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Miniature photoelectric switches open up new possibilities in the smallest of spaces
Waldkirch, April 2006 – Those considering miniature sensors want powerful automation solutions in the smallest of spaces. The W2 and W4-3 series, impor-tant technology trend-setters in their segments, are real high-tech space phe-nomena for numerous applications.

Whether as a matchstick-thin slim version or as flat as a pancake – the W2 is among the smallest series of opto-sensors for industrial uses. The W4-3 in “sugar cube” design impresses through its numerous new technologies and its fieldbus capability via IO Link.

W2: precise positioning, transparent scanning

Whether particularly narrow or extremely flat – the W2 series, with its through-beam and photoelectric reflex switches and proximity switches, offers the right housing for every mounting situation. While the photoelectric switches have long ranges and high performance reserves, the laser-like light spot ensures that the photoelectric proximity switches with background suppression offer maximum precision and resistance to in-terference, e.g. during circuit board detection or the positioning of handling systems. Thanks to their V-optics, the energetic scanners are particularly suitable for the detec-tion of transparent and reflective objects, e.g. test tubes in automatic analysers. In ad-dition, the “slim” and “flat” versions reliably fulfil users’ high EMC, impact and vibration immunity demands.

W4-3: series with best-in-class scanner

With the through-beam and reflex photoelectric switches, and the best-in-class pho-toelectric proximity switch, the W4-3 series also offers suitable alternative solutions with interesting performance data. The photoelectric switches are capable of reliably de-tecting small objects even over ranges of up to 4 m. Several new technologies make the WT4-3 photoelectric proximity switch the benchmark in its market segment. A new sensor chip allows not only electronic scanning distance adjustment and background suppression, but also fieldbus connection of the sensor via IO Link. Even jet black ob-jects are reliably detected, thanks to pin-point LEDs. Moreover, they prevent spill-over reflections and thus ensure high repeatability. Furthermore, the optics are specially coated so that ambient and “third-party” light is reliably filtered out. The poured cable fittings offer maximum robustness and tightness – providing an enclosure rating of IP 69K. That the WT4-3 can deservedly be described as “top of its class” has been shown by a range of tests against devices available on the market. Under all test conditions, the high-tech scanner achieved top values, both in the suppression of reflective back-grounds and in the suppression of active and passive sources of interference.

With increasingly compact machines and plant, e.g. in the electronics industry, in han-dling and robotics, or in pharmaceuticals and the analytical segment, the demands made of the relevant sensors are growing. Long ranges or reading distances, reliable object detection even under harsh operating conditions or with critical surfaces, flexible mounting options, standardised electrical connection technology and simple operation (particularly in the installed state) are important requirements entirely met by the W2 and W4-3 series.