Ionization analyzing air pollution, smoke and fire alarm device

Details Ionization analyzing air pollution, smoke and fire alarm device Ionization analyzing air pollution, smoke and fire alarm device

1974-04-11

1976-01-27

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250381, 340237S, G01T 118, H01J 3928

Patent

active

039354652

ABSTRACT:
An ionization analyzing alarm system of extreme accuracy independent of atmospheric turbulences caused by fire and of minute dimensions, ease and safety of manufacture, assembly and repairs and devoid of forced air devices, is provided, having an air baffle zone, a first ionization chamber with advantageously located electrodes, radioactive source and circuitry and optionally a second ionization chamber with radioactive source and an additional electrode, the central of the three electrodes serving both chambers and with sensitivity controls.
In a preferred embodiment, an ionization fire alarm signal box is described comprising an ionization measuring chamber with a tubular housing wall, electrodes mounted in the measuring chamber parallel to each other and perpendicularly to the axis of the tubular housing wall, means to apply an electric potential to the electrodes, at least one radioactive source which produces an ionization stream between the electrodes; in which structure the tubular housing wall projects in axial direction above the electrodes and supports at one of its ends a covering which permits the entry of ambient air into the measuring chamber and whose edge is fastened to the tubular housing wall, said covering being axially spaced from the adjacent electrode, and creating a baffle chamber.

REFERENCES:
patent: 3358140 (1967-12-01), Curran et al.
patent: 3560737 (1971-02-01), Skildum
patent: 3662177 (1972-05-01), Sasaki

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