Photoelectric sensors
W4S-3 Inox Hygiene

Your Benefits

  • Smooth hygienic housing and accessories with no grooves or crevices eliminates the potential for bacteria to grow, providing a more hygienic solution.
  • Long service life in harsh conditions ensures less downtime and fewer replacement costs
  • Easy adjustment via a stainless steel metal membrane teach-in pushbutton
  • Quick and easy alignment due to highly visible PinPoint emitter LED
  • IO-Link provides easy data access from the PLC
  • Quick and easy configuration
  • Quick and easy integration using function blocks


The W4S-3 Inox Hygiene series of photoelectric sensors combines hygienic requirements based on EHEDG with best-in-class performance. These sensors are completely enclosed in a stainless steel housing and can be taught via a stainless steel teach button with a metal membrane. With built in protection for the sensor cable, no additional mounting brackets or mounting holes are required for in-process machine integration. These sensors are designed for a completely hygienic sensor solution that is a necessity for the most hygienic machines.

At a glance
  • Smooth stainless steel housing (316L/1.4404)
  • Hygienic mounting using M12-adapter thread or D12-adapter shaft
  • IP 66, IP 67, IP 68 and IP 69K enclosure rating and Ecolab certified
  • Resistant to a variety of common cleaning and disinfection agents
  • Highly visible laser-like light spot due to PinPoint LED
  • Teach-in via stainless steel pushbutton with a metal membrane
  • 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)

    15.25 mm x 48.6 mm x 22.15 mm

    15.25 mm x 63.2 mm x 22.15 mm

    15.3 mm x 48.5 mm x 22.3 mm

    Sensing range max.

    4 mm ... 500 mm 1)

    4 mm ... 180 mm 1)

    4 mm ... 120 mm 1)

    4 mm ... 280 mm 1)

    20 mm ... 200 mm 1)

    0 m ... 4 m 2)

    0 m ... 5 m 2)

    0 m ... 5 m

    0 m ... 1.5 m

    Light sourcePinPoint LED
    Type of lightVisible red light
    Enclosure rating





    Housing materialStainless steel Stainless steel V4A (1.4404, 316L)

    Cable 3)

    Single teach-in button




    • 1) Object with 90 % reflectance (referred to standard white, DIN 5033).
    • 2) Reflector PL80A.
    • 3) External teach-in: pulse > 2 s with voltage Uv with PNP and M with NPN.
All technical data can be found accompanying the individual product