Contact combustion type carbon monoxide sensor

Details Contact combustion type carbon monoxide sensor Contact combustion type carbon monoxide sensor

1993-09-02

1994-04-19

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

422 94, H01C 700, G01N 3112

Patent

active

053049764

ABSTRACT:
A contact combustion type carbon monoxide sensor having no sensitivity to H.sub.2, C.sub.2 H.sub.5 OH and other gases but having a CO sensitivity of 25 to 50 mV at a bridge voltage of 6 to 12 V and a concentration of 500 ppm. Each coil is made of a Fe.Pd system alloy wire material having a large diameter, a specific resistance value, a Vickers' hardness value and a temperature coefficient values each falling within a specific range. A catalyst comprising Cu.sub.2 O, ZnO, MnO.sub.2 and Pt black is formed on the upper surface of the coil of an active portion, and a catalyst comprising CuO and Cr.sub.2 O.sub.3 is formed on the upper surface of the coil of a dummy portion.

REFERENCES:
patent: 4296399 (1981-10-01), John
patent: 4396899 (1983-08-01), Ohno

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