Ionization smoke detector and alarm system

Details Ionization smoke detector and alarm system Ionization smoke detector and alarm system

1973-10-25

1976-01-20

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250389, 313 54, G01T 118

Patent

active

039341453

ABSTRACT:
An ionization smoke detector particularly suited to residential use is disclosed. The detector is battery-operated and is connected with a non-latching, pulsating alarm circuit. The detector has a sensing chamber formed by a perforated metallic shell and an electrode within which an insulated radiation source is centrally positioned to generate an ionization current for detecting smoke or other similar aerosols. The alarm circuit provides a pulsating alarm signal when smoke levels above a predetermined value are sensed. The alarm circuit also includes a low voltage detection circuit for sounding the alarm when the end of useful battery life is approaching.

REFERENCES:
patent: 3460124 (1969-08-01), Smith et al.
patent: 3681603 (1972-08-01), Scheidweiler et al.
patent: 3767917 (1973-10-01), Lampart et al.

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