Smoke detector with remote alarm indication

Details Smoke detector with remote alarm indication Smoke detector with remote alarm indication

1984-04-17

1985-05-14

Rowland, James L.

Communications: electrical

Condition responsive indicating system

With particular system function

307116, 324133, 340627, 340628, 340630, 340657, 340660, 340664, G08B 1900, G08B 1710

Patent

active

045175551

ABSTRACT:
A smoke detector receiving at two input terminals DC power from a remote source not only gives an alarm indication in response to a significant density of smoke, but senses the polarity of DC power at the terminals and generates a secondary signal, distinguishable from the alarm signal, when the polarity of power source is reversed.

REFERENCES:
patent: 2250214 (1941-07-01), Ashworth
patent: 2964682 (1960-12-01), Jansen
patent: 4149162 (1979-04-01), Enemark et al.

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