SMOKE-SENSITIVE ALARM Russian patent published in 2007 - IPC G08B17/10 

FIELD: fire-fighting, particularly fire alarms used to determine air absorbance increase from infrared light dissipation intensity.

SUBSTANCE: smoke-sensitive alarm comprises supply voltage reset circuit, two clamps to connect the alarm to signaling means loop, unidirectional conduction member, output signal conditioner, current-limiting element, condenser, indicator, pulse registration circuit, pulse former, clock oscillator, current switch, emitter, chamber with light-absorbing walls, photodiode, amplifier, as well as resistance switch, threshold element and resistor.

EFFECT: increased stability of smoke-sensitive alarm sensitivity due to possibility of simultaneous threshold phase control, duration and amplified photo-emf signal amplitude.

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