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about smoke detector in detail also write abot its connections.
There are two types :

1 .OPTICAL DETECTOR

The Optical Smoke Detector uses a light source to detect smoke. The Infra-Red LED is a lens that shots a beam over a large area. If smoke is present in the room, it enters the optical chamber, having smoke particles scatter and sensor sets of the alarm.. Optical Smoke Detectors are less sensitive to false alarm fire, such as minor smoke from candles, cooking, steam, etc.
2.IONIZATION DETECTOR 
   The Ionization Smoke Detector is able to sense smoke particles that are too small for the naked eye. Through alpha radiation, the ionization smoke detector passes through the air-filled space container, allowing flow of electrodes.If any smoke gets inside the chamber and absorbs the alpha particles, it lowers the level of ionization, hurting the flow of electrodes, thus setting off the alarm. Unlike the Optical Smoke Detector, this model is very inexpensive and more commonly placed in individual homes rather than larger public areas.

CONNECTION DIAGRAMS

1.OPTICAL DETECTOR


2.IONISATION DETECTOR


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