Product Details Supplier Info More products
Download document:

Leuze Electronic Sensor solutions - .PDF file.

Beumer Maschinenfabrik’s tray sortation systems, used in parcel handling, airports or book and CD/DVD logistics centres, utilise PRK 25B retro-reflective photoelectric sensors from Leuze Electronic.

The high-speed sorters use a conveyor running at more than 2m/sec to carry a letter lying in a tray, for example.

A control system tracks the tray and the letter until it reaches the correct output portal, where the tray sorter (or tilt tray) deposits the letter sideways onto the target chute.

Beumer uses four sensors mounted side by side above the conveyor to check if each tray is occupied, even by small goods down to a minimum volume of 50 x 50mm.

Detecting small items can be a challenge; the speed of the conveyor means that small objects interrupt the light beam of the sensors only for a very short time – around three tenths of a second.

The sensors target reflective strips that are integrated into the tilt trays, but these present another challenge because they are covered with Perspex for their protection.

In selection trials, Beumer tested sensors and reflectors from various suppliers with Perspex sheet, which was scratched with sandpaper to simulate wear.

Leuze’s PRK 25B performed well in these trials because of its high-performance reserve.

The sensors face another challenge because there is a pattern of ridges on the tilt tray that are needed to prevent the static charging of goods wrapped in plastic film, which might, in turn, cause the item to adhere to the tray and not tip into the correct output chute.

The size of the light spot projected by the sensor and its high power prevent unintended switching, which overcomes the challenge of these ridges.

Additional features such as Brightvision are designed to make Leuze’s sensors easier and faster to align.

This is said to be especially important to Beumer because the sortation system, depending on its size, can use several hundred sensors.

Leuze Electronic

Leuze electronic the ‘sensor people’ are committed to being the supplier of choice by providing the best customer service and products.

Leuze electronic the ‘sensor people’ are committed to being the supplier of choice by providing the best customer service and products.

DETECTIONOptical Sensors: An innovative range from economic standard sensors to feature-rich special solutions.

Barcode, 2D and RFID code readers; Smart cameras and Vision systems; Optical data transmission; Optical positioning.

PROTECTION – Machine safety light curtains and barriers; Safety laser scanners; Door and entry interlocks and switches.
Leuze electronic also offer a machine Safety Inspection Service to ensure the correct guarding of machines using any brand of safety light curtains & barriers.

Virtual online catalogues, industry specific brochures, and extensive guidance on machine safety are all available on our website.
Please call and talk to ‘the sensor people’ for technical information, samples and advice.

View full profile