Photoelectric type fire detector

Details Photoelectric type fire detector Photoelectric type fire detector

1995-12-13

1996-11-12

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

250573, 250574, 356431, G08B 2100

Patent

active

055744354

ABSTRACT:
A photoelectric type fire detector includes self-testing capabilities. An upper level threshold limit and a lower level threshold define a predetermined range for output levels of an amplifier connected to an output of a light receiving element. In a self-test mode, a gain set in the amplifier is increased automatically. The number of times in which the amplifier output level deviates from the predetermined range is counted. If the deviation count exceeds a predetermined count threshold, it is determined that the photoelectric type fire detector is abnormal.

REFERENCES:
patent: 3678488 (1972-07-01), Skala
patent: 4266220 (1981-05-01), Malinowski
patent: 4300133 (1981-11-01), Solomon
patent: 4388616 (1983-06-01), Machida
patent: 4687924 (1987-08-01), Galvin
patent: 4749871 (1988-06-01), Galvin et al.
patent: 4757306 (1988-07-01), Kimura
patent: 4977527 (1990-12-01), Shaw et al.
patent: 5473167 (1995-12-01), Minnis

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