Ionization detector

Details Ionization detector Ionization detector

G - Physics

08

B

358/21

G08B 17/10 (2006.01) G08B 17/11 (2006.01) G08B 17/113 (2006.01)

Patent

CA 1076269

2A54/718 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 protruding into one chamber. The chamber containing the adjustable elec- trode 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 or 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 programmable unijunction transistor oscillator circuit. 1.

284655

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