GB1151240A - Improvements relating to Methods of and Instruments for Measuring the Concentration of Combustible Gas in an Air sample - Google Patents
Improvements relating to Methods of and Instruments for Measuring the Concentration of Combustible Gas in an Air sampleInfo
- Publication number
- GB1151240A GB1151240A GB5420866A GB5420866A GB1151240A GB 1151240 A GB1151240 A GB 1151240A GB 5420866 A GB5420866 A GB 5420866A GB 5420866 A GB5420866 A GB 5420866A GB 1151240 A GB1151240 A GB 1151240A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filaments
- bridge
- catalytic
- concentrations
- gas
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
- G01N27/185—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested using a catharometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
1,151,240. Measuring combustible gas concentrations, electrically. R. HœBNER. Dec.3, 1966, No.54208/66. Heading G1N. In a portable methane gas detector for mines there are two heated catalytic resistor filaments R 1 , R 2 Fig.1 and two heated non-catalytic reference filaments R 3 , R 4 , mounted in a chamber into which a gas sample is drawn through a duct 11 by a pump 17. The resistors form the arms of a bridge connected to a stabilized D.C. source through circuitry which ensures that the bridge is not energized until the pump finishes pumping. With methane concentrations up to 5% the catalytic combustion effects predominate to produce an indication on the bridge meter 21 in sector 21a Fig.2. With higher concentrations there may be insufficient oxygen to sustain combustion and the resistance of the filaments is determined by the thermal conductivity of the gas, which produces a greater heat loss from the higher temperature filaments R 1 , R 2 than from the lower temperature reference filaments R 3 , R 4 . In consequence the bridge is unbalanced in the opposite direction and the meter is calibrated to indicate accordingly in sector 21d.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5420866A GB1151240A (en) | 1966-12-03 | 1966-12-03 | Improvements relating to Methods of and Instruments for Measuring the Concentration of Combustible Gas in an Air sample |
| DE1967H0062038 DE1598578B2 (en) | 1966-12-03 | 1967-03-07 | Measuring device for measuring the concentration of a gas in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5420866A GB1151240A (en) | 1966-12-03 | 1966-12-03 | Improvements relating to Methods of and Instruments for Measuring the Concentration of Combustible Gas in an Air sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1151240A true GB1151240A (en) | 1969-05-07 |
Family
ID=10470277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5420866A Expired GB1151240A (en) | 1966-12-03 | 1966-12-03 | Improvements relating to Methods of and Instruments for Measuring the Concentration of Combustible Gas in an Air sample |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1598578B2 (en) |
| GB (1) | GB1151240A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112500A1 (en) * | 1991-04-17 | 1992-10-22 | Sewerin Hermann Gmbh | Determn. of gas concn. in gas-air mixt. - involves continuously comparing heat conductivity and heat tone measurements |
| GB2339474B (en) | 1998-07-10 | 2000-07-05 | Draeger Sicherheitstech Gmbh | A flashback barrier |
-
1966
- 1966-12-03 GB GB5420866A patent/GB1151240A/en not_active Expired
-
1967
- 1967-03-07 DE DE1967H0062038 patent/DE1598578B2/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE1598578B2 (en) | 1974-04-11 |
| DE1598578A1 (en) | 1971-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |