Sensors & Transducers


Light screen detects small parts

June 2003 Sensors & Transducers Products & Solutions

Banner Engineering is offering its new LX Series high-speed, high-resolution part sensing light screens. Each diode of the LX's unique electronics system becomes a part of up to 11 light beams to generate a nearly solid crosshatch pattern and achieve detection of extraordinarily small objects of just 0,6 mm. The LX also features response times as short as 0,8 ms, making it suitable for applications where high-speed miniature object detection is required.

"Users are looking for three major capabilities in an object sensing light screen; multiple sensor lengths, faster response speeds and increased ranges for similar detection sizes," said Mike Dean, product director for Banner's Measurement and Inspection Products Division. The LX is available in 75, 150 and 300 mm lengths, they feature an aluminium housing with a convenient T-slot for mounting flexibility and are setting the industry standard for high-performance object detection light screens. Users can choose from short or standard range light screen pairs depending on their application requirements.

Compact size, high sensing speed, rugged construction and high resolution make the LX a useful sensor for part ejection and conveying applications. As ejected objects pass through the sensing beams, the sensor's outputs relay to the machine that it may proceed to the next cycle. This verification process protects costly metal stamping dies from damage due to stuck or jammed stamped pieces which have not registered as having cleared the process.

The new system is easy to set up and simple to use with correct sensor alignment clearly indicated via status LEDs. Variable sensor height, convenient bracket options and long-range sensing capabilities of the LX also make it well suited for conveyor applications where the sensor is looking for the leading edge of objects varying in height, but occurring at similar intervals within a given range. This includes parcel handling and flat finding of envelopes or flat parcels in a conveyed application.

The 10 to 30 V d.c. LX Series opposed-mode sensing light screens have a maximum output rating of 150 mA. Models come with bipolar NPN and PNP outputs. The compact but rugged sensors tolerate vibration, mechanical shock and washdown. Internal circuitry guards against false pulse on power-up, continuous overload, and short circuit of outputs.



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