DISCRIMINATING FIRE SENSOR WITH THERMAL OVERRIDE CAPABILITY

摘要

DISCRIMINATING FIRE SENSOR WITH THERMAL OVERRIDE CAPABILITY A fire sensor apparatus (10) of the type having a discriminating fire sensor portion (12, 14) for detecting radiation in at least 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 (50) 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.