Retroreflective photoelectric sensors have the transmitter and receiver in one unit. The retroflective photoelectric then uses a reflector to bounce the light back to the transmitter.
The object is sensed when the beam is interrupted and fails to reach the receiver. A retro-reflective photoelectric sensor has a much longer sensing distance than a diffuse type.
You also may have heard the terms light switching and dark switching. In light switching the output of the sensor turns on when the object is not present, in dark switching the output of the sensor turns on when the object is present.
Marshall Wolf Automation is your industrial automation distributor for retroreflective photoelectric sensors! We carry Pepperl + Fuchs, SUNX, IDEC, Carlo Gavazzi sensors, TAKEX and Datasensor!
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