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.
Type:
Grant
Filed:
February 18, 1975
Date of Patent:
May 17, 1977
Assignee:
Maihak AG
Inventors:
Otto Blunck, Burkhart Seim, Karl-Heinz Retzow, Karl-Heinz Zorner
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