Method and apparatus for gas analysis

Chemistry: physical processes – Physical processes – Crystallization

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422 93, 422 97, G01N 2716, G01N 2718

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active

041697081

ABSTRACT:
A method and apparatus for determination of oxygen or hydrogen levels in a gas sample. In accordance with the method, a flowing stream of a gas sample containing a minor amount of diluent gas, oxygen and/or hydrogen is provided. A predetermined amount of a gaseous fuel is combined with the flowing stream of the gas sample to provide a reactive mixture. The reactive mixture is passed over a first sensing element and over a second sensing element. Prior to passing the flowing stream of the gas sample over the second sensing element, the stream is passed over a catalyst to cause reaction of oxygen and/or hydrogen with the fuel to produce water and heat. This causes a temperature and a moisture differential to exist between the first sensing element and the second sensing element. The difference in the moisture level or the temperature differential is converted to an electric signal. The electric signal produced is compared with a reference standard whereby the level of the oxygen and/or hydrogen is determined.

REFERENCES:
patent: 3088809 (1963-05-01), Boatman
patent: 3488155 (1970-01-01), Ayers
patent: 3567394 (1971-03-01), Betz
patent: 3752652 (1973-08-01), Vleesschauwer
patent: 3791936 (1974-02-01), Pebler et al.

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