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HLG: the high-resolution light curtain for detecting flat objects in rapid motion
Waldkirch, April 2007 The new HLG high-resolution light curtain from SICK is the ideal solution for all applications in which letters, small bags of baking powder, instant salad dressing in portioned bags, or other flat objects on a conveyor belt require reliable detection. This has been made possible by its constant resolution of 2 mm over the entire detection range, a very low switching hysteresis, and the fastest response time currently available from such systems just 3 ms. With these properties, the HLG offers perfect detection solutions, e.g. in rapid mail-sorting systems, in packaging machines with high throughput rates, for counting small parts or for checking rejections.

The HLG high-resolution light curtain offers a fixed detection height of maximum 50 mm. 26 transmission or reception elements are accommodated in each of the two robust IP65 metal housings. The teach-in of objects (supported by three indicator LEDs), and the synchronisation of transmitter and receiver via cable, ensure rapid commissioning and maximum stability of the taught-in switching threshold.

Small gaps are sufficient for single object detection


Thanks to the extremely short response time, objects can be located close together on the conveyor belt in the goods distribution centre. The HLG provides reliable detection of front edges at a transport speed of 120 m/min even with the smallest of gaps of just a few millimetres between the individual objects. The switching signal can optionally be provided via NPN or PNP.

Minimum power uptake


The HLG can properly be described as a power-saver. With just 100 mA for 26 beams it also sets the standard for energy and operating costs an argument that becomes increasingly important with the number of systems involved in a complete project.