Adaptive fire detector

Details Adaptive fire detector Adaptive fire detector

1992-04-27

1994-11-29

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

73 3101, G08B 1710

Patent

active

053693973

ABSTRACT:
The fire detector includes a carbon dioxide sensor and a microcomputer. When the rate of increase of the concentration of carbon dioxide at the sensor exceeds a threshold, an alarm is produced. The threshold is set at one of three possible levels by the microcomputer in response to the state of the atmosphere at the sensor as determined by the microcomputer based on several variables that are derived from the sensed concentration of carbon dioxide. The derived variables include the average concentration of carbon dioxide, the average rate of change of carbon dioxide concentration, the monotonicity of the increase or decrease of the carbon dioxide concentration and the range of concentrations sensed in each cycle of operation. The threshold setting is determined every ten seconds. In this way, the setting of the rate threshold is responsive to variations in the carbon dioxide level at the sensor that are caused by entities other than a fire, such as the presence or absence of people in a closed room.

REFERENCES:
patent: 4288790 (1981-09-01), Schnell
patent: 4526028 (1985-07-01), Hubner
patent: 5053754 (1991-10-01), Wong

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