Microsonic LCA-2 - Manual (Page 39)

Parameter change in the web edge sensor bks+ Page 39 of 51
P ARAMETER CHANGE IN THE WEB EDGE SENSOR BKS +
The bks+ ultrasonic web 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 fork’s lower leg is equipped with an ultrasonic sensor which cyclically emits short sound impulses,
which are detected by the ultrasonic receiver arranged in the upper fork leg. Material immersing into the
fork covers this sound path and thus attenuates the receive signal in dependence of the coverage, which
is evaluated by the internal electronics. An analogue signal is output in dependence of the coverage
degree.