Dual projected-beam smoke detector

Details Dual projected-beam smoke detector Dual projected-beam smoke detector

1976-08-18

1978-12-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250575, 250578, G08B 1710

Patent

active

041318889

ABSTRACT:
A smoke detector system including two projected beams operating in parallel, the outputs of which are processed to distinguish between outputs caused by smoke and outputs caused by other conditions affecting either or both beams. By comparing both the occurrence and the duration of reduced intensity outputs from the two beams, discrimination against false-alarm conditions is achieved.

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patent: 3924252 (1975-12-01), Duston
patent: 3982130 (1976-09-01), Trumble

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