CN113092798A - Automatic sample introduction device for gas detection - Google Patents
Automatic sample introduction device for gas detection Download PDFInfo
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- CN113092798A CN113092798A CN202110387765.5A CN202110387765A CN113092798A CN 113092798 A CN113092798 A CN 113092798A CN 202110387765 A CN202110387765 A CN 202110387765A CN 113092798 A CN113092798 A CN 113092798A
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- way valve
- gas detection
- tube
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 20
- 229930195733 hydrocarbon Natural products 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 10
- 239000012855 volatile organic compound Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/025—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations having a carousel or turntable for reaction cells or cuvettes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1004—Cleaning sample transfer devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an automatic sample introduction device for gas detection, which comprises a bottom supporting device, wherein a socket is arranged on the bottom supporting device, a pushing device is arranged above the socket, a telescopic device is arranged below the socket, a sample introduction needle is arranged on the telescopic device, the tail end of the sample introduction needle is connected with a gas guide tube, the upper surface of the bottom supporting device is movably connected with a sample turntable, a sample tube is detachably connected in the sample turntable, and a power device is connected on the sample turntable. The device can effectively solve the problems that the prior device cannot automatically sample, and the labor cost and the sampling cost are increased.
Description
Technical Field
The invention belongs to the technical field of sample injectors, and particularly relates to an automatic sample injection device for gas detection.
Background
The state office in 2018 issued "notice state of action plan for three years of defense war on printing and winning blue sky" (2018 # 22). The notice indicates that a VOCs special treatment scheme is to be implemented, VOCs are brought into an environmental protection tax range, and environmental air VOCs monitoring is carried out in various cities and other cities with serious ozone pollution in key areas. Strict environment law enforcement inspection is carried out, major area atmospheric pollution hotspot grid supervision is carried out, and environment law enforcement such as industrial furnace and kiln emission, industrial unorganized emission, VOCs pollution treatment and the like is enhanced. Wherein the VOCs adopt TVOC and non-methane total hydrocarbons as control indexes. The rapid and accurate monitoring of non-methane total hydrocarbons is crucial to VOCs pollution control and environmental law enforcement.
At the present stage, the non-methane total hydrocarbon monitoring adopts standard HJ 604-2017 direct sample injection-gas chromatography for measuring total hydrocarbons, methane and non-methane total hydrocarbons in the environment air and HJ 38-2017 gas chromatography for measuring total hydrocarbons, methane and non-methane total hydrocarbons in the fixed pollution source waste gas. The sampling mode is divided into an air bag and a needle cylinder. The air bag sampling has higher requirements on air tightness and adsorbability of the air bag, the air bag is easy to be polluted, the price of a single air bag is higher, generally 80 yuan/bag, and the air bag is easy to leak and lose air after being repeatedly used. The syringe is sampled conveniently and swiftly, and it is convenient easily to preserve the transportation, and the syringe is cheaper 30 yuan/piece, but the ageing is shorter. The whole analysis process adopts manual sample injection, double quantitative rings manual switching sample injection or automatic switching sample injection, and gas chromatography (FID) detection. The analysis process needs manual operation in the whole process, the labor cost is high, and meanwhile, due to the fact that manual sample introduction is not accurate enough for pressure control, analysis errors are likely to be large. In order to improve the working efficiency, save the labor cost and ensure the accuracy and timeliness of the sample, an automatic sample injector needs to be designed urgently to meet the market demand.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an automatic sample introduction device for gas detection, which can effectively solve the problems that the automatic sample introduction cannot be realized, the sample aging cannot be ensured and the analysis cost cannot be increased in the conventional device.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a gaseous automatic sampling device that detects, includes the bottom sprag device, is provided with the socket on the bottom sprag device, and the socket top is provided with thrust unit, and the socket below is provided with the telescoping device, is provided with the syringe on the telescoping device, and syringe tail end is connected with the air duct, and bottom sprag device upper surface swing joint has the sample carousel, can dismantle in the sample carousel and be connected with the sample cell, is connected with power device on the sample carousel.
In the scheme, the bottom supporting device comprises a bottom plate and supporting legs which are fixedly connected, a socket is arranged on the bottom plate and is circular, the diameter of the socket is larger than that of the sample injection needle, a telescopic device is fixedly connected with the supporting legs and is used for driving the sample injection needle to move up and down, a pushing device is used for pushing out non-methane total hydrocarbons in the sample tube, a power device is used for driving a sample turntable to rotate to realize continuous sampling, and the power device is fixedly connected with the bottom supporting device through a connecting rod; the pushing device, the telescopic device and the power device are respectively connected with a computer, work is controlled through a computer program, when the device is used, a sample tube is placed in the sample turntable, the power device is controlled to rotate, the sample turntable is further driven to rotate, the sample tube is positioned right above the socket, then the telescopic device is controlled to work, the sample injection needle is driven to move upwards, the sample injection needle is inserted into the sample tube, the pushing device is controlled to work according to a signal fed back by the EPC pressure control device, the pushing device is utilized to push and press a piston of the sample tube, gas in the sample tube enters the quantitative ring through the sample injection needle, and then the sample gas in the quantitative ring is brought into the detection device through switching of the six-way valve; and (3) resetting the pushing device and the telescopic device simultaneously in sample detection, switching the three-way valve, starting a back flushing mode, and cleaning a sample injection pipeline to prepare for next sample detection. And then, repeating the operation to finish the continuous sample introduction detection work of all samples.
The device's small in size can carry out autoinjection to a plurality of samples in succession, has reduced operator's work load when having improved detection efficiency.
Furthermore, a fixing rod is arranged on the side wall of the bottom supporting device, and the pushing device is arranged on the fixing rod and fixedly connected with the fixing rod.
In the above scheme, the dead lever sets up to the type of falling L, dead lever and bottom sprag device welded fastening, and bulldozes the device and pass through connecting piece fixed connection with the dead lever, makes through this design bulldoze the device and be in directly over the socket, conveniently bulldozes the sample cell.
Furthermore, the pushing device is a first air cylinder, the telescopic device is a second air cylinder, and the second air cylinder is fixedly connected with the sampling needle.
In the scheme, the free end of the telescopic rod of the first air cylinder is fixedly connected with a circular push plate for pushing and pressing the sample tube so as to improve the friction force between the sample tube and the sample tube; the sampling needle is fixedly connected with a telescopic rod of the second cylinder, and the sampling needle is driven to move up and down by the extension and contraction of the telescopic rod of the second cylinder; first cylinder and second cylinder are respectively through electrical control, and its shrink is more accurate with the distance of extension, improves the precision of advancing a kind.
Furthermore, the sample turntable is circular, a plurality of sample grades are arranged on the sample turntable, the sample grades are uniformly arranged on the edge of the sample turntable, and the sample tubes are arranged in the sample grades.
Further, the sample tube is in threaded connection or clamped connection with the sample site.
In the above scheme, the sample cell outer wall is provided with the external screw thread, and sample position inner wall is provided with the internal thread, and both accessible threaded connection, threaded connection back can be so that keep relatively fixed between sample cell and the sample position, and the thrust that makes progress that produces when preventing to advance the appearance needle and insert promotes the sample cell, influences the insertion effect.
Further, when the sample tube is clamped with the sample position, the lower portion of the inner wall of the sample position is provided with an annular clamping plate, the upper portion of the inner wall of the sample position is provided with a first arc-shaped clamping plate and a second arc-shaped clamping plate, and the side wall of the sample tube is provided with a third arc-shaped clamping plate.
In the above scheme, annular cardboard and sample position inner wall integrated into one piece, the inside diameter of annular cardboard is less than the diameter of sample cell, make the sample cell can not fall after putting into the appearance grade, set up from top to bottom arc cardboard one and arc cardboard two, all with sample position inner wall integrated into one piece, the interstitial distance between the two is the thickness of three more than or equal to arc cardboard, three and sample cell integrated into one piece of arc cardboard, put into the appearance grade with the sample cell after, rotate the sample cell, make three arc cardboard be in between arc cardboard one and the arc cardboard two, realize the fixed action to the sample cell, when avoiding inserting the appearance needle, cause the sample cell to remove.
Further, the bottom of the sample turntable is provided with a pulley, the upper surface of the bottom supporting device is provided with an annular sliding rail, and the pulley is arranged in the sliding rail.
In the above scheme, be provided with pulley and slide rail for the sample carousel can improve the pivoted precision for the stable rotation of bottom sprag device.
Furthermore, the power device is a stepping motor and is fixedly connected with the center of the sample turntable.
In the above scheme, the stepping motor is fixedly connected with the bottom supporting device through the connecting rod, the rotating shaft of the power device is fixedly connected with the sample turntable, and the sample turntable is driven to rotate through the power device, so that continuous automatic sample introduction is realized.
Furthermore, an EPC pressure control device and a quantitative ring are arranged on the air duct, and the free end of the air duct is connected with a gas phase detection device.
In the scheme, the EPC pressure control device is electrically connected with the computer and used for controlling the flow and the speed of sample injection.
Furthermore, a three-way valve and a six-way valve are arranged on the air guide pipe, the three-way valve is arranged below the sampling needle, an exhaust pipe is further connected onto the three-way valve, the six-way valve is arranged between the EPC pressure control device and the quantitative ring, and the six-way valve is further connected with a back blowing device.
In the above scheme, the three-way valve and the six-way valve are respectively electrically connected with the computer, after sample introduction of a sample in one sample tube is completed, the on-off states of the three-way valve and the six-way valve are controlled, so that a pipeline between the six-way valve and the quantitative ring is closed, a pipeline between the three-way valve and the sample introduction needle is closed, gases such as nitrogen and the like are blown into the gas guide tube by using the back blowing device, and the residual sample in the gas guide tube is blown out, so that the accuracy of next sample detection. Nitrogen gas that blows in through six-way valve blows off from the three-way valve along the air duct, and in order to avoid remaining total hydrocarbon of non-methane in the air duct to cause the influence to operating personnel's in the laboratory health, be provided with the air duct in three-way valve department, utilize the air duct to discharge the total hydrocarbon of remaining non-methane outdoor, the environmental protection security of improvement use.
The beneficial effects produced by the invention are as follows:
1. the device is provided with a plurality of sample grades for place the sample tube, can realize the automatic continuous sampling of a plurality of samples, liberation labour practices thrift the cost of labor, improves work efficiency.
2. The device automatically operates to ensure the timeliness of the sample and avoid the phenomenon of out-of-date data distortion.
3. The device is internally provided with an EPC pressure controller, so that the sampling volume can be accurately controlled by accurately controlling the pressure, and the data analysis accuracy is improved.
4. The device sets up the three-way valve, carries out the blowback through controlling the three-way valve switch and washs the pipeline, avoids advancing sample pipeline cross contamination, guarantees the accuracy of next sample.
5. The sampling pipe is cheap and durable, the cleaning is convenient, and the cost is saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the apparatus;
FIG. 3 is a schematic diagram of a top view of a sample site when a sample tube is clamped to the sample site;
FIG. 4 is a front cross-sectional view of a sample site when a sample tube is engaged with the sample site;
FIG. 5 is a schematic diagram of a top view of a sample tube when the sample tube is clamped to a sample site;
FIG. 6 is a top view of the bottom support assembly;
reference numerals: 1. a bottom support means; 2. a socket; 3. a pushing device; 4. a telescoping device; 5. a sample injection needle; 6. an air duct; 7. a sample turntable; 8. a sample tube; 9. a power plant; 10. fixing the rod; 11. sample grade; 12. an annular clamping plate; 13. an arc-shaped clamping plate I; 14. an arc-shaped clamping plate II; 15. an arc-shaped clamping plate III; 16. a slide rail; 17. an EPC pressure control device; 18. a dosing ring; 19. a three-way valve; 20. a six-way valve; 21. and (4) exhausting the gas.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 1-6, an automatic sample injection device for gas detection is provided, which includes a bottom support device 1, a socket 2 is disposed on the bottom support device 1, a pushing device 3 is disposed above the socket 2, optimally, a fixing rod 10 is disposed on a side wall of the bottom support device 1, and the pushing device 3 is disposed on the fixing rod 10 and fixedly connected with the fixing rod 10. Preferably, the pushing means 3 is a first cylinder.
A telescopic device 4 is arranged below the socket 2, a sample injection needle 5 is arranged on the telescopic device 4, and optimally, the telescopic device 4 is a second cylinder which is fixedly connected with the sample injection needle 5; the tail end of the sample injection needle 5 is connected with an air duct 6, an EPC pressure control device 17 and a quantitative ring 18 are optimally arranged on the air duct 6, and the free end of the air duct 6 is connected with a gas phase detection device. Optimally, the gas guide tube 6 is provided with a three-way valve 19 and a six-way valve 20, the three-way valve 19 is arranged below the sample injection needle 5, the three-way valve 19 is further connected with an exhaust pipe 21, the six-way valve 20 is arranged between the EPC pressure control device 17 and the quantitative ring 18, and the six-way valve 20 is further connected with a back flushing device.
The upper surface of the bottom supporting device 1 is movably connected with a sample turntable 7, optimally, the bottom of the sample turntable 7 is provided with a pulley, the upper surface of the bottom supporting device 1 is provided with an annular slide rail 16, and the pulley is arranged in the slide rail 16.
The sample turntable 7 is internally detachably connected with a sample tube 8, optimally, the sample turntable 7 is set to be circular, a plurality of sample grades 11 are arranged on the sample turntable 7, the sample grades 11 are uniformly arranged on the edge of the sample turntable 7, and the sample tube 8 is arranged in the sample grades 11. Preferably, the sample tube 8 is screwed or clamped to the sample site 11. Optimally, when the sample tube 8 is clamped with the sample position 11, the lower part of the inner wall of the sample position 11 is provided with the annular clamping plate 12, the upper part of the inner wall of the sample position 11 is provided with the first arc-shaped clamping plate 13 and the second arc-shaped clamping plate 14, and the side wall of the sample tube 8 is provided with the third arc-shaped clamping plate 15.
The sample turntable 7 is connected with a power device 9. Preferably, the power device 9 is a stepping motor, and the power device 9 is fixedly connected with the center of the sample turntable 7.
The use process of the device is as follows: placing a sample tube in a sample position on a sample turntable, fixing the sample tube and the sample position in a threaded or clamping manner, controlling a power device to rotate, further driving the sample turntable to rotate, enabling the sample tube to be positioned right above a socket, then controlling a telescopic device to work, driving a sample injection needle to move upwards, enabling the sample injection needle to be inserted into the sample tube, then controlling a pushing device to work, pushing a piston of the sample tube by using the pushing device, pushing gas in the sample tube out through the sample injection needle, entering a gas detection device through an air duct for detection, and controlling the flow and flow rate of the gas through an EPC pressure control device; after the gas in the sample tube is detected, the computer system controls the pushing device and the telescopic device to reset, then controls the power device to rotate, drives another sample tube to move right above the socket, controls the states of the three-way valve and the six-way valve simultaneously, closes a pipeline between the six-way valve and the quantitative ring, closes a pipeline between the three-way valve and the sample injection needle, blows in gas such as nitrogen and the like into the gas guide tube by using the back blowing device, blows out the residual sample in the gas guide tube, and improves the accuracy of next sample detection; and then, repeating the operation to finish the continuous sample introduction detection work of all samples.
Claims (10)
1. The utility model provides a gaseous automatic sampling device that detects, its characterized in that, includes bottom sprag device (1), be provided with socket (2) on bottom sprag device (1), socket (2) top is provided with thrust unit (3), socket (2) below is provided with telescoping device (4), be provided with on telescoping device (4) and advance appearance needle (5), advance appearance needle (5) trailing end connection and have air duct (6), bottom sprag device (1) upper surface swing joint has sample carousel (7), can dismantle in sample carousel (7) and be connected with sample tube (8), be connected with power device (9) on sample carousel (7).
2. The automatic sample introduction device for gas detection according to claim 1, wherein a fixing rod (10) is disposed on a side wall of the bottom support device (1), and the pushing device (3) is disposed on the fixing rod (10) and fixedly connected with the fixing rod (10).
3. The automatic sample introduction device for gas detection according to claim 1, wherein the pushing device (3) is a first cylinder, the telescopic device (4) is a second cylinder, and the second cylinder is fixedly connected with the sample introduction needle (5).
4. The automatic sample introduction device for gas detection according to claim 1, wherein the sample turntable (7) is configured to be circular, a plurality of sample grades (11) are arranged on the sample turntable (7), the sample grades (11) are uniformly arranged at the edge of the sample turntable (7), and the sample tubes (8) are arranged in the sample grades (11).
5. The gas detection automatic sample introduction device according to claim 4, wherein the sample tube (8) is in threaded connection or clamped connection with the sample stage (11).
6. The automatic sample introduction device for gas detection according to claim 5, wherein when the sample tube (8) is clamped with the sample stage (11), the annular clamping plate (12) is arranged at the lower part of the inner wall of the sample stage (11), the first arc-shaped clamping plate (13) and the second arc-shaped clamping plate (14) are arranged at the upper part of the inner wall of the sample stage (11), and the third arc-shaped clamping plate (15) is arranged on the side wall of the sample tube (8).
7. The automatic gas detection and sample introduction device according to claim 1, wherein a pulley is disposed at the bottom of the sample turntable (7), an annular slide rail (16) is disposed on the upper surface of the bottom support device (1), and the pulley is disposed in the slide rail (16).
8. The automatic gas detection and sample introduction device according to claim 1, wherein the power device (9) is a stepping motor, and the power device (9) is fixedly connected with the center of the sample turntable (7).
9. The automatic sample introduction device for gas detection according to claim 1, wherein the gas guide tube (6) is provided with an EPC pressure control device (17) and a quantitative ring (18), and the free end of the gas guide tube (6) is connected with a gas phase detection device.
10. The automatic sample introduction device for gas detection according to claim 9, wherein a three-way valve (19) and a six-way valve (20) are disposed on the gas guide tube (6), the three-way valve (19) is disposed below the sample injection needle (5), an exhaust tube (21) is further connected to the three-way valve (19), the six-way valve (20) is disposed between the EPC pressure control device (17) and the quantitative ring (18), and the six-way valve (20) is further connected to a back-blowing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387765.5A CN113092798A (en) | 2021-04-12 | 2021-04-12 | Automatic sample introduction device for gas detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387765.5A CN113092798A (en) | 2021-04-12 | 2021-04-12 | Automatic sample introduction device for gas detection |
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| CN113092798A true CN113092798A (en) | 2021-07-09 |
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| CN202110387765.5A Pending CN113092798A (en) | 2021-04-12 | 2021-04-12 | Automatic sample introduction device for gas detection |
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