Discriminating fire sensor with thermal override capability

Details Discriminating fire sensor with thermal override capability Discriminating fire sensor with thermal override capability

1986-06-03

1987-03-03

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 100

Patent

active

046477764

ABSTRACT:
A fire sensor apparatus of the type having a discriminating fire sensor portion for detecting radiation in at least two different spectral bands associated with a fire and for providing an output signal in response to predetermined amounts of radiation in those spectral bands associated with a particular size and type of fire to be detected. A novel heat sensor channel is provided, which provides a further output signal in response to an amount of detected heat radiation greater than that associated with the fire of the type and size to be detected. A heat override function is thereby provided to permit the generation of an output signal even when contaminants block the action of the discriminating fire sensor portion.

REFERENCES:
patent: 3825754 (1974-07-01), Cinzori et al.
patent: 3931521 (1976-01-01), Cinzori

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