Smoke detector

Details Smoke detector Smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G01N 21/01 (2006.01) G08B 17/107 (2006.01) G08B 17/11 (2006.01)

Patent

CA 1067597

ABSTRACT OF THE DISCLOSURE A smoke detector which has a rate detector for detect- ing the rate of increase of smoke concentration. In one embodi- ment of the invention an alarm signal is provided when the rate of increase of smoke concentration exceeds a predetermined rate. In another embodiment of the invention, the smoke detector has means for providing an alarm signal if the smoke concentration reaches a predetermined value, and also has means responsive to d rate of increase of smoke concentration above a predetermined rate to cause said alarm to be actuated at a smoke concentration sub- stantially lower than said predetermined concentration.

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