Method and apparatus for determining the concentration of a gas

Details Method and apparatus for determining the concentration of a gas Method and apparatus for determining the concentration of a gas

1975-02-18

1977-05-17

Yudkoff, Norman

Chemistry: physical processes

Physical processes

Crystallization

23232E, 23253TP, 23254E, 23255E, G01N 3122

Patent

active

040239306

ABSTRACT:
The concentration of gas is determined by monitoring the coloration of a reagent test paper, or the like, whose color changes progressively or otherwise in response to continued exposure to such gas. The concentration is determined by determining the length of time which the reagent test paper must be exposed to the gas for the coloration of the test paper to reach a preselected threshold value.

REFERENCES:
patent: 2554414 (1951-05-01), McClendon
patent: 2602729 (1952-07-01), Curry
patent: 2622015 (1952-12-01), Cooper et al.
patent: 2800397 (1957-07-01), Offutt et al.
patent: 2895807 (1959-07-01), Sorg et al.

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