Photoelectric sensors
W4S-3 Inox

Your Benefits

  • Long service life in harsh conditions ensures less downtime and fewer replacement costs
  • Quick and easy alignment due to highly visible PinPoint emitter LED
  • Easy adjustment via a stainless steel metal membrane teach-in pushbutton
  • 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


The W4S-3 INOX product family in WashDown design combines rugged watertight IP 69K stainless steel housing with "best-in-class" optical functionality.

These space-saving miniature sensors are able to withstand the most aggressive cleaning agents and disinfectants thanks to a membrane teach-in button that is 100% watertight and pin-cast M12 connections. They can be relied upon for long-term service in critical applications in the food and beverage, pharmaceutical, solar, and electronics industries.

At a glance
  • WashDown rated for fluid tightness (IP 66, IP 67, IP 68 and IP 69K) and Ecolab certified
  • Tough stainless steel housing (316L/1.4404)
  • 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 44.5 mm x 22.2 mm

    15.25 mm x 48.6 mm x 22.2 mm

    15.25 mm x 49.2 mm x 22.2 mm

    15.25 mm x 44.9 mm x 22.2 mm

    15.3 mm x 55.4 mm x 22.2 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

    Light sourcePinPoint LED / LED
    Type of lightVisible red light
    Enclosure rating




    IP69K 3)


    Housing material

    Stainless steel Stainless steel V4A (1.4404, 316L)

    Stainless steel AISI 316 L, SiOx


    Cable 4)

    Single teach-in button


    Single teach-in button 4)


    • 1) Object with 90 % reflectance (referred to standard white, DIN 5033).
    • 2) Reflector PL80A.
    • 3) Only in case of correctly mounted IP69K connecting cable.
    • 4) 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