Smoke detector with photo-responsive means for increasing the se

Details Smoke detector with photo-responsive means for increasing the se Smoke detector with photo-responsive means for increasing the se

1977-05-19

1978-09-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, 356207, G01N 2126

Patent

active

041123107

ABSTRACT:
A particle detector which during periods of high ambient light is responsive to a particle concentration of a predetermined value to provide an output signal and during periods of low ambient light, is responsive to a substantially lesser particle concentration to sound an alarm.

REFERENCES:
patent: 3150264 (1964-09-01), Ehlert
patent: 3924252 (1975-12-01), Duston
patent: 3997271 (1976-12-01), Brugger et al.

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