Photoelectric sensors
W4S-3 Glass

Slim photoelectric sensors reliably detect transparent objects

Your Benefits

  • Optimal detection of any kind of transparent object
  • Quick and easy operation via the push of a button – automatic setting of the correct switching threshold
  • Less downtime due to a Continuous Threshold Adaption which compensates for changing environmental conditions, including temperature, dust and drift effects
  • The well-defined, highly visible intense light spot provides quick and reliable alignment
  • IO-Link provides easy data access from the PLC
  • Quick and easy configuration
  • Quick and easy integration using function blocks
  • Easy device replacement and identification


Slim photoelectric sensors reliably detect transparent objects

The WLG4S-3 is a retro-reflective sensor enclosed in a slim housing that reliably detects transparent objects. Even small gaps between objects, highly transparent thin films, and vials with flow marks and severe lens defects can be reliably detected. Setting the sensor requires a single press of the teach-in pushbutton. The sensor reliably adjusts for any changes to environmental conditions such as temperature, dust or dirt. The single-lens autocollimation system “sees” through even the smallest of openings. The PinPoint LED's small but intense light spot enables quick and easy alignment even when using the smallest reflectors. Plus, variants with IO-Link provide continuous diagnostics data.

At a glance
  • Continuous threshold adaption of the switching threshold compensates for environmental changes
  • Single-lens autocollimation optics
  • Simple setting either via teach-in pushbutton, cable or IO-Link
  • PinPoint LED technology with a small, highly visible, well-defined light spot enables high reserve levels when using small reflectors
  • Flexible sensor settings, monitoring, advanced diagnostics, and visualization thanks to IO-Link

Technical overview

  • Technical data overview

    Technical data overview

    Dimensions (W x H x D)12.2 mm x 41.8 mm x 17.3 mm
    Light sourcePinPoint LED
    Type of lightVisible red light
    Enclosure ratingIP67, IP66
    Housing materialPlastic
    AdjustmentTeach-in button / cable / Teach-in button
All technical data can be found accompanying the individual product