The Proengin MAB is a biological alarm monitor especially adapted to the harshness of use with fast start-up, reliability, environmental resistance and continuous operation for several days. The MAB is based on the flame spectrophotometry principle, which enables it to analyze continuously and in real time the light spectrum of the particles in suspension in the atmosphere. The MAB immediately detects any evolution regarding the atmospheric background and gives an alarm as soon as the measured biological characteristics exceed a threshold.