Analog-type fire detector

Details Analog-type fire detector Analog-type fire detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01)

Patent

CA 1235775

ANALOG-TYPE FIRE DETECTOR ABSTRACT OF THE DISCLOSURE An analog-type fire detector for detecting, in the form of an analog amount, a change in physical phenomena caused by occurrence of a fire, which intermittently detects a change in the ambient physical phenomena caused by occurrence of a fire, generates an analog signal corre- sponding to an amount of the change, converts the analog signal into a pulse signal of a duration corresponding to the level of the signal, generates periodically from a reference pulse generating means a reference pulse of a predetermined duration, detects by a discriminating means a difference in pulse durations between the output signal from the pulse duration converting means and the reference pulse, charges or discharges a capacitor corresponding to the difference detected, and hold-outputs for a prede- termined period by a hold-outputs means a signal corresponding to a voltage across the capacitor at the time when the charging or discharging is stopped.

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