Optical fire detection system

Details Optical fire detection system Optical fire detection system

1973-07-19

1977-01-11

Caldwell, John W.

Communications: electrical

Systems

Call station

340409, 250554, G08B 2100, G01N 2158

Patent

active

040030393

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 as the input to an amplifier to energize an alarm or actuate an extinguishing system, in which the ground wire to the remote optical detectors is also used as the ground wire between the amplifier and the actuating means for the alarm or the extinguishing system, whereby a break in the ground wire, which causes a rise in voltage at the junction, is prevented from causing a false alarm, since said break also breaks the circuit between the amplifier and the actuating means.

REFERENCES:
patent: 3122638 (1964-02-01), Steele et al.
patent: 3378829 (1968-04-01), Alafi et al.
patent: 3564524 (1971-02-01), Walthard et al.

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