Ionisation detector chamber

H - Electricity – 01 – J

Patent

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358/21

H01J 47/02 (2006.01) G08B 17/10 (2006.01) G08B 17/113 (2006.01) H01J 41/08 (2006.01)

Patent

CA 1143871

ABSTRACT A smoke detector having an ionisation chamber with a central electrode which is covered by an insulator except at a restricted area closely spaced from a measuring electrode. A second electrode consisting of a perforated wall of the ionisation chamber. A conducting sleeve which is electrically connected to the second electrode surrounds the insulator on the first electrode, to minimize the effect of condensation of water on the first electrode.

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