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The modes of operation photoelectric sensor XUB series

The Photoelectric sensor XUB series have 3 modes



Thru beam: 
A through beam arrangement consists of a receiver located within the line-of-sight of the transmitter. In this mode, an object is detected when the light beam is blocked from getting to the receiver from the transmitter. 
So in this if any object comes in between the receiver and transmitter then the contact of the output changes. 
In the case of NO type output when any object is present between the receiver and transmitter then the output contact is closed and output is ON. 
In the case of NC type output when any object is not present between the receiver and transmitter then the output contact is closed and output is ON. and if any object is present 
between the receiver and transmitter then the output gets OFF. 

Retroreflective: 
A retroreflective arrangement places the transmitter and receiver at the same location and uses a reflector to bounce the light beam back from the transmitter to the receiver. An object is sensed when the beam is interrupted and fails to reach the receiver. 
This also work same as that of Thru Beam sensor. 

Diffuse mode: 
A proximity-sensing (diffused) arrangement is one in which the transmitted radiation must reflect off the object in order to reach the receiver. in this case the emitted raise are transmitted back from the object. 
Here in this case object act as a receiver so if the object is present in the line of sight of the sensor then the output contact changes. 
In case of NO type output if object is not present output is OFF and if output is present then the output is ON 
In case of NC type output if object is not present output is ON and if output is present then the output is OFF. 
In the diffuse mode and retroreflective mode the sensor act both as transmitter and receiver. 
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