Selectively testable fire detector

Details Selectively testable fire detector Selectively testable fire detector

1982-02-24

1985-02-05

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340512, 340513, G08B 2900

Patent

active

044980744

ABSTRACT:
A selectively testable fire detector comprises a fire detecting circuit supplied with a first voltage and which detects smoke and/or temperature, a self-holding circuit which is actuated by the output signal of the fire detecting circuit, a counter which counts pulses superimposed on the first voltage and outputs a signal when the counted number reaches a predetermined number assigned thereto, a latch circuit which latches the output signal of the counter and transmits to the fire detecting circuit a signal which actuates the fire detecting circuit, and a reset signal generating circuit which resets the counter and latch circuits by a second voltage which is higher than the first voltage.

REFERENCES:
patent: 3657713 (1972-04-01), Sasaki et al.
patent: 3848241 (1974-11-01), LeNay et al.
patent: 4032909 (1977-06-01), Boyce

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