Operation test circuit for fire detectors

Details Operation test circuit for fire detectors Operation test circuit for fire detectors

1982-02-24

1985-03-19

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340518, 340502, G08B 2900

Patent

active

045062552

ABSTRACT:
A test circuit for fire detection systems and the like is designed for use with detectors which bridge across a pair of lines. The detectors become conductive if a condition such as a fire is detected, or if a predetermined number of test pulses is applied to them. Test pulses are applied across the pair of lines. A relay is connected to one of the lines and, when latched, generates an alarm signal. A resistor is placed in series with the relay so the relay cannot latch even when one of the detectors has become conductive. A first circuit produces a confirmation signal when at least one of the detectors is conductive. This signal is delayed in an RC network. A second circuit shorts the resistor after the delayed confirmation signal is received, so that the relay can latch to generate the alarm signal.

REFERENCES:
patent: 3566399 (1971-02-01), Weld
patent: 3848241 (1974-11-01), Le Nay et al.
patent: 4024519 (1977-05-01), Galvin et al.

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