Environmental abnormality alarm apparatus

Details Environmental abnormality alarm apparatus Environmental abnormality alarm apparatus

1988-06-08

1989-05-16

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340500, 340510, 340511, 340522, G08B 2900

Patent

active

048313610

ABSTRACT:
An environmental abnormality alarm apparatus includes a sensor for detecting a fire, gas leakage, a burglar, or the like in a monitoring area, and a signal processor for receiving an output from the sensor and evaluating the output for an alarm determination reference and generating an alarm. A detecting unit is provided in the monitoring area of the sensor to detect a change in environmental condition resulting from objects or conditions other than those to be detected by the sensor, and an alarm determination reference is changed in accordance with an output state of the detecting unit during signal processing.

REFERENCES:
patent: 4420745 (1983-12-01), Dray et al.
patent: 4470047 (1984-09-01), Vogt et al.
patent: 4546344 (1985-10-01), Guscott et al.

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