ARITECH FIRE DB970 Intrinsically safe sensor base

Intrinsically safe sensor base.

The DP 951 optical smoke detector is equipped with an internal pulsing LED and an obtuse-angle photodiode. In clear air, the photodiode in the monitor does not receive light from the LED and produces a corresponding analog signal. This signal increases when smoke enters the chamber and the light is scattered on the photodiode. The signal is processed by the electronic circuit and transmitted to the control device exactly as in the case of the ionization smoke detector.