SMOKE SIGNALING DEVICE Russian patent published in 2001 - IPC

FIELD: automatic fire signaling systems. SUBSTANCE: in first variant of invention smoke signaling device includes receiving chamber with additional reflecting member; modulator with additional output and additional circuit having connected in series analog-to-digital converter, parallel register, digital-to-analog converter and adder. In second variant of invention smoke signaling device includes receiving chamber with additional reflecting member; modulator with additional output and two additional circuits. One of said circuits includes connected in series: analog-to-digital converter, first parallel register, first digital-to-analog converter, divider with limiting unit, multiplier and adder. Second circuit includes controlled switch, second parallel register and second digital-to-analog converter. Device prevents false operations caused by increased reflection from inner surface of receiving chamber when there is no smoke and eliminates conditions of non-operations when there is limit concentration of smoke in receiving chamber caused by deteriorated properties of optical system. EFFECT: enhanced reliability of smoke signaling device. 2 cl, 5 dwg