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Photoelectric switches with protective housings

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article image Long operating ranges with large functional reserves and rapid commissioning.
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SICK has released the W 27-3 Ex series of photoelectric switches for object detection in Zone 2 (gas) and Zone 22 (non-conductive dusts) Ex-zones. The sensor and its metal protective housing comply with Categories 3G and 3D of the 94/9/EU (ATEX) directive.

Both switches in the series offer long operating ranges with large functional reserves and rapid commissioning. This is made possible by an intensive red-light transmission LED. The WL 27-3Ex photoelectric reflex switch offers an operating range of 0.1m-11m. The WSE 27-3Ex through-beam system can be used over distances of 0m-25m. Whether on the reflector or the receiver, alignment of both devices is considerably simpler with the new transmission LED and the bright light spot it generates.

The WTB 27-3Ex photoelectric proximity switch is available for applications in which an object requires direct detection and reliable suppression of the scanning background is essential. The sensor offers scanning distances of 100mm-1600mm. Background suppression ensures that objects or pulses present directly behind the target object do not impair the reliable functioning of the proximity switch.

The W 27-3 Ex series is principally used on machines and plants in the potentially explosive Zone 2 (gas) or Zone 22 (non-conductive dusts) areas in, among other sectors, the chemical, pharmaceutical, petrochemical and paint industries, in mills or cement works, or wood processing plants. A range of automation tasks can be quickly, easily and reliably solved with the sensors thanks to their standard-compliant housing, standardised mechanical and electrical connector technology, and their rapid and simple alignment and parameterisation.

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