Ionization type smoke sensor

Details Ionization type smoke sensor Ionization type smoke sensor

G - Physics

08

B

358/21

G08B 17/10 (2006.01) G01N 27/66 (2006.01) G08B 17/113 (2006.01)

Patent

CA 1042564

ABSTRACT OF THE DISCLOSURE In a smoke sensor of ionization type having as essential component parts opposing pair electrodes providing for high impedance given by ionic current produced by a radioactive ray source, improvements are made to eliminate moisture deposition at least on the surface of the radioactive ray source and also prevent the high impedance from being accidentally changed due to a cause other than smoke, for instance a comparatively intense air stream which may otherwise cause a casual change of the high im- pedance. One electrode is provided by a cup-shaped member divided into upper and lower sections by a second electrode. Air flowing into the upper section is caused to circulate therein before flowing into the lower section.

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