Central smoke alarm and annunciator

Details Central smoke alarm and annunciator Central smoke alarm and annunciator

1982-03-26

1984-11-06

Rowland, James L.

Communications: electrical

Condition responsive indicating system

With particular system function

340512, 340628, 340629, G08B 2900

Patent

active

044815026

ABSTRACT:
A central smoke detection system for a building having multiple rooms utilizes low cost commercial smoke detectors in each room. Each detector includes a steady high current alarm mode, a low current idle mode and a high pulse current test mode. A central power source supplies power to the detectors via one common lead and a separate power lead to each detector. A resistor in each power lead at the central location provides for monitoring of the mode of each smoke detector. A central monitor operates a visual smoke alarm responsive to the steady high current mode which indicates the room in which a detector is in the alarm mode and a visual fault alarm responsive to the absence of the high test pulse current indicating the room in which a detector is inoperative. A common central smoke and fault alarm, both audible and visual is also provided.

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patent: 3160866 (1964-12-01), Meili
patent: 3530450 (1970-09-01), Walthard et al.
patent: 3564524 (1971-02-01), Walthard et al.
patent: 3588892 (1971-06-01), Scheidweiler
patent: 3603949 (1971-08-01), Walthard
patent: 3657713 (1972-04-01), Sasaki et al.
patent: 3665461 (1972-05-01), Gnagi et al.
patent: 3952294 (1976-04-01), Emerson et al.
patent: 4088986 (1978-05-01), Boucher
patent: 4287515 (1981-09-01), Raber et al.

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