Ionization smoke sensor

Details Ionization smoke sensor Ionization smoke sensor

1976-02-05

1977-08-23

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, G01N 2312

Patent

active

040442624

ABSTRACT:
An ionization smoke sensor wherein the electric circuit of the sensor is surrounded by a first metallic case; an ionization chamber into which smoke from the exterior enters is constructed of a radiation source, an intermediate electrode and an outer electrode; the outer electrode is formed of a second metallic case; and the first and second metallic cases are electrically connected through a member of conductive elastomer, so that electric elements of the electric circuit are protected from external electrostatic charges.

REFERENCES:
patent: 3710110 (1973-01-01), Lampart et al.
patent: 3725011 (1973-04-01), Purt et al.

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