Smoke detectors

Details Smoke detectors Smoke detectors

1980-11-03

1982-06-22

Anderson, Bruce C.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250381, G01T 118

Patent

active

043364551

ABSTRACT:
The invention relates to smoke detectors of the kind comprising first and second electrodes defining an ionization chamber permitting entry of smoke, said ionization chamber being optionally divided into two regions by a collector electrode, a radioactive source to ionize gas in the ionization chamber and a potential difference applied across the first and second electrodes to cause an ion current to flow, which current is affected by entry of smoke, and provides an auxiliary electrode positioned in the ionization chamber, and means to maintain or create a potential difference between the first electrode and the auxiliary electrode. The auxiliary electrode may be used for testing or for adjustment of sensitivity.

REFERENCES:
patent: 2981840 (1961-04-01), Nahmias
patent: 4044263 (1977-08-01), Ried et al.
patent: 4121105 (1978-10-01), Solomon

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