CN109865440B - Standard gas preparation device - Google Patents
Standard gas preparation device Download PDFInfo
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- CN109865440B CN109865440B CN201910249099.1A CN201910249099A CN109865440B CN 109865440 B CN109865440 B CN 109865440B CN 201910249099 A CN201910249099 A CN 201910249099A CN 109865440 B CN109865440 B CN 109865440B
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- 239000007788 liquid Substances 0.000 claims description 49
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 4
- 210000004534 cecum Anatomy 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 119
- 239000002994 raw material Substances 0.000 description 23
- 238000003825 pressing Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007779 soft material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
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Abstract
The invention discloses a standard gas preparation device which comprises a gas distribution bottle, wherein a piston is arranged in the gas distribution bottle. The first air inlet of the gas distribution bottle is connected with the first gas bottle through a first gas conveying pipe, and the second air inlet of the gas distribution bottle is connected with the second gas bottle through a second gas conveying pipe. The first air port and the second air port are respectively provided with a first air bag and a second air bag. The first air delivery pipe is positioned on the air outlet side and the air inlet side of the first air bag and is respectively provided with a first valve and a second valve, and the first air port is provided with a third valve. And a fourth valve and a fifth valve are respectively arranged on the second air conveying pipe at the air outlet side and the air inlet side of the second air bag. The device not only can be as required nimble prepare the standard gas of certain volume, can guarantee moreover that the pressure of standard gas satisfies a standard atmospheric pressure.
Description
Technical Field
The invention relates to the technical field of detection experiment devices, in particular to a preparation device for preparing standard gas.
Background
At present, a direct sample injection-gas chromatography is used for detecting part of organic poisons in a workplace, and a series of standard gases are required to be prepared to prepare a standard curve.
The current devices for dispensing standard gases have a few problems:
first, due to the limitation of the volume of the container, only a certain volume of standard gas can be prepared, and the gas distribution volume cannot be flexibly controlled according to the requirement.
Second, the conventional dispensing device needs to inject bottom gas and raw material (liquid or gas) during dispensing, and the volumes of the bottom gas and the raw material need to be calculated according to the volume of the container before dispensing, which is complicated to operate and prone to error.
Thirdly, the pressure of the standard gas prepared by the traditional preparation device often cannot strictly meet one standard atmospheric pressure, so that the concentration is inaccurate when the standard gas is extracted, and the detection accuracy is influenced.
Disclosure of Invention
Aiming at the problems, the invention provides the standard gas preparation device which not only can flexibly prepare the standard gas with a certain volume according to the needs, has simple operation and is not easy to make mistakes, but also can ensure that the pressure of the standard gas meets a standard atmospheric pressure and the accuracy of a detection result.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a standard gas preparation device comprises a gas distribution bottle, wherein a piston is arranged in the gas distribution bottle, and a gas taking port and scales are arranged on the gas distribution bottle;
the first air inlet of the gas distribution bottle is connected with the first gas bottle through a first gas conveying pipe, and the second air inlet of the gas distribution bottle is connected with the second gas bottle through a second gas conveying pipe;
the first air pipe and the second air pipe are respectively provided with a first air port and a second air port, and the first air port and the second air port are respectively provided with a first air bag and a second air bag;
a first valve and a second valve are respectively arranged on the first gas transmission pipe at the gas outlet side and the gas inlet side of the first gas bag, and a third valve is arranged on the first gas port;
and a fourth valve and a fifth valve are respectively arranged on the second air conveying pipe at the air outlet side and the air inlet side of the second air bag.
Furthermore, the first air delivery pipe is provided with a gas-liquid conversion mechanism and a liquid inlet bottle communicated with the first air delivery pipe, and a piston is arranged in the liquid inlet bottle.
Further, the gas-liquid conversion mechanism including set up in be the deflector of U type on the first gas-supply pipe, first gas-supply pipe on lie in the deflector in be provided with the arc breach, the deflector in be provided with a sliding block, just the medial surface of sliding block with the arc breach coincide, the one end of sliding block is provided with the diameter and the same arc recess of first gas-supply pipe internal diameter, just the axis of arc recess is parallel with the axis of first gas-supply pipe.
Furthermore, the first gas transmission pipe on be provided with the feed liquor pipe, just the feed liquor pipe with the feed liquor bottle between be connected through the screw thread, the cecum of feed liquor bottle is provided with the liquid outlet, be provided with on the pipe wall of first gas transmission pipe with the corresponding inlet of liquid outlet.
Further, the axis of the arc-shaped notch is coplanar with the axis of the liquid outlet.
Furthermore, a push rod is arranged on the outer side face of the sliding block, and a long hole used for containing the push rod is formed in a web plate of the guide plate.
Further, second gas-supply pipe and distribution bottle between be provided with proportion conversion head, proportion conversion head include the gas collecting tank, one side of gas collecting tank is provided with the intake pipe, the opposite side of gas collecting tank is provided with a plurality of outlet ducts along the circumferencial direction equipartition, just the diameter more than or equal to the maximum diameter of outlet duct of intake pipe, the free end of outlet duct is provided with the clamp plate, the clamp plate on be provided with axis and outlet duct arrangement central axis coincident jack, distribution bottle on be provided with the jack to complex pivot, just the pivot arrives the distance of second air inlet equals the distance of jack to outlet duct, the free end of pivot is provided with the limiting plate, the pivot on be located between clamp plate and the limiting plate and the cover be equipped with the spring.
Furthermore, a sealing gasket is arranged on the pressure plate.
Furthermore, the pressure plate is provided with positioning holes corresponding to the air outlet pipes one to one, and the air distribution cylinder is provided with positioning bulges matched with the positioning holes.
The invention has the beneficial effects that:
1. the device is provided with the piston in the gas distribution bottle, and bottom gas and gaseous raw materials enter the gas distribution bottle according to a certain proportion when entering the gas distribution bottle, so that standard gas with a certain volume can be flexibly prepared according to needs without being limited by the volume of the gas distribution bottle.
2. The first air bag and the second air bag which are made of soft materials are respectively arranged on the first air conveying pipe and the second air conveying pipe, so that the air pressure of standard gas prepared in the gas distribution cylinder is guaranteed to be standard atmospheric pressure, and when the standard gas is extracted, the piston follows under the action of the external atmospheric pressure, the concentration of the extracted standard gas is guaranteed, and the accuracy of a detection result is guaranteed.
3. The device is suitable for both gas raw materials and liquid raw materials, and has strong practicability.
4. Through setting up the proportion conversion head, can control the proportion that gets into interior bottom gas of gas distribution bottle and gaseous raw materials to adapt to different gaseous raw materials, and the different needs of preparing the concentration of the same kind of gaseous raw materials.
5. When the liquid raw material is adopted to prepare the standard gas, the liquid raw material is injected into the gas preparation bottle through the Venturi effect, so that the uniformity of the finally obtained standard gas can be effectively ensured.
6. The operation is simple, and the work efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the present apparatus;
FIG. 2 is a schematic perspective view of the air distribution bottle at the inlet;
FIG. 3 is a first application state diagram (raw material is gas) of the device;
FIG. 4 is a sectional view A-A of FIG. 3;
FIG. 5 is an enlarged view of portion A of FIG. 4;
FIG. 6 is a diagram showing the second application state of the apparatus (the raw material is liquid);
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;
FIG. 8 is a cross-sectional view taken at C-C of FIG. 6;
FIG. 9 is an enlarged view of portion B of FIG. 8;
FIG. 10 is a schematic view showing the positional relationship between the guide plate and the first air delivery pipe;
FIG. 11 is a schematic perspective view of a slider;
FIG. 12 is a perspective view of the scale conversion head;
fig. 13 is a schematic perspective view of the inlet end of the air distribution bottle.
In the figure: 1-gas distribution bottle, 11-gas taking port, 12-first gas inlet, 13-second gas inlet, 14-rotating shaft, 141-limiting plate, 15-positioning projection, 2-first gas pipe, 21-first gas port, 211-third valve, 22-first gas bag, 23-first valve, 24-second valve, 25-liquid inlet pipe, 26-liquid inlet bottle, 261-liquid outlet, 27-gas-liquid switching mechanism, 271-guide plate, 2711-strip hole, 272-sliding block, 2721-push rod, 2722-arc groove, 3-first gas bottle, 4-second gas pipe, 41-second gas port, 42-second gas bag, 43-fourth valve, 44-fifth valve, 5-second gas bottle and 6-proportion switching head, 61-gas collecting box, 62-gas inlet pipe, 63-gas outlet pipe, 64-pressure plate, 641-jack, 642-positioning hole and 7-spring.
Detailed Description
As shown in fig. 1, a standard gas preparation device comprises a gas distribution bottle 1, a first gas transmission pipe 2, a first gas bottle 3, a second gas transmission pipe 4 and a second gas bottle 5, wherein a piston is arranged in the gas distribution bottle 1, and a gas taking port 11 and scales are arranged on the gas distribution bottle 1.
As shown in fig. 13, a first air inlet 12 and a second air inlet 13 are arranged at a blind end (air inlet end) of the air distribution bottle 1, the first air inlet 12 is connected with the first air bottle 3 through a first air transmission pipe 2, and the second air inlet 13 is connected with the second air bottle 5 through a second air transmission pipe 4.
As shown in FIG. 1, the first air delivery pipe 2 and the second air delivery pipe 4 are respectively provided with a first air port 21 and a second air port 41, and the first air port 21 and the second air port 41 are respectively provided with a first air bag 22 and a second air bag 42 which are made of soft materials.
As shown in fig. 1, the first air tube 2 is provided with a first valve 23 and a second valve 24 at the air outlet side and the air inlet side of the first air bag 22, respectively, and the first air port 21 is provided with a third valve 211. The second air delivery pipe 4 is provided with a fourth valve 43 and a fifth valve 44 on the air outlet side and the air inlet side of the second air bag 42 respectively. The first air delivery pipe 2 is provided with a gas-liquid conversion mechanism 27 and a liquid inlet bottle 26 communicated with the first air delivery pipe 2, wherein the gas-liquid conversion mechanism 27 is arranged between the first valve 23 and the air distribution bottle 1, and the liquid inlet bottle 26 is internally provided with a piston.
As a specific implementation manner, as shown in fig. 4 and 5, a liquid inlet pipe 25 is disposed on the first gas pipe 2, the liquid inlet pipe 25 is connected with the liquid inlet bottle 26 through a screw thread, a liquid outlet 261 is disposed at a blind end of the liquid inlet bottle 26, and a liquid inlet corresponding to the liquid outlet 261 is disposed on a pipe wall of the first gas pipe 2.
As shown in fig. 2, 10 and 11, the gas-liquid conversion mechanism 27 includes a U-shaped guide plate 271 disposed on the first gas pipe 2, and an opening of the guide plate 271 faces the first gas pipe 2. The first air delivery pipe 2 is arranged in the guide plate 271 and is provided with an arc notch with an axis parallel to the guide plate 271, and the axis of the arc notch is coplanar with the axis of the liquid outlet 261 of the liquid inlet bottle 26. A sliding block 272 is arranged in the guide plate 271, the inner side surface (the side surface close to the first air conveying pipe 2 is the inner side surface) of the sliding block 272 is an arc-shaped surface matched with the arc-shaped notch, and the outer side surface of the sliding block 272 is tightly attached to the web plate of the guide plate 271. One end of the sliding block 272 is provided with an arc-shaped groove 2722, the diameter of the arc-shaped groove 2722 is the same as the inner diameter of the first air delivery pipe 2, and the axis of the arc-shaped groove 2722 is parallel to the axis of the first air delivery pipe 2. A push rod 2721 is arranged on the outer side surface of the sliding block 272, and a long hole 2711 for accommodating the push rod 2721 is arranged on the web plate of the guide plate 271.
As shown in fig. 3 and 4, when the raw material is gas, the push rod 2721 is pushed to the lower end of the elongated hole 2711, and at this time, the axis of the arc-shaped groove 2722 at one end of the sliding block 272 coincides with the axis of the first gas pipe 2, so that a complete pipe with an unshielded inner wall is formed by the two.
As shown in fig. 6 and 7, when the raw material is liquid, the push rod 2721 is pushed to the upper end of the elongated hole 2711, and at this time, the other end of the sliding block 272 is located in the first gas pipe 2, and a throat is formed in the first gas pipe 2. When the air flow passes through the throat, negative pressure is formed at the throat, so that the raw material in the liquid inlet bottle 26 is sucked into the first air conveying pipe 2 and is injected into the gas distribution bottle 1 along with the bottom air.
Further, as for the gas raw material, when different standard gases are prepared, the raw material is different, and the ratio of the raw material to the bottom gas is different. In addition, when the concentrations of the standard gases to be prepared are different for the same raw material, the ratios of the raw material to the bottom gas are also different.
To solve this problem, for convenience of operation, as shown in fig. 2, a proportional switching head 6 is disposed between the second gas pipe 4 and the air distribution bottle 1.
As shown in fig. 12, the proportional switching head 6 includes a cylindrical gas collecting tank 61, and the gas collecting tank 61 is a hollow housing. An air inlet pipe 62 is arranged on one side of the air collection box 61, a plurality of air outlet pipes 63 with different diameters are arranged on the other side of the air collection box 61, and the diameter of the air inlet pipe 62 is larger than or equal to that of the air outlet pipe 63 with the largest diameter. The air inlet pipe 62 is hermetically connected with the second air delivery pipe 4, and a plurality of air outlet pipes 63 are uniformly distributed along the circumferential direction by taking the axis of the air collection box 61 as a central axis. The hanging end of the air outlet pipe 63 is provided with a pressing plate 64, preferably, the pressing plate 64 is circular, and the diameter of the pressing plate 64 is the same as that of the air collection box 61. The pressing plate 64 is provided with an insertion hole 641, and the axis of the insertion hole 641 coincides with the central axis of the arrangement of the plurality of air outlet pipes 63. As shown in fig. 13, the air distribution bottle 1 is provided with a rotating shaft 14 which is engaged with the insertion hole 641, and the distance from the rotating shaft 14 to the second air inlet 13 is equal to the distance from the insertion hole 641 to the air outlet 63. A limit plate 141 is arranged at the suspended end of the rotating shaft 14. As shown in fig. 6 and 8, the rotating shaft 14 is sleeved with a spring 7, one end of the spring 7 abuts against the pressing plate 64, and the other end of the spring 7 abuts against the limiting plate 141.
Further, in order to ensure the sealing performance, a sealing gasket is arranged on one side of the pressure plate 64 close to the gas distribution bottle 1.
Further, in order to ensure that the air outlet tube 63 is flush with the second air inlet 13 of the air distribution bottle 1 completely and avoid the occurrence of misalignment, as shown in fig. 9, 12 and 13, positioning holes 642 are formed in the pressure plate 64, the number of the positioning holes 642 is the same as that of the air outlet tube 63, and the positions of the positioning holes 642 correspond to those of the air outlet tube one by one, and positioning protrusions 15 matched with the positioning holes 642 are formed in the air distribution bottle 1.
As a specific implementation manner, the positioning holes 642 are disposed on the inner side of the air outlet tube 63 and are uniformly distributed along the circumferential direction with the central axis as the axis.
The operation process is as follows:
1. when the raw material is a gas
First, the connection between the air inlet pipe 62 and the second air inlet pipe 4 is disconnected, the proportion of the cross-sectional areas of the first air inlet pipe 2 and the air outlet pipe 63 is adjusted by rotating the proportion conversion head 6 as required, and then the air inlet pipe 62 and the second air outlet pipe 63 are connected.
Second, the gas-liquid conversion mechanism 27 is adjusted so that the slide block 272 is positioned as shown in fig. 3, i.e., in the lower position.
Thirdly, the first valve 23 and the fourth valve 43 are closed, the second valve 24, the third valve 211 and the fifth valve 44 are opened, and the first gas cylinder 3 and the second gas cylinder 5 respectively inflate the first gas bag 22 and the second gas bag 42 until the first gas bag 22 is nearly inflated but not inflated, so as to ensure that the gas pressure in the gas bags is one atmosphere.
Fourth, the second valve 24 and the fifth valve 44 are closed, the first valve 23 and the fourth valve 43 are opened, and the piston in the gas distribution bottle 1 is pulled.
Because the pipe diameters of the first gas pipe 2 and the gas outlet pipe 63 are set according to a certain proportion, and the pressure of the gas in the first gas bag 22 and the second gas bag 42 is equal and is one atmosphere, the proportion of the gas entering the gas distribution bottle 1 is certain, so that the standard gas with the required proportion is prepared and can be used at any time, and the prepared volume can be controlled at any time.
2. When the raw material is liquid
First, the liquid inlet bottle 26 is removed and a volume of liquid material is extracted and then screwed down onto the liquid inlet tube 25.
Second, the gas-liquid conversion mechanism 27 is adjusted so that the slide block 272 is positioned at the upper position as shown in fig. 7.
Thirdly, the third valve 211, the fourth valve 43 and the fifth valve 44 are closed, the first valve 23 and the second valve 24 are opened, and the gas in the first gas bottle 3 enters the gas distribution bottle 1 through the first gas transmission pipe 2. When the air current in the first air pipe 2 passes through the throat position, because the sectional area becomes small, negative pressure can be generated at the throat position, so that the liquid raw material in the liquid inlet bottle 26 is sucked into the first air pipe 2 and is sprayed into the gas distribution bottle 1 along with the air current. Until the liquid in the liquid inlet bottle 26 is completely pressed into the first air delivery pipe 2.
Fourth, first valve 23 is closed and third valve 211 is opened, and first gas cylinder 3 inflates first gas bag 22 until first gas bag 22 is nearly full, but not yet full.
Fifth, the gas-liquid conversion mechanism 27 is adjusted so that the slide block 272 is positioned as shown in fig. 3, i.e., in the lower position.
Sixth, the second valve 24 is closed, the first valve 23 is opened, and the piston in the dispensing bottle 1 is pulled until the desired volume is reached.
Claims (7)
1. A standard gas dispensing apparatus, comprising: the gas distribution cylinder is internally provided with a piston and is provided with a gas taking port and scales;
the first air inlet of the gas distribution bottle is connected with the first gas bottle through a first gas conveying pipe, and the second air inlet of the gas distribution bottle is connected with the second gas bottle through a second gas conveying pipe;
the first air pipe and the second air pipe are respectively provided with a first air port and a second air port, and the first air port and the second air port are respectively provided with a first air bag and a second air bag;
a first valve and a second valve are respectively arranged on the first gas transmission pipe at the gas outlet side and the gas inlet side of the first gas bag, and a third valve is arranged on the first gas port;
a fourth valve and a fifth valve are respectively arranged on the second gas transmission pipe at the gas outlet side and the gas inlet side of the second gas bag;
the first gas pipe is provided with a gas-liquid conversion mechanism and a liquid inlet bottle communicated with the first gas pipe, and a piston is arranged in the liquid inlet bottle;
the gas-liquid conversion mechanism comprises a guide plate which is U-shaped and is arranged on the first gas pipe, the first gas pipe is provided with an arc-shaped notch, a sliding block is arranged in the guide plate, the inner side surface of the sliding block is matched with the arc-shaped notch, one end of the sliding block is provided with an arc-shaped groove with the same diameter as the inner diameter of the first gas pipe, and the axis of the arc-shaped groove is parallel to the axis of the first gas pipe.
2. A standard gas dispensing apparatus as defined in claim 1 wherein: the first gas pipe on be provided with the feed liquor pipe, just the feed liquor pipe with the feed liquor bottle between be connected through the screw thread, the cecum of feed liquor bottle is provided with the liquid outlet, be provided with on the pipe wall of first gas pipe with the corresponding inlet of liquid outlet.
3. A standard gas dispensing apparatus as defined in claim 2 wherein: the axis of the arc-shaped notch is coplanar with the axis of the liquid outlet.
4. A standard gas dispensing apparatus as defined in claim 1 wherein: the outer side face of the sliding block is provided with a push rod, and a web plate of the guide plate is provided with a strip hole for containing the push rod.
5. A standard gas dispensing apparatus as defined in claim 1 wherein: second gas-supply pipe and distribution bottle between be provided with proportion conversion head, proportion conversion head include the gas collecting tank, one side of gas collecting tank is provided with the intake pipe, the opposite side of gas collecting tank is provided with a plurality of outlet ducts along the circumferencial direction equipartition, just the diameter more than or equal to the maximum diameter of outlet duct of intake pipe, the free end of outlet duct is provided with the clamp plate, the clamp plate on be provided with axis and outlet duct arrangement central axis coincident jack, the distribution bottle on be provided with the jack to complex pivot, just the pivot is arrived the distance of second air inlet equals the distance of jack to outlet duct, the free end of pivot is provided with the limiting plate, the pivot on be located and the cover is equipped with the spring between clamp plate and the limiting plate.
6. A standard gas dispensing apparatus as defined in claim 5 wherein: the pressure plate is provided with a sealing gasket.
7. A standard gas dispensing apparatus as defined in claim 5 wherein: the pressure plate is provided with positioning holes which are in one-to-one correspondence with the air outlet pipes, and the air distribution bottle is provided with positioning bulges matched with the positioning holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910249099.1A CN109865440B (en) | 2019-03-29 | 2019-03-29 | Standard gas preparation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910249099.1A CN109865440B (en) | 2019-03-29 | 2019-03-29 | Standard gas preparation device |
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| CN109865440A CN109865440A (en) | 2019-06-11 |
| CN109865440B true CN109865440B (en) | 2021-08-31 |
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| CN201910249099.1A Active CN109865440B (en) | 2019-03-29 | 2019-03-29 | Standard gas preparation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113049757B (en) * | 2021-03-31 | 2022-10-21 | 重庆文理学院 | Continuous piston type air distribution device for experiment |
| CN115127017B (en) * | 2022-06-30 | 2024-05-24 | 大连大特气体有限公司 | Standard gas split charging device and split charging method |
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| CN107677630A (en) * | 2017-09-22 | 2018-02-09 | 郑州东辰科技有限公司 | A kind of Tail gas measuring remote sensing instrument calibration method and calibrating installation |
| CN108970429A (en) * | 2018-06-15 | 2018-12-11 | 盛密科技(上海)有限公司 | A kind of air distributing device and air distributing method of low concentration calibrating gas |
| CN208612210U (en) * | 2018-06-15 | 2019-03-19 | 盛密科技(上海)有限公司 | A kind of low concentration standard gas preparation device |
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2019
- 2019-03-29 CN CN201910249099.1A patent/CN109865440B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2237874B (en) * | 1989-10-09 | 1993-08-25 | Johan David Raal | Preparation of standard gas mixtures |
| CN201333383Y (en) * | 2008-12-16 | 2009-10-28 | 南京特种气体厂有限公司 | Gas preparation device for preparing mixed gas including low-pressure liquid gas component |
| WO2014065233A1 (en) * | 2012-10-22 | 2014-05-01 | 大陽日酸株式会社 | Method and device for supplying hydrogen-selenide mixed gas |
| CN203329640U (en) * | 2013-06-27 | 2013-12-11 | 江苏物联网研究发展中心 | Standard gas mixing device for gas testing system |
| EP3098601A1 (en) * | 2015-05-26 | 2016-11-30 | Politechnika Gdanska | A system for producing reference gas mixtures, especially smell ones |
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| CN108970429A (en) * | 2018-06-15 | 2018-12-11 | 盛密科技(上海)有限公司 | A kind of air distributing device and air distributing method of low concentration calibrating gas |
| CN208612210U (en) * | 2018-06-15 | 2019-03-19 | 盛密科技(上海)有限公司 | A kind of low concentration standard gas preparation device |
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