Ionization smoke detector and alarm system

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

1976-04-09

1977-07-19

Caldwell, John W.

Communications: electrical

Systems

Call station

340249, 340384E, G08B 1710, G08B 1900

Patent

active

040372065

ABSTRACT:
An ionization smoke detector particularly suited to residential use 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: 3594751 (1971-07-01), Ogden et al.
patent: 3693110 (1972-09-01), Briggs, Jr. et al.
patent: 3728706 (1973-04-01), Tipton et al.

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