Loop sensors are used for the speed control of successive machines. In order to be able to hold the loop as constantly as possible, often an on-off control is not sufficient. The sensor measures the loop of a wire or a hose and supplies proportionally to the position, a similar output signal for the variable-speed drive. Thus a constant loop is achieved.
The output supplies 0-20V similarly to the position of shading the receiver element of the CCD-loopsensor.
For the position signal the upper edge of the wire is determining. For creating a homogenius light the transmitter is equipped with frequency driven, flourescent lamp.