Catalytic detecting apparatus for detecting combustible gases an

Details Catalytic detecting apparatus for detecting combustible gases an Catalytic detecting apparatus for detecting combustible gases an

1975-04-21

1977-04-26

Caldwell, John W.

Communications: electrical

Systems

Call station

23254E, G08B 1710

Patent

active

040204804

ABSTRACT:
Apparatus for detecting combustible gases and vapors, and comprises catalytic sensors selectively sensitive to the presence in a given environment of a potentially dangerous constituent such as a hydrocarbon gas and arranged to produce a signal representative of the presence of the constituent, a normally deactivated transducer responsive on activation to the output of the sensors and effective to produce an output signal indicative of the presence of the constituent in a concentration above a predetermined level, a pulse generating circuit arranged automatically and periodically to activate the sensors for a selected relatively short interval during which detection but not poisoning can occur and subsequently to deactivate the sensors for a relatively long period, fault detecting circuits for producing a fault signal in the event of circuit failure or impending power failure, and alarm circuitry for providing a differentiated warning in response to the fault signal and in response to the output signal.

REFERENCES:
patent: 2857251 (1958-10-01), Krogh
patent: 2904406 (1959-09-01), Moore
patent: 3147465 (1964-09-01), Brown et al.
patent: 3505663 (1970-04-01), Yule
patent: 3543260 (1970-11-01), Engh
patent: 3678489 (1972-07-01), Scherban et al.
patent: 3801972 (1974-04-01), Ho Kim et al.

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