CN113970619A - Gas analysis device and sampling analysis method thereof - Google Patents
Gas analysis device and sampling analysis method thereof Download PDFInfo
- Publication number
- CN113970619A CN113970619A CN202010723644.9A CN202010723644A CN113970619A CN 113970619 A CN113970619 A CN 113970619A CN 202010723644 A CN202010723644 A CN 202010723644A CN 113970619 A CN113970619 A CN 113970619A
- Authority
- CN
- China
- Prior art keywords
- gas
- valve
- pressure
- switching valve
- path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004868 gas analysis Methods 0.000 title claims abstract description 41
- 238000004458 analytical method Methods 0.000 title claims abstract description 24
- 238000005070 sampling Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 122
- 238000001914 filtration Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The application discloses a gas analysis device and a sampling analysis method thereof; wherein the gas analysis device comprises: the device comprises a pressure reducing unit, a switching valve, an analyzer and a storage tank; when the gas analysis device is used for analyzing gas, the gas analysis device can automatically analyze the gas only by communicating the gas to be detected with the first gas path, and the use is simple and convenient.
Description
Technical Field
The invention relates to the field of gas measurement and analysis instruments, in particular to a gas analysis device and a sampling analysis method thereof.
Background
Before filling liquid gas, the tank car for loading liquid gas such as liquid argon, liquid nitrogen and the like needs to measure the content of components, such as oxygen, in the tank car, which affect the quality of a loaded product. In the past, measurement can be realized only by manually carrying out various complex operations; if the operation is improper, the measurement is inaccurate, the measuring instrument is damaged, and even a safety accident is caused.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a gas analysis apparatus and a method for sampling and analyzing the same.
In a first aspect, the present application discloses a gas analysis apparatus comprising: the device comprises a pressure reducing unit, a switching valve, an analyzer and a storage tank;
the pressure reducing unit comprises a first air path, the first air path is used for communicating an air source to be detected and the switching valve, and a pressure reducing valve is arranged on the first air path;
the switching valve comprises a first input port communicated with the storage tank, a second input port communicated with the first air path and an output port communicated with the analyzer; the switching valve can be selectively switched to enable the output port to be communicated with the first input port or the second input port.
Specifically, the gas analysis device that this application discloses when gas analysis, only need with the gas that needs detected with first gas circuit UNICOM, gas analysis device just can be automatic analyzes gas, and convenience simple to use, and can switch the diverter valve automatically after accomplishing gas analysis, make analysis appearance and storage tank intercommunication, the storage tank is the protective gas that has, and the protective gas in the accessible storage tank protects the analysis appearance, makes the analysis appearance not polluted by the foreign gas in the air, guarantees gas analysis device analysis gas's reliability.
In a second aspect, the present application also discloses a sampling analysis method using the gas analysis apparatus described above, comprising the steps of:
s1, enabling the gas to be detected to enter the first gas path, and reducing the pressure of the gas through the pressure reducing valve;
s2, the switching valve is switched to the analyzer to be communicated with the first air path, and after the analyzer is communicated with one air path for a preset time, the switching valve is switched to the analyzer to be communicated with the storage tank.
Advantageous effects
The application discloses gas analysis device includes: the device comprises a pressure reducing unit, a switching valve, an analyzer and a storage tank; the pressure reducing unit comprises a first air path, the first air path is used for communicating an air source to be detected and the switching valve, and a pressure reducing valve is arranged on the first air path; the switching valve comprises a first input port communicated with the storage tank, a second input port communicated with the first air path and an output port communicated with the analyzer; the switching valve can be selectively switched to enable the output port to be communicated with the first input port or the second input port; when the gas analysis device analyzes gas, the gas analysis device can automatically analyze the gas only by communicating the gas to be detected with the first gas path, and the use is simple and convenient.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of an embodiment of a gas analysis apparatus according to the present application;
FIG. 2 is a schematic structural diagram of a gas analysis device according to the present application in analyzing a tank car gas;
fig. 3 is a flow chart of gas sampling and analyzing by the gas analyzer of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, in a first aspect, the present application discloses a gas analysis device, which can be applied to analysis of liquefied gas in a tank body such as a tank car, and can also be used for gas analysis of a gas device, and can analyze high-pressure gas;
specifically, the gas analysis device includes: a pressure reducing unit 200, a switching valve 14, an analyzer 5, and a storage tank 23;
the pressure reducing unit 200 comprises a first air passage 100, the first air passage 100 is used for communicating an air source to be detected with the switching valve 14, and the first air passage 100 is provided with a pressure reducing valve 10;
the switching valve 14 includes a first input port (not shown in the figure) communicating with the reservoir 23, a second input port (not shown in the figure) communicating with the first gas passage 100, and an output port communicating with the analyzer 5; the switching valve 14 can be selectively switched to connect the output port with the first input port or the second input port.
Specifically, referring to fig. 2, in order to schematically illustrate the sampling and analysis of the gas in the tank car by using the gas analysis apparatus provided in the present application, it should be noted that the switching valve 14 is in an initial state of communicating the first input port and the output port, that is, the storage tank 15 is in a state of communicating with the analyzer 5, and the analyzer 5 is protected by the gas in the storage tank 23; firstly, the first gas path 100 is communicated with the gas output end of the tank car 22, for convenience of use, a first hose 2 may be arranged at a gas inlet of the first gas path 100, the first hose 2 is communicated with the gas output end of the tank car 22, then the tank car sampling valve 6 is opened, so that the gas in the tank car is input into the first gas path 100, at this time, the switching valve 14 is switched to make the second input port communicated with the output port, so as to communicate the analyzer 5 and the first gas path 100, so that the analyzer 5 analyzes the gas, and after the preset time t1, the switching valve 4 is switched to make the analyzer 5 communicated with the storage tank 23, so that the gas in the storage tank 23 continuously protects the analyzer 5.
Further, referring to fig. 1, the gas analysis apparatus further includes a control device 4 and a pressure detection device 9 disposed on the first gas path 100, wherein the gas is depressurized through a depressurization valve 10; when the input value is in the first gas path, the gas pressure in the first gas path 100 rises, the pressure detection device 9 detects the rise of the pressure and transmits the relevant signal to the control device 4, the control device 4 controls the switching valve 14 to switch according to the received signal, so that the second input port is communicated with the output port, the gas can be transmitted to the analyzer 5, and the analyzer 5 analyzes the gas; the control device 5 may be configured such that after the control switching valve 14 maintains the state where the second input port is communicated with the output port for a certain time t1, the control switching valve 14 is switched to a state where the first input port is communicated with the output port, so that the storage tank 23 is communicated with the analyzer 5, and the gas in the storage tank 23 continuously protects the analyzer 5; the time t1 is set to be appropriately longer than the time required for the analyzer 5 to analyze the gas, so that the switching valve 14 is switched after the analyzer 5 completes the analysis of the gas.
Further, a discharge air path 21 is provided in the first air path 100, and the discharge air path 21 is provided between the relief valve 10 and the switching valve 14.
Specifically, by providing the discharge gas path 21 between the pressure release valve 10 and the switching valve 14, the original gas in the first gas path 100 can be discharged through the discharge gas path 21 during gas analysis, so that the purity of the gas delivered to the analyzer 5 is ensured, and the measurement accuracy and reliability of the gas analysis apparatus are ensured.
Further, referring to fig. 1 and 2, the discharge air passage 21 is communicated with a control valve 12, and the control valve 12 is electrically connected with the control device 4.
Specifically, the control valve 12 is arranged on the discharge gas path 21, the control valve 12 is electrically connected with the control device 4, and the on-off of the control valve 12 is controlled by the control device 4, so that the work of the automatic control discharge gas path is realized, the automatic operation of the gas analysis device is realized, and the control valve 12 can adopt an electromagnetic valve.
The specific work is as follows: when the gas analyzer analyzes gas, gas is input from the first gas path 100 to increase the gas pressure in the first gas path 100, the gas pressure detecting device 9 detects the increase of the gas pressure and transmits a signal to the control device 4, the control device 4 controls the control valve 12 to open to release the gas in the first gas path 100, the gas flows from the first gas path 100 to the switching valve 14 to push the original gas in the first gas path 100 to be discharged through the release gas path 21, here, the control device 4 can set the opening time t2 of the control valve 12, after the control valve is opened for t2, the control device 4 controls the control valve 12 to close, and at the same time, the switching valve 14 is controlled to switch from the state of the first input port communicating with the output port to the state of the second input port communicating with the output port, so that the gas can flow to the analyzer 5.
Further, the gas analysis device further comprises a flow limiting valve 13, and the flow limiting valve 13 and the control valve 12 are sequentially connected to the discharge gas path 21.
Specifically, the flow limiting valve 13 is arranged on the discharge air path 21, so that flow limitation can be performed when the discharge air path 21 discharges air flow, and the pressure reducing valve 9 is prevented from being damaged due to the fact that the flow speed of the discharge air flow is too high.
Further, the pressure detection device 9 is provided at the front end of the pressure reducing valve 10.
Specifically, since the on-off of the control valve 12 is controlled by the control device 4 according to the pressure signal received from the pressure detection device 9, that is, when the gas to be detected is input into the first gas path 100, the pressure in the first gas path 100 rises, the pressure detection device 9 detects the pressure rise, and the control device 5 controls the control valve 12 to open to release the original gas in the first gas path 100, it can be understood that, if the gas pressure detection device 9 is disposed at a position close to the switching valve 14, when the gas pressure detection device 9 detects the signal of the pressure change, the gas flow of the gas to be detected may already compress the original gas in the first gas path 100 to a position close to the switching valve 14, which is not favorable for releasing the original gas in the first gas path 100; the pressure detection device 9 is arranged at the front end of the pressure reducing valve 10, so that the pressure detection device 9 can detect the pressure change in advance, the control valve 12 can be opened in time, the original gas in the first gas path 100 can be discharged more thoroughly, and the detection effect of the gas detection device is further improved; it can be understood that the position where the discharge air path 21 is communicated with the first air path 100 may be set to a position close to the switching valve, which is also helpful to completely release the original air in the first air path 100; the pressure detection device 9 can be a pressure sensor or a pressure transmitter, preferably a pressure transmitter.
Further, a relief valve 11 is provided in the first gas passage 100, and the relief valve 11 is provided between the pressure reducing valve 10 and the switching valve 14.
Specifically, through setting up relief valve 11 at the rear of relief pressure valve 10, when relief pressure valve 10 breaks down and can not reduce the gaseous await measuring of inputing first gas circuit 100, relief pressure valve 10 ground rear pressure can be higher, can trigger the relief valve at this moment and release the gaseous in first gas circuit 100, protects analysis appearance 5, has avoided leading to the analysis appearance to damage because of atmospheric pressure is too high.
Further, the decompression unit 200 further comprises a heating device 20 for heating the measured gas in the first gas path 100;
specifically, the gas is heated by the heating device, so that each device arranged on the gas analysis device is protected.
As a preferred embodiment, the pressure relief unit 200 is a valve island, the first air path 100 is arranged in the valve island, the pressure relief valve 10, the control valve 12, the flow limiting valve 13, the safety valve 11, the switching valve 14 and the pressure detection device 9 can be arranged on the valve island through an air vent arranged on the valve island, and the pressure relief unit 200 is arranged on the valve island to improve the integration level, reduce the volume of the gas analysis device and reduce the length of a connecting pipe, thereby improving the sensitivity of the gas detection device; the device of the gas analysis apparatus can be protected by providing a fixing hole in the valve island, providing the heating device 20 in the fixing hole, and heating the valve island by the heating device 20, thereby heating the gas input into the first gas passage 100.
Further, a first filtering device 8 is further disposed on the first air path 100, and the first filtering device 8 is located at the front end of the pressure detecting device 9; the second filtering device 16 is arranged between the storage tank 25 and the switching valve 14, the first filtering device is arranged to filter the detected gas input into the first gas path 100, and the second filtering device 16 is arranged to filter the impurities in the gas by passing the gas input into the analyzer 5 from the storage tank 23, so that the smoothness of the gas path of the gas analyzing device is ensured, and the reliability of the gas analyzing device is improved.
Further, analysis appearance 5 is connected with display screen 19, display screen 19 is used for showing analysis appearance 5's testing result, when analysis appearance 9 finishes to gaseous detection, shows through display screen 10 and detects numerical value, and operating personnel accessible display screen 19 acquires the detection information, and is concrete, can set up pilot lamp 18 with the analysis appearance intercommunication, and after the analysis of analysis appearance was accomplished, can the electric quantity pilot lamp, reminds operating personnel to detect the completion.
Further, the panel 1 is further included, and the decompression unit 200 and the display screen 9 are both fixedly arranged on the panel 1; by integrally providing the display screens 19 of the decompression units 200 on the panel 1, the volume of the gas analysis apparatus can be reduced.
In a second aspect, the present application also discloses a method for sampling and analyzing the gas by using the gas analyzing device, and the following describes in detail the steps of analyzing the gas in the tank car by using the gas analyzing device with reference to fig. 3:
s1, enabling the gas to be detected to enter the first gas path, and reducing the pressure of the gas through the pressure reducing valve;
referring to fig. 1 and 2, the first hose 2 is communicated with the gas output end of the tank wagon, the sampling valve 6 is opened, the gas in the tank wagon 22 enters the pressure reduction unit 200, flows through the first filtering device 8 to be filtered, and is reduced in pressure through the pressure reduction valve 10.
S2, the switching valve 14 switches to the analyzer 5 to communicate with the first air path 100, and after the analyzer 5 communicates with one of the air paths 100 for a predetermined time, the switching valve 14 switches to the analyzer 5 to communicate with the storage tank 23.
When the control device 4 receives a detection signal of the pressure rise of the pressure detection device 9, the control valve 13 is controlled to be opened, original gas in the first gas path 100 is discharged by the discharge gas path 21, after the control valve 12 is opened for a preset time t2, the control device 4 controls the control valve 12 to be closed, and simultaneously the switching valve 14 is controlled to be switched to a state that the second input port is communicated with the output port, so that the analyzer 5 and the first gas path 100 are communicated, the gas in the tank car can flow to the analyzer 5 through the first gas path 100, the detected gas is conveyed to the analyzer 5 through the second input port and the output port, and the analyzer performs sampling analysis on the detected gas.
After the switching valve 14 is kept in a state that the second input port is communicated with the output port for a preset time t1, the analyzer 5 completes analysis of the tank car gas, the detection result of the analyzer 5 is displayed through the display screen 19, and meanwhile, the indicator lamp 18 is controlled to be turned on; the control device 4 controls the switching valve 14 to be switched to a state that the first input port is communicated with the output port, the storage tank 23 and the analyzer 5 are communicated, the first input port of the switching valve 14 is sequentially connected with the one-way valve 15, the second filtering device 16 and the shutoff valve 17, the storage tank 25 is communicated with the air inlet 7 of the shutoff valve 17, gas in the storage tank sequentially flows to the analyzer 5 through the shutoff valve 17, the second filtering device 16, the one-way valve 15 and the switching valve 14, the analyzer 5 is continuously protected by the gas in the storage tank, then a worker closes the sampling valve 6, and the first hose 2 is disconnected, so that the sampling can be finished
By using the method, the tank car is simpler, more convenient, quicker and safer to analyze and sample, and the requirement on the skill of an operator is not high.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A gas analysis apparatus, comprising: the device comprises a pressure reducing unit, a switching valve, an analyzer and a storage tank;
the pressure reducing unit comprises a first air path, the first air path is used for communicating an air source to be detected and the switching valve, and a pressure reducing valve is arranged on the first air path;
the switching valve comprises a first input port communicated with the storage tank, a second input port communicated with the first air path and an output port communicated with the analyzer; the switching valve can be selectively switched to enable the output port to be communicated with the first input port or the second input port.
2. The gas analysis apparatus according to claim 1, further comprising a pressure detection device and a control device; the pressure detection device is arranged on the first air path and used for detecting the gas pressure in the first air path;
the control device is electrically connected with the pressure detection device and the switching valve and is used for receiving a detection signal of the pressure detection device to control the switching valve to switch.
3. The gas analysis device according to claim 2, wherein a bleed gas path is provided on the first gas path, the bleed gas path being provided between the pressure relief valve and the switching valve.
4. The gas analysis device according to claim 3, wherein the discharge gas path is communicated with a control valve, and the control valve is electrically connected with the control device and used for controlling the on-off of the discharge gas path.
5. The gas analysis device according to claim 4, further comprising a flow limiting valve, wherein the flow limiting valve and the control valve are sequentially connected to the bleed gas path; the flow limiting valve is used for limiting the flow of the discharge air path.
6. The gas analysis apparatus according to claim 4, wherein the pressure detection means is provided at a front end of the pressure reducing valve.
7. The gas analysis apparatus according to any one of claims 1 to 6, wherein a safety valve is provided on the first gas passage, the safety valve being provided between the relief valve and the switching valve.
8. A method of sampling analysis using a gas analysis apparatus according to any one of claims 1 to 7, comprising the steps of:
s1, enabling the gas to be detected to enter the first gas path, and reducing the pressure of the gas through the pressure reducing valve;
s2, the switching valve is switched to the analyzer to be communicated with the first air path, and after the analyzer is communicated with one air path for a preset time, the switching valve is switched to the analyzer to be communicated with the storage tank.
9. The method according to claim 8, wherein a pressure detection device is disposed on the first gas path, the pressure detection device and the switching valve are both electrically connected to a control device, the pressure detection device obtains the pressure in the first gas path, and the control device controls the switching valve to switch when the pressure in the first gas path is greater than or equal to a predetermined value.
10. The method according to claim 9, wherein the step S2 includes:
when the pressure in the first gas path is greater than or equal to a preset value, the control device controls the control valve to be opened, so that the gas between the pressure release valve and the electromagnetic switching valve is discharged from the discharge gas path;
and after the control valve is opened for a preset time, the control device controls the control valve to be closed, controls the switching valve to switch, and enables the switching valve to be switched to the analyzer to be communicated with the first air passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723644.9A CN113970619A (en) | 2020-07-24 | 2020-07-24 | Gas analysis device and sampling analysis method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723644.9A CN113970619A (en) | 2020-07-24 | 2020-07-24 | Gas analysis device and sampling analysis method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113970619A true CN113970619A (en) | 2022-01-25 |
Family
ID=79585891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010723644.9A Pending CN113970619A (en) | 2020-07-24 | 2020-07-24 | Gas analysis device and sampling analysis method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113970619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749122A (en) * | 2022-06-15 | 2022-07-15 | 北京凯隆分析仪器有限公司 | Analysis tail gas recovery device |
-
2020
- 2020-07-24 CN CN202010723644.9A patent/CN113970619A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749122A (en) * | 2022-06-15 | 2022-07-15 | 北京凯隆分析仪器有限公司 | Analysis tail gas recovery device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5546789A (en) | Leakage detection system | |
| CN106706487B (en) | Remote full-flow calibration system for flue gas and ambient air on-line monitoring equipment | |
| US7329390B2 (en) | Device and process for measuring breath alcohol | |
| US4905498A (en) | Gaseous detection system | |
| CN105258867A (en) | Gas tightness detection system | |
| EP2884252A2 (en) | Manifold assembly for a portable leak tester | |
| CN113970619A (en) | Gas analysis device and sampling analysis method thereof | |
| CN201083591Y (en) | Silencer air tightness detection device | |
| JPH0251154B2 (en) | ||
| US3965920A (en) | Installations for monitoring oil content | |
| CN213423097U (en) | Gas analysis device | |
| CN110892245A (en) | Sample analyzer and sampling monitoring method | |
| US6230549B1 (en) | Hand-held fuel cap leakage tester | |
| US4348887A (en) | Apparatus for determining the effects of dilution and/or diffusion on the gaseous components of a gas flow | |
| JP2011504831A (en) | Apparatus and method for pressurizing an aircraft cabin structure and measuring the amount of leakage in the aircraft cabin structure | |
| GB1338318A (en) | Leak detector unit | |
| US3070988A (en) | Oxygen analyzer-standardizer | |
| CN201133863Y (en) | Gas-tight seal measuring apparatus | |
| JP3454406B2 (en) | Leakage and flow rate inspection device | |
| JP6425206B2 (en) | Helium leak detector | |
| CN209165032U (en) | Oxygen cylinder adjuster Hi-pot test platform | |
| CN205484225U (en) | Gas chromatograph convenient to judge and block up position | |
| JPH0523310A (en) | Electronic hemomanometer | |
| JPH0465967B2 (en) | ||
| US5551310A (en) | Detection device with a gas detector element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |