Multi-parameter self-calibration sensor for monitoring SF6 / N2 gas by using tuning fork crystal oscillator technology

Abstract

The invention belongs to the technical field of sensors, particularly relates to a multi-parameter self-calibration sensor for monitoring SF6 / N2 gas by using a tuning fork crystal oscillator technology, and aims to solve the problem that the monitoring precision of the sensor is influenced due to the fact that dust and other impurities are attached to the surface of a sensitive element in the sensor when gas of an existing device directly enters the sensor. According to the scheme, the self-calibration sensor comprises a self-calibration sensor body, a mounting lug plate and an air inlet pipe; the gas sensor has the beneficial effects that the filter plate can effectively prevent impurities such as dust and particulate matters in gas from entering the sensor, and the situation that the monitoring precision of the sensor is reduced due to the fact that the impurities are attached to a sensitive element in the sensor is avoided, so that the service life of the sensor is prolonged, and the sensor can work in a relatively pure gas environment; parameters such as components, concentration, pressure, temperature and the like of target gas can be monitored more accurately, so that the stability of the performance of the sensor can be maintained, and reliable detection data can be output all the time.

Description

Technical Field

[0001] The invention relates to a self-calibration sensor, in particular to a multi-parameter self-calibration sensor for monitoring SF6 / N2 gas by using a tuning fork crystal oscillator technology, belonging to the technical field of sensors. Background Art

[0002] In many fields such as power systems, SF6 (sulfur hexafluoride) and N2 (nitrogen) mixed gases are widely used, for example, as insulating and arc-extinguishing media in gas-insulated electrical equipment. However, parameters such as the concentration, pressure and ambient temperature of these gases are crucial to the normal operation, performance and safety of the equipment. Therefore, sensors are often needed to monitor these parameters. Currently, the most widely used is the multi-parameter self-calibration sensor that monitors SF6 / N2 gas using tuning fork crystal oscillator technology. The working principle of this sensor is based on tuning fork crystal oscillator technology. Tuning fork crystal oscillator technology is a technology that uses the piezoelectric effect of tuning fork crystals to measure physical quantities. It can be used to monitor gas concentration, pressure, temperature and other parameters. When monitoring SF6 / N2 gas, the tuning fork crystal oscillator sensor can be used to measure the density, pressure and temperature of the gas.

[0003] In the prior art, a gas state multi-parameter detection sensor and its self-calibration method disclosed in announcement number CN116989855B, through the setting of a multi-parameter sensing mechanism, multiple parameters are detected in a test chamber, the operation is reliable and convenient for maintenance and replacement, in addition, through the closed chamber formed by the accommodation chamber in the calibration mechanism in the test chamber. The micro-water determination realizes the self-calibration function, thereby ensuring the accuracy of micro-water monitoring under long-term operation conditions and improving the measurement accuracy; the above-mentioned prior art solution has the following shortcomings: in the process of the above-mentioned device monitoring the gas, the gas directly enters the interior of the sensor, because the gas often contains impurities such as dust and particulate matter, these impurities will inevitably adhere to the surface of the sensor's sensitive element, and over time, the accumulation of impurities will gradually change the physical and chemical properties of the sensitive element, which directly leads to deviations in the sensor's response to the gas, thereby greatly reducing the monitoring accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology in order to solve the problem that the gas in the above-mentioned device directly enters the interior of the sensor, causing dust and other impurities to adhere to the surface of the sensitive element inside the sensor, thereby affecting the monitoring accuracy of the sensor.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: comprising a self-calibration sensor body, a mounting ear plate and an air intake pipe, wherein the mounting ear plate is fixedly connected to the four corners of the rear surface of the self-calibration sensor body, and the air intake pipe is fixedly connected to one side of the upper surface of the self-calibration sensor body; A filter box is fixedly connected to the surface of the air intake pipe, the filter box is connected to the air intake pipe, the inner surface of the filter box is provided with four limit slide grooves in a circular array, a limit slide is arranged inside each limit slide groove, the limit slide is slidably connected to the filter box, a mounting ring is fixedly connected between the four limit slides, the mounting ring is slidably installed inside the filter box through the limit slide, and the surface of the mounting ring is fixedly connected to the filter plate through fixing bolts.

[0006] As a further solution of the present invention: a T-shaped lifting rod is fixedly connected to the surface of the filter plate, and the installation position of the T-shaped lifting rod is located at the center position of the surface of the filter plate.

[0007] As a further solution of the present invention: an alarm is also fixedly connected to the shell surface of the self-calibration sensor body.

[0008] As a further scheme of the present invention: an arc-shaped fixing block is fixedly connected to one side of the inner wall surface of the filter box, a T-shaped sliding bar is inserted into a through hole opened in the surface of the arc-shaped fixing block, the T-shaped sliding bar and the arc-shaped fixing block are slidably connected, the top of the T-shaped sliding bar is fixedly connected to the lower surface of the mounting ring, a touch block is fixedly sleeved on the rod body of the T-shaped sliding bar, the installation position of the touch block is located at a position of the rod body of the T-shaped sliding bar close to the mounting ring, a first spring is installed between the touch block and the arc-shaped fixing block, the first spring is sleeved on the rod body of the T-shaped sliding bar, one end of the first spring is fixedly connected to the touch block, and the other end of the first spring is fixedly connected to the arc-shaped fixing block, a pressure sensor is also fixedly connected to the surface of the arc-shaped fixing block, the installation position of the pressure sensor is located directly below the touch block, and the pressure sensor is electrically connected to the alarm through a wire.

[0009] As a further solution of the present invention: the inner bottom surface of the filter box is fixedly connected to a support column in a circular array, the top of the support column is fixedly connected to a hollow ring plate, the upper surface and the inner side surface of the hollow ring plate are fixedly connected to a plurality of air nozzles in a circular array, the bottom surface of the hollow ring plate is fixedly connected to an air pipe, the air pipe is connected to the hollow ring plate, the end of the air pipe away from the hollow ring plate passes through the filter box and extends to the outside of the filter box, the end of the air pipe extending to the outside of the filter box is fixedly connected to a pressure gas tank, the pressure gas tank is connected to the air pipe, the pressure gas tank is fixedly connected to the self-calibration sensor body, and the upper surface and the inner side surface of the hollow ring plate have a plurality of air nozzles.

[0010] As a further solution of the present invention: the air nozzle is arranged in a trumpet shape.

[0011] As a further solution of the present invention: a solenoid valve is fixedly installed at the connecting position between the surface of the pressure gas tank and the gas transmission pipe.

[0012] As a further solution of the present invention: an inflation tube is fixedly connected to the surface of the pressure gas tank, the inflation tube is communicated with the pressure gas tank, and a sealing cap is threadedly connected to the surface of the inflation tube.

[0013] The beneficial effects of the present invention are: 1. The present invention uses a filter box, a mounting ring, a filter plate and other structures in combination. First, the filter plate can effectively block impurities such as dust and particles in the gas from entering the sensor, and prevent impurities from adhering to the sensitive elements inside the sensor, resulting in reduced sensor monitoring accuracy, thereby extending the service life of the sensor; Secondly, since the interference of impurities on the sensor is reduced, the sensor can work in a relatively pure gas environment and can more accurately monitor the composition, concentration, pressure, temperature and other parameters of the target gas, which helps to maintain the stability of the sensor performance and ensure that it always outputs reliable detection data; Furthermore, the presence of the filter plate keeps the quality of the gas entering the sensor stable to a certain extent. During the long-term gas detection process, the gas entering the sensor is purified by the filter plate each time, reducing the fluctuation of the detection data caused by different impurity contents, thereby enhancing the consistency and comparability of the detection results. 2. The present invention can automatically monitor the working status of the filter plate by using an arc-shaped fixed block, a T-shaped slide bar, a mounting ring, a touch block, a first spring, a pressure sensor, an alarm and other structures. When the dust on the surface of the filter plate accumulates to a certain extent, the pressure sensor can accurately sense and trigger the alarm to sound an alarm, which can promptly remind the staff to take cleaning measures before the dust accumulation has a serious impact on the filtering effect, thereby ensuring that the filtering efficiency of the filtering system is always maintained at a good level.

[0014] 3. The present invention can achieve all-round jetting of the filter plate by arranging a hollow ring plate, an air nozzle, an air pipe and a pressure gas tank. When dust accumulates, the gas ejected from the air nozzle can impact the dust on the surface of the filter plate from multiple angles, effectively removing dust accumulated at different positions of the filter plate, especially on key components such as the filter plate. Compared with jetting in a single direction, it can clean the dust more thoroughly, thereby effectively preventing dust from entering the interior of the sensor.

[0015] 4. The present invention sets the air nozzle in a trumpet shape, and the trumpet-shaped opening gradually expands. When the gas is ejected from the air nozzle, the airflow will diffuse to a wider area as the opening expands, which can expand the coverage of the jet and better jet clean the surface of the filter plate, ensuring that dust will not be concentrated in the local area not affected by the jet, thereby improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic cross-sectional structure diagram of the filter box and the pressure gas tank in the present invention; Figure 4 for Figure 3 The enlarged structural diagram at A in the middle; Figure 5 for Figure 3 The enlarged structural diagram at B in the middle; Figure 6 It is a schematic diagram of the connection structure of the mounting ring, the filter box and the filter plate in the present invention; Figure 7 It is a schematic diagram of the connection structure of the mounting ring, the arc-shaped fixing block and the T-shaped sliding rod in the present invention; Figure 8 for Figure 7 The enlarged structural diagram at C in the middle; Fig. 9 It is a schematic diagram of the connection structure between the hollow ring plate and the air nozzle in the present invention; Fig.10 It is a schematic diagram of the connection structure between the hollow ring plate and the gas transmission pipe in the present invention; In the figure: 1. Self-calibration sensor body; 2. Mounting ear plate; 3. Inlet pipe; 4. Filter box; 5. Limit slide groove; 6. Limit slider; 7. Mounting ring; 8. Filter plate; 9. Fixing bolt; 10. T-type lifting rod; 11. Hollow ring plate; 12. Jet nozzle; 13. Support column; 14. Air supply pipe; 15. Pressure gas tank; 16. Inflating pipe; 17. Rectangular slider; 18. Solenoid valve; 19. Arc fixing block; 20. Pressure sensor; 21. T-type slider; 22. Touch block; 23. First spring; 24. Alarm. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0018] like Figures 1 to 10As shown, a multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology includes a self-calibration sensor body 1, a mounting ear plate 2 and an intake pipe 3, wherein the mounting ear plate 2 is fixedly connected to the four corners of the rear surface of the self-calibration sensor body 1, and the intake pipe 3 is fixedly connected to one side of the upper surface of the self-calibration sensor body 1; A filter box 4 is fixedly connected to the surface of the air intake pipe 3, the filter box 4 is communicated with the air intake pipe 3, the inner surface of the filter box 4 is provided with four limit slide grooves 5 in a circular array, each limit slide groove 5 is provided with a limit slider 6 inside, the limit slider 6 and the filter box 4 are slidably connected, a mounting ring 7 is fixedly connected between the four limit sliders 6, the mounting ring 7 is slidably installed inside the filter box 4 through the limit slider 6, the surface of the mounting ring 7 is fixedly connected with a filter plate 8 by a fixing bolt 9, when in use, it can filter the gas entering the air intake pipe 3, to prevent dust and other impurities in the gas from entering the self-calibration sensor body 1 along with the gas, to avoid affecting the monitoring accuracy of the self-calibration sensor body 1.

[0019] Furthermore, a T-shaped lifting rod 10 is fixedly connected to the surface of the filter plate 8 , and the installation position of the T-shaped lifting rod 10 is located at the center of the surface of the filter plate 8 , so as to facilitate taking the filter plate 8 out of the filter box 4 . Example

[0020] Improvements based on Example 1: Furthermore, an alarm 24 is fixedly connected to the shell surface of the self-calibration sensor body 1. When a large amount of dust and other impurities accumulate on the surface of the filter plate 8, an alarm can be sounded through the alarm 24, thereby reminding the user on site to clean the dust and other impurities on the surface of the filter plate 8 in time.

[0021] Furthermore, an arc-shaped fixing block 19 is fixedly connected to one side of the inner wall surface of the filter box 4, a T-shaped slide bar 21 is inserted into the through hole opened on the surface of the arc-shaped fixing block 19, the T-shaped slide bar 21 and the arc-shaped fixing block 19 are slidably connected, the top of the T-shaped slide bar 21 is fixedly connected to the lower surface of the mounting ring 7, a touch block 22 is fixedly sleeved on the rod body of the T-shaped slide bar 21, the installation position of the touch block 22 is located at the position of the rod body of the T-shaped slide bar 21 close to the mounting ring 7, a first spring 23 is installed between the touch block 22 and the arc-shaped fixing block 19, the first spring 23 is sleeved on the rod body of the T-shaped slide bar 21, and one end of the first spring 23 is fixedly connected to the touch block 22 The other end of the first spring 23 is fixedly connected to the arc-shaped fixed block 19. The surface of the arc-shaped fixed block 19 is also fixedly connected with a pressure sensor 20. The installation position of the pressure sensor 20 is located directly below the touch block 22. The pressure sensor 20 is electrically connected to the alarm 24 through a wire, and can automatically monitor the working status of the filter plate 8. When the dust on the surface of the filter plate 8 accumulates to a certain extent, the pressure sensor 20 can accurately sense and trigger the alarm 24 to sound an alarm, which can promptly remind the staff to take cleaning measures before the dust accumulation has a serious impact on the filtering effect, thereby ensuring that the filtering efficiency of the filtering system is always maintained at a good level. Example

[0022] Improvements based on Example 1: Furthermore, the inner bottom surface of the filter box 4 is fixedly connected to a support column 13 in a circular array, and the top of the support column 13 is fixedly connected to a hollow ring plate 11. The upper surface and the inner side surface of the hollow ring plate 11 are fixedly connected to a plurality of air nozzles 12 in a circular array. The bottom surface of the hollow ring plate 11 is fixedly connected to an air supply pipe 14, and the air supply pipe 14 is connected to the hollow ring plate 11. One end of the air supply pipe 14 away from the hollow ring plate 11 passes through the filter box 4 and extends to the outside of the filter box 4. The end of the air supply pipe 14 extending to the outside of the filter box 4 is fixedly connected to a pressure The gas tank 15, the pressure gas tank 15 and the gas pipe 14 are connected, the pressure gas tank 15 and the self-calibration sensor body 1 are fixedly connected, and the upper surface and the inner side of the hollow ring plate 11 are provided with multiple air nozzles 12. This design can realize all-round air jetting inside the filter box 4. When dust accumulates, the gas ejected from the air nozzles 12 can impact the dust on the surface of the filter plate 8 from multiple angles, effectively removing the dust accumulated at different positions inside the filter box 4, especially on key components such as the filter plate 8. Compared with single-direction air jetting, the dust can be cleaned more thoroughly.

[0023] Furthermore, the air nozzle 12 is configured to be in a trumpet shape, and the trumpet-shaped opening gradually expands. When gas is ejected from the air nozzle 12, the airflow will diffuse to a wider area as the opening expands. This can expand the coverage of the jet and better jet clean the surface of the filter plate 8, ensuring that dust will not be concentrated in local areas not affected by the jet, thereby improving the cleaning efficiency.

[0024] Furthermore, a solenoid valve 18 is fixedly installed at the communication position between the surface of the pressure gas tank 15 and the gas delivery pipe 14 to control the inflow and outflow of the high-pressure gas in the pressure gas tank 15 .

[0025] Furthermore, an inflation tube 16 is fixedly connected to the surface of the pressure gas tank 15, and the inflation tube 16 is communicated with the pressure gas tank 15. A sealing cap 17 is threadedly connected to the surface of the inflation tube 16. The inflation tube 16 can be used to replenish gas into the pressure gas tank 15, so that the pressure gas tank 15 can maintain sufficient air pressure, ensuring that each jet cleaning operation can have an airflow of sufficient strength ejected from the air nozzle 12, thereby ensuring a stable and efficient cleaning effect.

[0026] Working principle: When in use, the gas enters the self-calibration sensor body 1 through the air inlet pipe 3, and first passes through the filter box 4. The mounting ring 7 in the filter box 4 can slide in the limiting slide groove 5 through the limiting slider 6. The filter plate 8 fixed on the mounting ring 7 intercepts and filters the dust and other impurities in the gas. As the use time increases, more and more dust will accumulate on the surface of the filter plate 8. At this time, under the combined action of the gravity of dust and other impurities, the filter plate 8 will move downward in the filter box 4. The downward movement of the filter plate 8 can then drive the mounting ring 7 to slide in the limiting slide groove 5 through the limiting slider 6. The filter plate 8 effectively blocks the dust, particulate matter and other impurities in the gas from entering the self-calibration sensor body 1, and prevents impurities from adhering to the sensitive element and changing its characteristics, thereby ensuring that the sensor can monitor various parameters of SF6 / N2 gas, such as concentration, pressure, temperature, etc., for a long time, stably and accurately, and ensures the reliability and accuracy of the detection data, which is crucial for fields such as power systems that have extremely high requirements for gas monitoring accuracy, and can effectively prevent equipment failures and safety hazards caused by monitoring errors; During this process, the mounting ring 7 slides and then drives the T-shaped slide bar 21 to move downward on the surface of the arc-shaped fixed block 19. The T-shaped slide bar 21 moves downward and then drives the touch block 22 to move downward. At this time, the first spring 23 can be squeezed by the touch block 22 until the touch block 22 contacts the pressure sensor 20. At this time, the pressure sensor 20 can sense the pressure and send the pressure signal to the controller alarm 24 to sound an alarm, which can timely remind the staff to take cleaning measures before the dust accumulation has a serious impact on the filtering effect, so as to ensure that the filtering efficiency of the filtering system is always maintained at a good level. When the alarm 24 sounds an alarm, the staff on site can control the solenoid valve 18 to open by using the control button. At this time, the high-pressure gas in the pressure gas tank 15 is transported to the hollow ring plate 11 through the gas pipe 14. The multiple trumpet-shaped air nozzles 12 on the upper surface and inner side of the hollow ring plate 11 spray all-roundly into the filter box 4. When the gas is sprayed from the trumpet-shaped air nozzles 12, the opening gradually expands, the air flow diffuses, and the jet coverage is expanded, which can effectively impact the dust on the surface of the filter plate 8 and realize the cleaning function. At the same time, the inflation pipe 16 on the pressure gas tank 15 can be used to supplement the gas, and the sealing cap 17 on its surface can ensure the sealing when it is not inflated; When the filter plate 8 needs to be replaced or cleaned, the fastening bolts 9 can be removed, and the filter plate 8 can be taken out of the filter box 4 by pulling the T-shaped lifting rod 10 at the center of the surface of the filter plate 8, which is convenient to operate.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology, comprising a self-calibration sensor body (1), a mounting ear plate (2) and an intake pipe (3), characterized in that: The mounting ear plates (2) are fixedly connected to the four corners of the rear surface of the self-calibration sensor body (1), and the air intake pipe (3) is fixedly connected to one side of the upper surface of the self-calibration sensor body (1); A filter box (4) is fixedly connected to the surface of the air intake pipe (3), the filter box (4) and the air intake pipe (3) are connected, the inner surface of the filter box (4) is provided with four limiting slide grooves (5) in a circular array, each limiting slide groove (5) is provided with a limiting slider (6) inside, the limiting slider (6) and the filter box (4) are slidably connected, a mounting ring (7) is fixedly connected between the four limiting sliders (6), the mounting ring (7) is slidably mounted inside the filter box (4) through the limiting slider (6), and the surface of the mounting ring (7) is fixedly connected to a filter plate (8) through a fixing bolt (9).

2. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 1 is characterized in that: A T-shaped lifting rod (10) is fixedly connected to the surface of the filter plate (8), and the installation position of the T-shaped lifting rod (10) is located at the center position of the surface of the filter plate (8).

3. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 1 is characterized in that: An alarm (24) is also fixedly connected to the shell surface of the self-calibration sensor body (1).

4. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 3 is characterized in that: An arc-shaped fixing block (19) is fixedly connected to one side of the inner wall surface of the filter box (4); a T-shaped sliding rod (21) is inserted into a through hole formed on the surface of the arc-shaped fixing block (19); the T-shaped sliding rod (21) and the arc-shaped fixing block (19) are slidably connected; the top of the T-shaped sliding rod (21) is fixedly connected to the lower surface of the mounting ring (7); a touch block (22) is fixedly sleeved on the body of the T-shaped sliding rod (21); the installation position of the touch block (22) is located at a position of the body of the T-shaped sliding rod (21) close to the mounting ring (7); the touch block (22) and A first spring (23) is installed between the arc-shaped fixed blocks (19), the first spring (23) is sleeved on the rod body of the T-shaped sliding rod (21), one end of the first spring (23) is fixedly connected to the touch block (22), and the other end of the first spring (23) is fixedly connected to the arc-shaped fixed block (19), and a pressure sensor (20) is also fixedly connected to the surface of the arc-shaped fixed block (19), the installation position of the pressure sensor (20) is located directly below the touch block (22), and the pressure sensor (20) is electrically connected to the alarm (24) through a wire.

5. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 4 is characterized in that: The inner bottom surface of the filter box (4) is fixedly connected to a support column (13) in a circular array, the top of the support column (13) is fixedly connected to a hollow ring plate (11), the upper surface and inner side surface of the hollow ring plate (11) are fixedly connected to a plurality of air nozzles (12) in a circular array, the bottom surface of the hollow ring plate (11) is fixedly connected to an air supply pipe (14), the air supply pipe (14) and the hollow ring plate (11) are connected, one end of the air supply pipe (14) away from the hollow ring plate (11) passes through the filter box (4) and extends to the outside of the filter box (4), the end of the air supply pipe (14) extending to the outside of the filter box (4) is fixedly connected to a pressure gas tank (15), the pressure gas tank (15) and the air supply pipe (14) are connected, the pressure gas tank (15) and the self-calibration sensor body (1) are fixedly connected, and the upper surface and inner side surface of the hollow ring plate 11 have a plurality of air nozzles 12.

6. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 5 is characterized in that: The air nozzle (12) is configured to be trumpet-shaped.

7. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 5, characterized in that: A solenoid valve (18) is also fixedly mounted at a position of communication between the surface of the pressure gas tank (15) and the gas delivery pipe (14).

8. The multi-parameter self-calibration sensor for monitoring SF6 / N2 gas using tuning fork crystal oscillator technology according to claim 7, characterized in that: The surface of the pressure gas tank (15) is also fixedly connected to an air filling tube (16), the air filling tube (16) and the pressure gas tank (15) are in communication, and the surface of the air filling tube (16) is threadedly connected to a sealing cap (17).

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