Drives and Controls Magazine

Label detector is not easily fooled

01 January, 2001

Label detector is not easily fooled

Labels of differing thicknesses, and clear labels on opaque backing strips, can both be sensed reliably by a new label detector from Rechner Sensors. The KL sensor is a capacitive fork device which can detect whether there is a double layer of labels and is said to be unaffected by fluttering or uneven label materials.

The detector works, in effect, as two sensors, with a pair of measuring electrodes in the top plate of the fork, and a third electrode in the lower plate. This third electrode can be eliminated if the labels are passing over a flat conductive surface. The gap between the plates can be adjusted up to 20mm.

To commission the detector, a sample is placed in the measuring area, and a potentiometer is adjusted using a simple LED display. Counting rates up to 10m/s are possible and the repeatable accuracy is 0.1mm.