GB1144273A - Improvements in catharometers - Google Patents
Improvements in catharometersInfo
- Publication number
- GB1144273A GB1144273A GB3149967A GB3149967A GB1144273A GB 1144273 A GB1144273 A GB 1144273A GB 3149967 A GB3149967 A GB 3149967A GB 3149967 A GB3149967 A GB 3149967A GB 1144273 A GB1144273 A GB 1144273A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- enclosure
- bridge
- measuring
- air
- 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)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1,144,273. Katharometers. CHARBONNAGES DE FRANCE. July 7, 1967 [July 7, 1966], No.31499/67. Heading G1N. [Also in Division H1] The measuring filament of a katharometer, particularly for use in measuring the methane content of air, is made of 10% rhodenized platinum. In one embodiment, the filament D1, Fig. 1, situated in an enclosure 4, Figs. 2, 3 (not shown), open to the test atmosphere via holes (3), (6), is connected in a Wheatstone bridge with an identical comparison filament C 1 in an enclosure 12, Figs. 4, 5 (not shown), filled with pure air, and with two balancing resistors Rl, R2 and potentiometer LP 1 . The input voltage to the bridge is regulated so that the temperature of filament D1 is maintained at about 400‹C. in pure air. In a second embodiment, two measuring and comparison filaments D1, D2 and C 1 , C 2 , Fig.7, are used, each pair of filaments situated in a single enclosure 17, 12, Figs. 8, 9 (not shown), respectively, and connected in opposite arms of the bridge. The enclosure 17 is made of material permeable to air. The out-ofbalance voltage of the bridge, indicative of the methane content, is converted in a coder to a signal whose frequency depends on its input voltage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR68620A FR1494162A (en) | 1966-07-07 | 1966-07-07 | Improvements in katharometers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1144273A true GB1144273A (en) | 1969-03-05 |
Family
ID=8612793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3149967A Expired GB1144273A (en) | 1966-07-07 | 1967-07-07 | Improvements in catharometers |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1648857A1 (en) |
| FR (1) | FR1494162A (en) |
| GB (1) | GB1144273A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1566630A1 (en) * | 2002-11-21 | 2005-08-24 | Matsushita Electric Industrial Co., Ltd. | Gas detector |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3622307A1 (en) * | 1986-07-03 | 1988-01-14 | Draegerwerk Ag | MEASURING DEVICE FOR DETECTING THE CONTENT OF COMBUSTIBLE GASES IN AIR MIXTURES |
| EP0358925A3 (en) * | 1988-09-14 | 1990-11-28 | Seiko Co.,Ltd. | Catalytic combustion type co gas sensor |
-
1966
- 1966-07-07 FR FR68620A patent/FR1494162A/en not_active Expired
-
1967
- 1967-07-06 DE DE19671648857 patent/DE1648857A1/en active Pending
- 1967-07-07 GB GB3149967A patent/GB1144273A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1566630A1 (en) * | 2002-11-21 | 2005-08-24 | Matsushita Electric Industrial Co., Ltd. | Gas detector |
| EP1566630A4 (en) * | 2002-11-21 | 2012-03-07 | Panasonic Corp | Gas detector |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1494162A (en) | 1967-09-08 |
| DE1648857A1 (en) | 1971-01-21 |
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