The bks ultrasonic edge sensor
is a fork sensor for scanning the edges of sound-impermeable materials such as foil or paper.
This is why the bks is ideally suited for the web control of highly transparent foils, light-sensitive materials, materials with greatly varying transparency and paper subject to high paper dust loads.
The functional principle
The fork’s lower leg is equipped with an ultrasonic transmitter which cyclically emits short sound impulses, which are detected by the ultrasonic receiver arranged in the upper fork leg. Material passing through the fork covers this sound path and thus attenuates the receiving signal depending on the coverage, which is evaluated by the internal electronics. An analogue signal is output in dependence of the coverage degree.
|The analogue output can both deliver voltage 0–10 V as well as current 4–20 mA.|
The operating range amounts to 8 mm (±4 mm).