Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-04-13
1988-06-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340630, G08B 1710
Patent
active
047498714
ABSTRACT:
A modular transceiver head including cooperative cover and base members operable as a transmitter or as a receiver of infrared energy. A controller including a processor is coupled to a transceiver head pair respectively operative as a transmitter and as a receiver of infrared energy to controllably project a beam of infrared energy therebetween through a protected region. The controller is periodically operative in a self-test mode to reduce the intensity of the projected-beam to simulate a smoke condition. Plural alarm thresholds are operator selectable to provide enhanced confidence detection, and particularized signal indications are provided to readily and quickly identify possible alarm and trouble conditions.
REFERENCES:
patent: 3752978 (1973-08-01), Kahl, Jr. et al.
patent: 4131888 (1978-12-01), Galvin
patent: 4173717 (1979-11-01), Lederer
patent: 4215271 (1980-07-01), Mudge et al.
patent: 4420746 (1983-12-01), Malinowski
patent: 4647785 (1987-03-01), Morita
Galvin Aaron A.
Giffone Ralph A.
Leff Kenneth J.
Mason Douglas L.
Schide John N.
ADT Inc.
Westin Edward P.
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