Method of detecting fire in an early stage

Details Method of detecting fire in an early stage Method of detecting fire in an early stage

1989-03-29

1991-04-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340693, G08B 1700

Patent

active

050050036

ABSTRACT:
To improve probability of detection in the early stages of fires, a fire alarm (1) with a temperature sensor (3) is proposed, having a structural member (12) that causes the sensor (3) to react only to temperature changes in the ambient air, and which change with a frequency of from 0.1 to 20 Hz. The fire alarm (1) becomes particularly insensitive to errors when there is a second fire sensor (7) that reacts to fire aerosol, there being a threshold value circuit (9) that lowers the threshold value for the fire aerosol sensor (7) when the temperature sensor (3) exceeds a preset threshold value.

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patent: 4746910 (1988-05-01), Pfister

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