Double detection circuit for conserving energy in fire detection

Details Double detection circuit for conserving energy in fire detection Double detection circuit for conserving energy in fire detection

1976-06-03

1977-05-31

Swann, III, Glen R.

Communications: electrical

Systems

Call station

3402271, 340237S, 340418, G08B 1700

Patent

active

040273024

ABSTRACT:
A highly sensitive first stage fire detector which does not use the system's battery power responds to the detection of a predetermined condition indicative of a possible fire in a protected area to energize a relay. The relay closes a first switch to supply battery power to a relatively more accurate, battery-powered, second stage detector and if the second stage detector verifies or affirms the existence of an actual fire, an alarm may be initiated or a fire-extinguishing system discharged, as desired. Since only the second stage detector draws power from the battery, it is normally kept isolated to conserve its charge unless the first stage detector energizes the relay. The circuit may also include a latching timer which insures that the relatively more accurate second stage detector has sufficient time to verify or disaffirm the existence of a fire even if the first stage detector were to immediately return to its normal condition.

REFERENCES:
patent: 3380045 (1968-04-01), Lindberg
patent: 3603973 (1971-09-01), Hough
patent: 3653016 (1972-03-01), Cormier

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