Description
The devices consist of an LED light source and a silicon photodiode sensor. Under normal standby conditions, the sensor does not detect any light from the pulsing LED. In the event of a fire, smoke enters the detector, causing light to be scattered by the smoke particles and subsequently received by the photodiode. This light is converted into an electronic signal, which is then analyzed by the comparator. If two consecutive signals that surpass a predefined threshold are detected within a set time frame, the time delay circuit activates the SCR switch to trigger the alarm signal. The status LED remains illuminated throughout the alarm period.
