Combination combustion-products detector

Details Combination combustion-products detector Combination combustion-products detector

1979-07-27

1982-02-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340629, 340630, G08B 1710

Patent

active

043161847

ABSTRACT:
A photosensor circuit produces a first sensor signal having an amplitude related to the quantity of smoke sensed thereby. An ionization sensor circuit produces a second sensor signal having an amplitude also related to the quantity of smoke sensed thereby. A first circuit provides a first output only when both the sensor signals exceed a first level. A second circuit provides a second output when either of the sensor signals exceeds a second higher level. An alerting-signal generator is coupled to both of the circuits and is responsive to either output to provide an alerting signal.

REFERENCES:
patent: 3801972 (1974-04-01), Hokim et al.
patent: 3846772 (1974-11-01), Peberdy
patent: 3868663 (1975-02-01), Ray
patent: 4091364 (1978-05-01), Webb, Jr.

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