Fire detector

Details Fire detector Fire detector

2000-01-18

2000-12-26

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340627, 340629, 340630, 340632, 340522, G08B 1710

Patent

active

061666475

ABSTRACT:
An improved fire detector is obtained by combining a conventional smoke particle sensor with a fire radicals odor sensor; the latter being an electronic nose tuned to respond to the presence of a family of radicals, produced by most fires, that is responsible for the odor associated with a fire. The conventional smoke particle sensor is prevented from producing an alarm signal unless the tuned electronic nose senses that the fire-produced radicals are increasing at a rate that exceeds a preset threshold rate. In another aspect of the invention, the smoke particle sensor is provided with a second, lower, threshold connected to a timer so that an alarm will be produced if the lower threshold is exceeded, without interruption, for a preset time. The improved fire detector, using the combined sensors, has greater sensitivity and a lower false alarm rate.

REFERENCES:
patent: 5650624 (1997-07-01), Wong
patent: 5691704 (1997-11-01), Wong
patent: 5831537 (1998-11-01), Marman

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