Ionization type smoke detector with test circuit

Details Ionization type smoke detector with test circuit Ionization type smoke detector with test circuit

G - Physics

08

B

358/21

G08B 17/10 (2006.01) G01N 27/64 (2006.01) G08B 17/11 (2006.01) G08B 29/14 (2006.01)

Patent

CA 1182592

ABSTRACT An ionization detector of the type having a housing with electrodes and a radiation source for causing ion current flow between the electrodes, collector means for detecting, by a change in voltage, a drop in ion current flow, and means responsive to a predetermined change in collector voltage to provide an output signal, in which a test electrode is provided in the housing and means is provided for applying to the test electrode a predetermined voltage of a value that causes said predetermined change in voltage at the collector, whereby said output signal provided when said predetermined voltage is applied to the test electrode if said detector is operating satisfactorily.

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