Fire and smoke sensing system

Details Fire and smoke sensing system Fire and smoke sensing system

1978-01-19

1979-09-18

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340517, G08B 1710

Patent

active

041684974

ABSTRACT:
At least two sensors are used, providing electrical output signals to indicate alarm conditions, one of the sensors being a bipolar ion sensor having a shielded ion chamber formed to slow or brake atmospheric currents therethrough, and a second sensor which operates essentially in unipolar mode having an ion chamber freely accessible to atmospheric flow therethrough.

REFERENCES:
patent: 2994768 (1961-08-01), Derfler
patent: 3530450 (1970-09-01), Walthard et al.
patent: 3611335 (1971-10-01), Ogden et al.
patent: 3728706 (1973-04-01), Tipton et al.

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