Self compensating fire detection device

Details Self compensating fire detection device Self compensating fire detection device

1982-05-14

1985-04-23

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250381, G08B 1710, H01J 4702

Patent

active

045132020

ABSTRACT:
A device employing ionization principles for fire detection disclosing a configuration which allows compensation for adverse effects due to the flow of the gas through the device or due to the accumulation of dust and dirt therein. The detecting device includes two ionization chambers, each having a first member, such as a cylindrically shaped cup, having first and second conductive surface portions. Each chamber also includes a second member, such as a circular, electrode disc having two conductive surface portions. There is disposed in each chamber a radioactive source for ionizing the gas in the volumes intervening between respective pairs of surfaces. The area dimensions of the respective pairs of surfaces, the intervening volumes and the distances there between, and the relative orientation of the respective pairs are calculated and placed such that the ionization currents flowing between pairs of conductive surfaces are substantially equal and orthogonal to each other.

REFERENCES:
patent: 3913082 (1975-10-01), Hamm
patent: 4185196 (1980-01-01), Byrne
patent: 4213047 (1980-07-01), McCord

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