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Contact SupplierPhotoelectric Switch works on the principle of modulated Infra-Red rays. These photoelectric beam sensors can sense any opaque, semi-transparent objects which comes in its sensing range. Proximity Photoelectric Switches have large operating distance. Photoelectric beam sensors are mainly divided into : Diffused Beam Sensors, Through Beam Sensors with Amplifier Unit, Through Beam Sensors with Built in Amplifier, Retro-Reflective Sensors.