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Photoelectric Proximity Switches or sensors are primarily used when the object to be is metallic or nonmetallic.Photoelectric sensors are three different types.These are available here:

1. Diffused type photo electri proximity switch.
2. Through beam type proximity switch.
3. Retrorefrective  type proximity switch.

Photoelectric proximity switches is sought for reliable detection of objects within a defined scanning range on a conveyor system. Objects, which reduce distance from scanning plane to sensor, are detected. Scanning range / switching point can be set by adjusting sensitivity.
Working Principal 
1- Diffused Types: 
These types of proximity switch of contned emitter and reciever in one unit.When the emitter emites the infrared signal which is reflected from the surface of the object to be detected and receiver and this will changed the output stage . 
2- Through Beam Type:
These types of proximity switch of contned seperate emitter and reciever in one unit . When the emitter emites the infrared signal and continously received by the receiver .When an object comes in between the emitter and receiver the siganal
3- Retroeflective Type:
These types of proximity switch of contned seperate emitter and reciever in one unit .And a reflector is used to reflect the zero diffused beam. When an object comes in between these two the beam is broken and the output will changed its signal photoelectric proximity switches are used to counting on Conveyor Belts , Webtewar , Monitoring , Sensing the end of a Roll etc.