System of precocious detection of smokes for aspiration LaserSense ZLS4 (200m) with LCD screen. Equipped with a chamber of analysis for bundle of light laser with adjustable sensibility from 0 ' 0015 % up to 25 % osc/m. It incorporates 4 income of pipeline of ABS/PVC's sampling forming a zone of detection. Exits retardables for Alert, Prealarma, Alarm 1, Alarms 2 and Damages generally. Points of sampling by means of direct drill on the pipeline or by means of capillary pipe.