Smoke detector with improved testing

Details Smoke detector with improved testing Smoke detector with improved testing

1988-01-29

1989-09-26

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340514, 340945, G08B 1710, G08B 2900

Patent

active

048703940

ABSTRACT:
A light scatter smoke detector includes an infrared light source and light sensor in a smoke chamber, the chamber including an adjustable screw which serves as a scatter reflector to provide an operating voltage used both in normal operation and for testing. A dual channel is also provided by a splitting off some light from the light source into a separate reference channel which is also used for threshold detection or proper ratioing.

REFERENCES:
patent: 3983548 (1976-09-01), Tufts
patent: 4065759 (1977-12-01), Handing
patent: 4642615 (1987-02-01), Suzuki
patent: 4749871 (1988-06-01), Galvin et al.

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