Self-checking photoelectric smoke detector

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

G - Physics

08

B

340/77, 340/140.

G08B 17/10 (2006.01) G08B 17/107 (2006.01) G08B 29/04 (2006.01)

Patent

CA 1147416

ABSTRACT A photoelectric smoke detector for providing indi- cations 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 pres- ence 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.

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