Semiconductor sensors and method for detecting fires using such

Details Semiconductor sensors and method for detecting fires using such Semiconductor sensors and method for detecting fires using such

1996-11-22

1999-01-05

Swann, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340577, 340595, 340598, G08B 1700, G08B 17117

Patent

active

058567801

ABSTRACT:
A fire detector, for connection in a fire protection/alarm system, comprises an array of sensors, or a single sensor, of the semiconductor resistor type impregnated with a noble metal. The detector is responsive, by way of a decrease in its resistance, to an increase in any one or more parameters indicative of a fire, namely the atmospheric concentrations of carbon monoxide, hydrogen and water vapor, and temperature, so that a fire is detected regardless of which of these indicators is present. The sensor responds to all of the parameters, and the output signal simultaneously represents changes in all the parameters.

REFERENCES:
patent: 4090177 (1978-05-01), Urata et al.
patent: 4319229 (1982-03-01), Kirkor
patent: 4640628 (1987-02-01), Seki et al.

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