Page 12 - Industrial Technology EXTRA 28th September 2020

the conveyor belt, it only needs to be intelligent teach level. There is, for example, a teach routine
enough to adapt this knowledge to a possible for conveyor belts that become heavily soiled over
change of environment. time. Another teach level exists especially for the
This is precisely what CAT technology does. detection of very flat or even transparent objects.
From transparent to high-gloss, the reference Once the sensor has been ‘taught’, no additional
technology enables the detection of packaging with settings or readjustments are necessary. Not even if
a wide range of colors and transparency as a the object is changed, as the sensor operates
"deviation" from the conveyor belt surface. together with the conveyor belt as a reference.
The DRT 25C works with the conveyor belt
Operating principle surface as a dynamic reference for the detection of
The new DRT 25C dynamic reference diffuse sensor objects. This is how the sensor reliably detects all
uses the CAT technology in a new operating objects that do not correspond to the belt surface,
principle: it learns the signal parameters of the even in the case of contamination and vibration of
conveyor belt at the press of a button and stores the conveyor belt.
them as the ‘standard zero’.
Every object that is transported on the conveyor Increasing throughput
belt now generates a signal. If this deviates from the If, for example, a chocolate bar is not reliably
zero state, the DRT 25C reliably detects the object detected, a failure quickly occurs in the subsequent,
as a ‘deviation from the reference’. The performance precisely cycled packaging, which must then first be
of the device is optimized through the choice of removed and cleaned. The more reliably the sensor

September 2020 • INDUSTRIAL TECHNOLOGY EXTRA • p12