ASES 600 Series 10-100mA Photoelectric Smoke Detector, AS-601-SD

Photoelectric Smoke Detector Detects the Smoke by a Couple of Infrared Diodes

The Principle of Detection is Granule in the Smoke can Reflect Infrared Light, Infrared Diodes are Placed in the Special Chamber, the Chamber Reflects External Light, But Does Not Affect the Smoke Into It

While There is No Smoke, the Diode can Receive Very Weak Infrared Light, When the Smoke Entering the Chamber, Diode can Receive More & More Light