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This is a system which consist of one device and a reflector. The device contains emitter and receiver. The rays emitted by the emitter are reflected by the reflector to the receiver. The sensing of the object occurs when these rays are interrupted.
– Easy assembly compared to the through beam type.
– Large active sensing range compared to diffused beam type.
This sensor can be used where it is difficult to install Through Beam Semsor due to space constraint. Further, simple wiring makes it sutaible where sensing objects are bigger in size. Thus These sensors are used for loop control in decoiller, edge detection in paper / sheet metal etc.
As every object has some reflectivity, in Retre-reflective sensor object wil not be sensed if it is passed nearer to sensor. In this portion sensor remains inactive which is known as Dead Zone. Hence, it is recommended to move the object nearer to reflector [ i.e. away from the sensor ] as much as possible.
Generally, the effective sensing zone for an object is 30 to 100% away from sensor. Also, you can reduce the dead zone by gain adjustment facility provided on sensor, but it will also reduce the nominal sensing distance [Sn].
Example :
RBI – 3 K – P – O
Retro – Reflective Sensor,
Sensing range 3 Mtrs,
PNP, Normally open.