Dual scattering-type smoke detector with cross-checking

Details Dual scattering-type smoke detector with cross-checking Dual scattering-type smoke detector with cross-checking

1987-07-29

1988-09-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250575, 340630, G01N 1506

Patent

active

047695501

ABSTRACT:
Two photoelectric smoke detectors are arranged so that each smoke detector in turn verifies operation of the other smoke detector. Each smoke detector has a light source and a photodetector which is not directly illuminated by the light source. A smoke detection signal is issued when light from such a light source is scattered to the respective photodetector. The two smoke detectors are arranged so that a small amount of light from each light source illuminates the photodetector of the other smoke detector. A fault signal is issued when such a photodetector is not illuminated by the other light source.

REFERENCES:
patent: 4017193 (1977-04-01), Loiterman
patent: 4647785 (1987-03-01), Morita
patent: 4695734 (1987-09-01), Honma et al.

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