Proximity sensors avoid "invisible pallet" problem

Pepperl+Fuchs' RL29-55V sensor uses foreground suppression to filter out false reflections when the reflecting target is too close to the sensor.

Pepperl+Fuchs has developed the RL29-55V sensor for the conveyor and warehousing industries.

It is specifically designed to overcome the problems caused by shrink wrapped pallets.

Conventional reflective sensors detect the presence of a pallet when the beam (reflected by a prismatic reflector on the other side of the conveyor) is broken.

However, when shrink wrap is used it can sometimes simulate the effect of a reflector and make the pallet temporarily "invisible" to the sensor.

The new sensor uses foreground suppression to filter out false reflections when the reflecting target is too close to the sensor.

This allows the sensor to differentiate between a false signal reflected from the shrink wrap on the pallet and the real signal from the reflector.

The sensor range also features ultra bright indication LEDs for easy installation and maintenance.

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