Environmental abnormality alarm apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 16, 1989
Grant Date -
N/A
app pub date -
Jun 8, 1988
filing date -
Jun 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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