Sensors & Transducers


Sensor for low contrast applications

August 2003 Sensors & Transducers

Banner Engineering Corp is offering the Expert microprocessor-based versions of its WORLD-BEAM photoelectric sensor. This sensor easily solves difficult applications with an advanced microprocessor that differentiates between two received light levels for the most precise sensitivity adjustment. It offers increased reliability for sensing transparent materials, and is ideal for tough sensing applications such as colour mark detection on a continuous web and sensing clear bottles or wafer cassettes on a moving conveyor. In TEACH mode, the WORLD-BEAM Expert can 'learn' the light and dark conditions required and determine the most accurate setting for recognising those conditions.

Especially significant is the size and price of the WORLD-BEAM Expert versus similar high-performance sensors. It measures a mere 35 mm x 15 mm x 31 mm.

Simple, push-button TEACH programming is accomplished by pushing the button once with the sensor pointed at the target and once with it pointed at the background. The sensor's microprocessor recognises low-contrast conditions and expands its sensitivity range before computing the optimal setting for differentiating between the received light signals.

Expert sensor is available in sensing modes to solve most applications, including 3,5 m range polarised retroreflective, 16 mm or 43 mm convergent beam and infrared beam, diffuse models with 800 mm, 500 mm or 300 mm range.

This sensor assures greater security for application settings because it uses a single, sealed button for programming, including lock-out capability to prevent tampering. For maximum efficiency and convenience, one or more sensors can be programmed from an external switch or PLC, via a remote TEACH wire.

360° visible LEDs protrude above the top of the sensor giving users visibility from the top and all sides. It has LEDs to indicate Power On and Output Conducting. They also flash to warn of problems, including marginal excess gain or output overload. The unit operates from 10 to 30 V d.c. and includes reverse polarity and transient voltage protection. It is rated IEC IP67 and NEMA 6. Users can choose models with a 2 m 5-conductor PVC cable, a 9 m PVC cable, or a 15 cm pigtail, 4-pin Pico - or Euro-style quick disconnect.

For more information contact, Rodney Topham, RET Automation Controls, 011 453 2468, info@retauto.co.za, www.retauto.co.za



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