SMOKE FIRE ALARM Russian patent published in 2009 - IPC G08B17/10 

FIELD: physics, alarm.

SUBSTANCE: invention is related to the field of fire alarm and may be used in fire alarm systems for detection of increased air optical density by intensity of infrared radiation scattering. Device comprises microcontroller (1), generator (2) of smoke registration signal, current and voltage limiter (3), voltage-current transducer (6), the first (4), second (13) and third (15) elements of single-sided conductivity, two capacitors (7,8) and two input terminals (5,12), radiator (9), photodetector (11), optical chamber (10) with light-absorbing walls, optical indicators (16,17) and parallel voltage stabiliser (14). Due to application of parallel stabiliser, two additional elements of single-sided conductivity and optical indicators with their connections to other elements of circuit, possibility is achieved to generate additional optical signals by alarm both in duty mode and in "Fire" condition.

EFFECT: improved information value.

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