Fire sensor device

Details Fire sensor device Fire sensor device

1984-04-17

1987-01-27

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Flame light source

340578, G08B 1712

Patent

active

046396055

ABSTRACT:
A fire sensor device of the type capable of detecting flame and smoke. The fire sensor device has a detector unit having a condenser lens for determining variations in the brightness of a space on the basis of variations in the illumination thereof which occur due to the movement of flames of a fire or the presence of smoke therein. The fire sensor device has two frequency-detection circuits which have different set points and to which the detector unit is connected. The frequency and amplitude of a signal output from the detector unit and the number of pulses generated by the detector unit are computed, and the presence of a fire is detected on the basis of the duration of the signal.

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