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Proximity PE
Background (BGS)
Retro-reflective
Through-beam

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Photoelectric sensors are used to detect objects by breaking a light beam (Retro-reflective or Through-beam) or by detecting the reflected light (Photoelectric Proximity sensors) from the target object.   When an object is detected, these sensors respond by activating their output, and are available in cylindrical and rectangular packages.

	Photoelectric Proximity Sensors  Also called Diffuse or Reflective sensors since they respond to diffuse light reflected directly from the target object.
	Proximity Sensors with Background Suppression (BGS)  Proximity sensors with background suppression are designed to detect a target object yet ignore other background objects.
	Retro-Reflective (Reflex) Sensors These sensors activate their output when the target object breaks the light beam from the reflector (mirror), and they have longer sensing ranges than the Proximity PE sensors.
	Through-beam Sensors These sensors use separate transmitters and receivers.  The target object breaking the light beam activates the output.  While wiring is more complex because the transmitter (sender) and receiver are separated, they are able to cover much longer distances than Proximity PE or Reflex Sensors.

• For small object detection, refer to the Fiber-Optic section

• For analog outputs see the Analog or Distance sections

• For detecting objects of varying shapes and dimensions, see the Multi-beam section

• For registration mark detection, see the Color & Contrast section.

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