Carbon monoxide detecting apparatus

Details Carbon monoxide detecting apparatus Carbon monoxide detecting apparatus

1978-07-25

1980-09-23

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

422 98, G01N 2704

Patent

active

042235502

ABSTRACT:
A carbon monoxide detecting apparatus is provided which is substantially unaffected by other coexisting gases in the gas atmosphere being sampled. The present invention includes a first carbon monoxide detecting element, a second carbon monoxide detecting element, and a comparing means. The first carbon monoxide detecting element is responsive to carbon monoxide gas and produces a stepwise change in a first film current over a first preselected range of carbon monoxide gas concentration. The second carbon monoxide detecting element is responsive to carbon monoxide gas and produces a stepwise change in a second film current over a second preselected range of carbon monoxide gas. The comparing means is responsive to the first and second film currents and provides an output difference signal .DELTA.E. The amplitude of the output difference signal .DELTA.E is in accordance with the absolute value difference between the first film current and the second film current. The two preselected ranges of carbon monoxide gas concentration can be achieved by appropriately altering the structure of the respective carbon monoxide detecting element and/or by making the substrate temperatures of the two carbon monoxide detecting elements different.

REFERENCES:
patent: 3479257 (1969-11-01), Shaver
patent: 3676820 (1972-07-01), Taguchi
patent: 3901067 (1975-08-01), Boardman, Jr. et al.
patent: 3955929 (1976-05-01), Kawakami et al.
patent: 4000089 (1976-12-01), Senda
patent: 4121548 (1978-10-01), Hattori et al.

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