Carbon monoxide detecting apparatus

Details Carbon monoxide detecting apparatus Carbon monoxide detecting apparatus

G - Physics

01

N

150/20, 324/23

G01N 27/00 (2006.01) G01N 27/12 (2006.01) G01N 33/00 (2006.01)

Patent

CA 1114726

ABSTRACT OF THE DISCLOSURE A carbon monoxide detecting apparatus is provided which is substantially inaffected 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.

308104

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