Solid state sensor for carbon monoxide

Details Solid state sensor for carbon monoxide Solid state sensor for carbon monoxide

2007-06-26

2007-06-26

Lieu, Julie Bichngoc (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S632000, C073S023310, C073S031060, C136S216000, C136S216000

Reexamination Certificate

active

10524184

ABSTRACT:
A method of detecting a predetermined alarm condition in a combustion emission gas. The method comprises exposing to the gas a semiconductor gas sensor having a p-type mixed metal oxide semiconducting material of the first, second and/or third order transition metal series, the semiconducting material being responsive both to a change in concentration of a reducing gas in the surrounding atmosphere and to a change in concentration of oxygen in the surrounding atmosphere to exhibit a change in its electrical resistance. The resistance is monitored and an alarm signal is output if the resistance exceeds a predetermined value corresponding to the alarm condition.

REFERENCES:
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patent: 6009742 (2000-01-01), Balko
patent: 6046054 (2000-04-01), McGeehin et al.
patent: 1 008 847 (2000-06-01), None
patent: 1 041 039 (2000-10-01), None
patent: WO 93/08467 (1993-04-01), None
patent: WO 95/00836 (1995-01-01), None
patent: WO 01/38867 (2001-05-01), None

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