oxygen sensor module (3). The signal filtering module filters the signal processed by the pre-amplifier module. The A / D conversion module converts the filtered analog signal into a digital signal and sends it to the main control module.

4. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 3, characterized in that, The outer shell (1) is provided with a partition (11), which divides the internal space of the outer shell (1) into a sensor compartment (12) and a circuit board compartment (13). The paramagnetic oxygen sensor module (3) is detachably installed in the sensor compartment (12). The sensor compartment (12) is provided with a signal amplification circuit board (5), and the pre-amplification module is set on the signal amplification circuit board (5). The circuit board compartment (13) is provided with a main circuit board (6), and the signal filtering module, A / D conversion module, main control module, power supply module and communication module are set on the main circuit board (6).

5. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 4, characterized in that, The inner wall of the sensor compartment (12) is fitted with an electromagnetic shielding layer. The paramagnetic oxygen sensor module (3) and the signal amplification circuit board (5), as well as the signal amplification circuit board (5) and the main circuit board (6), are connected by shielded wires.

6. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 4, characterized in that, The alarm module includes a buzzer and an LED flashing light (7). The buzzer is mounted on the main circuit board (6), and the LED flashing light (7) is mounted on the outer casing (1).

7. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 1, characterized in that, The gas sampling module (2) includes a pre-filter (21) and a post-filter assembly (22). The pre-filter (21) is used to collect gas samples and filter out dust and impurities in the gas samples. The post-filter assembly (22) includes a post-filter. The post-filter is threadedly connected to a micro diaphragm suction pump (223). The post-filter is provided with a carbon film layer (221) and a desiccant layer (222).

8. The oxygen concentration detection and alarm device based on the paramagnetic principle according to claim 1, characterized in that, The outer casing (1) is provided with an interface plug (14) and a control panel (15).

Images