System of precocious detection of smokes for aspiration LaserScanner. Designed, made and certificate according to norm EN54-20. Equipped with a chamber of analysis for bundle of light laser with adjustable sensibility from 0 ' 005 % up to 20 % osc/m with autolearning. It incorporates 4 income of pipeline of sampling forming zones independent from detection. 4 configurable thresholds of alarm (Alert, Action, Fire 1 and Fire 2) and 2 thresholds of breakdown (Maintenance and general Failure).