Ionization detector

Details Ionization detector Ionization detector

G - Physics

08

B

358/21

G08B 17/00 (2006.01) G08B 17/11 (2006.01) G08B 17/113 (2006.01) H01J 41/08 (2006.01)

Patent

CA 1074461

IONIZATION DETECTOR Abstract of the Disclosure An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode pro- truding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber, porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source of sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programable unijunction transistor oscillator circuit.

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