Measuring and testing – Gas analysis – Gas chromatography
Patent
1977-01-17
1978-09-12
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
G01N 710
Patent
active
041127366
ABSTRACT:
A detector for detecting the presence of a particular gas in a mixture of gases comprises a space bounded in part by a membrane which is preferentially permeable to the particular gas and bounded in part by a thin flexible diaphragm. The diaphragm is arranged to control flow through a nozzle to which, in use, a gas is supplied at a steady pressure, and means are provided to supply the mixture of gases to one face of the membrane. In use, when the particular gas is present in the mixture being supplied to the one face of the membrane the particular gas permeates through the membrane from the one face to change the pressure in the space and cause the diaphragm to bow and produce a change of pressure in the supply of gas upstream from the nozzle. The change in pressure in the supply of gas upstream from the nozzle constitutes a pneumatic signal indicating the presence of the particular gas in the mixture. The membrane and the thin flexible diaphragm may be formed from the same piece of material.
REFERENCES:
patent: 1825024 (1931-09-01), Tandberg
patent: 2045379 (1936-06-01), Bennett
patent: 2561414 (1951-07-01), Potts
patent: 3411534 (1968-11-01), Rose
patent: 3438241 (1969-04-01), McKinley
patent: 3450152 (1969-06-01), Ouellette
patent: 3871228 (1975-03-01), Weiss
patent: 3926561 (1975-12-01), Lucero
patent: 3977232 (1976-08-01), Hickam et al.
Harris Ernest D.
Wheldon Alfred G.
Kreitman Stephen A.
The Distillers Company (Carbon Dioxide) Ltd.
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