Fire detection system

Details Fire detection system Fire detection system

1975-02-19

1976-09-28

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340409, G08B 1706

Patent

active

039835480

ABSTRACT:
A fire detection system of the type utilizing an optical detector with discriminating photo-cells connected in series to form a voltage divider, with the rise in voltage at the junction of the photo-cells being utilized at the input to an amplifier to energize an alarm or activate an extinguishing system, in which a remotely controlled switch is provided for applying to the signal lead at the detector a test voltage from the remote end of the power lead at the detector, whereby both the continuity of the power lead, the continuity of the signal lead and the operativeness of the power supply are tested.

REFERENCES:
patent: 3188593 (1965-06-01), Vasel et al.
patent: 3268881 (1966-08-01), Vasel
patent: 3550120 (1970-12-01), Kompelien
patent: 3588892 (1971-06-01), Scheidweiler
patent: 3678510 (1972-07-01), Walthard et al.

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