Fire detector

Details Fire detector Fire detector

1983-01-20

1985-08-27

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340530, 340628, 340595, 328 6, G08B 2900, G08B 1706

Patent

active

045381372

ABSTRACT:
In a fire detector that includes a sensor for producing an output voltage corresponding to smoke concentration, temperature, etc., there is provided a charge-and-discharge circuit to be reset by the turning ON of a switching circuit which is made ON at a fixed voltage. The output of the charge-and-discharge circuit and the output of a sensor are applied to the switching circuit to vary the ON period of the switching circuit corresponding to the output voltage of the sensor. Any irregularity in the sensor can be monitored by changes in the ON period.

REFERENCES:
patent: 3657713 (1972-04-01), Sasaki et al.
patent: 3665461 (1972-05-01), Gnagi et al.
patent: 3717862 (1973-02-01), Sasaki
patent: 3979740 (1976-09-01), Forbat et al.

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