Extended life smoke detector

Details Extended life smoke detector Extended life smoke detector

1992-06-15

1995-08-22

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340636, 320 48, G08B 2100

Patent

active

054444349

ABSTRACT:
The present invention is an improvement in battery powered smoke detectors. A smoke detector is powered by a series connection of two Li/SOCl.sub.2 cells having a capacity of about 2 amp hours. The smoke detector draws a quiescent current of about 7 .mu.A. A low voltage alarm activates when the battery voltage falls below about 6.0 volts upon the periodic application of about a 250 .mu.A to about a 1 mA battery test pulse. The cells are soldered directly into the smoke detector PC board and the smoke detector is placed in an unopenable case to deter battery removal. Smoke detector life expectancy including the battery is 15 years.

REFERENCES:
patent: 4231026 (1980-10-01), Sullivan
patent: 5115223 (1992-05-01), Moody
"Kodak and Dicon Systems Team Up to Promote new Long-Life Lithium Batteries and Smoke Detectors", New Release Dec. 1988.
"Extended-Life Non-Removable Battery for Smoke Detectors", 1991.

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