A 'Point Type' optical smoke detector can intelligently detect the smoke concentration of fire. The detector is in the monitoring state, the red indicator light flashes and the working current is small. If the smoke concentration exceeds the preset alarm threshold, the detector will start alarming with the red indicator light on and the relay will operate simultaneously. The alarm signal will be presented in the form of changeable action of the relay contacts and has the alarm locking function. Resetting the alarm can only be done through a short power off.
Smoke detectors are particularly useful in those scene where the fire is likely to generate a large amount of smoke but no smoke under normal situation, such as restaurants, hotels, teaching buildings, office buildings, computer rooms, communications machine rooms, archives, power distribution cabinets and other industrial and civil buildings. However it is not suitable for places with a large number of dust and water mist, neither for places where steam and oil mist may be produced, or where smoke is normally trapped.
Photoelectric smoke detector works according to the principle of induction to the smoke particles. An electrical signal occurs when a photosensitive electrode is exposed to a laser. And when the fire smoke obscures the laser, the electrode loses power and gives an alarm signal.
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