Three light types in a compact housing
Every application has different requirements on the sensor system with respect to reliable contrast marker detection. Because the emitted light color determines the reliability with which contrast markers are detected, the new KRT 3C contrast sensors use three different light types. This allows customers to select the appropriate light source for each type of material and for each contrast marker color in packaging or labeling processes.

Multicolor uses red, green or blue LED light (RGB). Through the automatic selection of the right transmitter color, various color or gray value combinations can be reliably detected. Multicolor devices are especially well suited for very colorfully printed films.

The white light LED is used if it is necessary to distinguish colors and gray values from a reference gray value (with equal contrast resolution). This provides greater reliability particularly in the case of contrast markers on glossy surfaces.

Contrast sensors with a red light laser emit a very small laser light spot and are therefore the ideal choice for detecting very small markers and changes in distance.