Light barriers

The retro-reflective light barrier combines transmitter and receiver in one housing.The light emitted by the transmitter is reflected by a reflector.The receiver evaluates the reflected light.The small size of the reflector is advantageous.
In addition, it is easy to install being a passive element, thus not requiring connection.

Transmitter and receiver of through-beam sensors are separate. This means that the emitted light has to travel the distance between transmitter and receiver only once. Therefore they are called through-beam sensors.These types can reach very large scanning ranges.