GB712698A - Improvements in or relating to gas detectors - Google Patents
Improvements in or relating to gas detectorsInfo
- Publication number
- GB712698A GB712698A GB1386951A GB1386951A GB712698A GB 712698 A GB712698 A GB 712698A GB 1386951 A GB1386951 A GB 1386951A GB 1386951 A GB1386951 A GB 1386951A GB 712698 A GB712698 A GB 712698A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas
- column
- mixture
- level
- heavier
- 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.)
- Expired
Links
- 239000007789 gas Substances 0.000 abstract 10
- 239000000203 mixture Substances 0.000 abstract 5
- 238000009792 diffusion process Methods 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 239000000356 contaminant Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000005485 electric heating Methods 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
An apparatus for detecting, or measuring the concentration of, a gas in a gas mixture compises a thermal diffusion column, means for feeding the gas mixture across one level of the column, a gas detection or concentration measuring device coupled at another level in the column and means for feeding the gas at said other level through the detection or measuring device. In the preferred apparatus shown in the Figure and designed for detecting a heavier gas in a mixture (e.g. an organic vapour in oxygen) the column 4 is in the form of concentric tubes whereby an annular diffusion space is formed. Gas from the pipe 1 enters this space through conduit 2 due to the convection current set up by electrical heating coil 8 about the exit conduit 3. It passes through a wire gauze 19 in order to avoid interference with the diffusion circulation set up in the column by means of the cooling jacket 15 surrounding the outer wall 12 and electric heating element 17 within the inner wall 13. The heavier component is concentrated in the lower part of the column and detected by means of the detector 7 which may be a katharometer. It is drawn through said detector by means of convection due to heating coil 10. According to the Provisional Specification the pressure is maintained constant by means of a valve in the pipe 1. The inner wall is "optimized" to the gas constants (viscosity, density, temperature) by means of steps and centred by three screws (one shown), 21. Thermocouples 22 and 23 indicate the temperature of the walls. If the apparatus of the invention is to be used with a contaminant lighter than the main gas, the mixture is fed <PICT:0712698/III/1> in at the bottom level and detected at the top, in the case of two impurities of which one is lighter and one heavier than the gas, the mixture is fed to the central portion of the column and the p impurities detected at each end. Applications are mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1386951A GB712698A (en) | 1951-06-12 | 1951-06-12 | Improvements in or relating to gas detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1386951A GB712698A (en) | 1951-06-12 | 1951-06-12 | Improvements in or relating to gas detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB712698A true GB712698A (en) | 1954-07-28 |
Family
ID=10030876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1386951A Expired GB712698A (en) | 1951-06-12 | 1951-06-12 | Improvements in or relating to gas detectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB712698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1186243B (en) * | 1962-11-03 | 1965-01-28 | Heraeus Gmbh W C | Devices for displaying the proportion of gaseous, high molecular weight impurities in a low molecular weight gas |
-
1951
- 1951-06-12 GB GB1386951A patent/GB712698A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1186243B (en) * | 1962-11-03 | 1965-01-28 | Heraeus Gmbh W C | Devices for displaying the proportion of gaseous, high molecular weight impurities in a low molecular weight gas |
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