Sensitivity controlled dual input fire detector

Details Sensitivity controlled dual input fire detector Sensitivity controlled dual input fire detector

1979-01-15

1980-09-30

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, 250574, 340517, 340630, G08B 1710

Patent

active

042258600

ABSTRACT:
An improved fire detector has both ionization chamber and photoelectric type products of combustion sensing devices, both of which must detect combustion for an alarm to be generated. The sensing devices are each adjusted to a quiescent sensitivity, but upon combustion being detected by one of the devices the sensitivity of the other device is automatically increased. In this manner, the detector operates very reliably to generate an alarm in the very early stages of a fire irrespective of whether the combustion process generates primarily visible or generally invisible type products of combustion, yet spurious generation of false alarm is minimized.

REFERENCES:
patent: 3611335 (1971-10-01), Ogden et al.
patent: 3895367 (1975-07-01), Visser
patent: 4090177 (1978-05-01), Urata et al.

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