Device for generating an alarm signal in the event of an environ

Details Device for generating an alarm signal in the event of an environ Device for generating an alarm signal in the event of an environ

1986-11-21

1988-05-17

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340510, 340511, 340518, 340657, 340661, 340632, 2503361, G08B 1900

Patent

active

047453990

ABSTRACT:
A device for generating an alarm signal in the event of an environmental abnormality has multiple sensors, with a multiplier associated with each sensor, an adder, and a comparator. The sensors are disposed in respective sensing volumes, which may be different. The sensors detect a level of smoke, heat, gas or other environmental abnormality within each sensing volume, and convert the level into an electrical analog signal. The associated multiplier multiplies a coefficient proportional to the sensing volume for the associated sensor with the analog signals from the sensor. The adder adds the outputs of the multipliers. The comparator generates an alarm signal at an output thereof when the output of the adder exceeds a predetermined value.

REFERENCES:
patent: 3744043 (1973-07-01), Walden et al.
patent: 4390869 (1983-06-01), Christen et al.
patent: 4421984 (1983-12-01), Farquhar et al.
patent: 4423326 (1983-12-01), Ball
patent: 4638304 (1978-01-01), Kimura et al.

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