Reflex light barrier functions without a reflector
October 2017
Sensors & Transducers
Wenglor has introduced its latest optical reflex light barrier which functions without a reflector. By simply pressing a key, the barrier detects any object located between itself and any defined background.
The new device allows for reliable detection of objects at distances of up to 500 mm without a reflector. The unique functional principle is based on an evaluation of signal strength and angle measurement and requires nothing more than a background as reference. By doing away with reflectors, the reflex light barriers require less space and can be more flexibly integrated into the system layout. Other benefits include reduced costs and faster initial startup because fewer components have to be installed and serviced.
In addition, the device offers an intelligent function for dynamic readjustment of the switching threshold and offsets external influences such as contamination and temperature fluctuation, ensuring lasting precise switching performance and less idle time.
Visible red light makes the sensors easy to align and they can be set up for the respective application by simply pressing the teach-in key.
The high precision measuring process of the reflex light barrier even provides for detection of transparent objects made of glass, PET and sheet materials. For example, it can check for the presence of transparent sheet materials and trays in packaging processes and reliably detects all types of objects on conveyor belts. In the beverage industry the device monitors the presence of bottles uninterrupted throughout the lifecycle from manufacture of the bottle and filling, through to the machines for the return of bottles for the refundable deposit.
The reflex light barrier can be used in harsh environments and has IP67 protection. Temperature range operation is from -40 to +60ºC.
For more information contact Anastas Schnippenkotter, ASSTech Process Electronics & Instrumentation, +27 (0)11 708 9200, [email protected], www.asstech.co.za
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