DHI-HY-ASD620B-P Aspirating Smoke Detector is designed to monitor smoke in the early stages. Through the sampling pipe and high static pressure suction pump distributed in the protected area, the device draws in the extremely small smoke particles generated during the initial smoldering stage of a fire. These particles are then detected and analyzed in the laser detection chamber. Once the smoke concentration in the surrounding area reaches the alarm threshold, the detector will promptly send out a visual and audible alarm signal to alert the user to take immediate action. It will also simultaneously activate the relay to output a control signal.