Smoke detectors

Details Smoke detectors Smoke detectors

G - Physics

08

B

358/21

G08B 17/10 (2006.01) G08B 17/113 (2006.01)

Patent

CA 1115860

ABSTRACT SMOKE DETECTORS A smoke sensing detector for use with an indicating device comprising a chamber adapted to allow smoke to pass therethrough; an inner electrode carrying a radioactive source; a collector electrode having one or more holes and mounted on the inner electrode by insulating pillars; and an outer electrode. The collector and outer electrodes define a first ionisation region, and the collector and inner electrodes define a second or reference ionisation region which is comparatively little affected by the passage of smoke. Mounting the collector electrode on the inner electrode is low cost and easy and ensures that, in the event of insulating failure, the device fails safe.

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