Detector

Details Detector Detector

G - Physics

01

N

358/21

G01N 27/64 (2006.01) G08B 17/11 (2006.01) G08B 17/12 (2006.01)

Patent

CA 1148278

ABSTRACT OF DISCLOSURE A single chamber ionisation-type fire detector. The ionisation current is directly amplified to provide a usable analogue signal by means of an operational amplifier which has a minimal effect on the ionisation current. The operational amplifier is simultaneously employed to maintain a constant potential difference in the chamber so that the ionisation current is not subjected to a fluctuating voltage. The amplified analogue signal drives a recorder and through analysis of the recorder output genuine fire alarm conditions can he distinguished from false alarm conditions.

340127

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