Self-checking photoelectric smoke detector

Details Self-checking photoelectric smoke detector Self-checking photoelectric smoke detector

1979-12-10

1981-12-15

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 340636, 356439, G08B 1710

Patent

active

043062300

ABSTRACT:
A photoelectric smoke detector for providing indications of both alarm and trouble conditions is disclosed having a source of light, a detector apparatus having a light responsive device, said detector apparatus providing an output subject to a first change dependent upon the presence of smoke, the smoke detector further having a housing for mounting the source of light and the light responsive device, the housing having light path means for allowing light from the source of light to fall upon the light responsive device, the output from the detector apparatus being subject to a second change dependent upon trouble conditions, a first level sensor responsive to the first change to provide an alarm indication, and a second level sensor responsive to the second change to provide a trouble indication.

REFERENCES:
patent: 1828894 (1931-10-01), Freygang
patent: 2877453 (1959-03-01), Mendenhall, Jr.
patent: 3417392 (1968-12-01), Hansen, Sr. et al.
patent: 3728615 (1973-04-01), Hill et al.
patent: 3808534 (1974-04-01), Summers et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 4001800 (1977-01-01), Franks
patent: 4081795 (1978-03-01), Ogawa
patent: 4099178 (1978-07-01), Ranney et al.
patent: 4121110 (1978-10-01), Solomon
patent: 4144458 (1979-03-01), Doherty
patent: 4144459 (1979-03-01), Malinowski

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