Fiber-optic sensors

Your Benefits

  • Reliable, rapid process detection, even under the most difficult ambient conditions, such as dust, spray or mist
  • Easy commissioning and product changeover due to external teach-in
  • Cross-talk is eliminated when utilizing bus configuration option
  • Quick, easy setup and adjustment due to an intuitive operating menu
  • Flexible parameter adjustment due to high-resolution signal processing. Hysteresis and time delays can be adapted to suit the application, e.g., when detecting tiny or transparent objects
  • Easy-to-read display, even under difficult installation conditions


The WLL180T fiber-optic photoelectric sensor family provides the world’s fastest response time - only 16 μs. In addition, it offers superior sensing distances of up to 20 m and its high light intensity delivers a reliable, high-powered solution – even in difficult ambient conditions, like dust, spray, mist, and water jets. Commissioning is simple – either via the external teach-in input or directly on the unit. Two, four-digit displays provide visualization of all programming steps, status displays, plus target and actual values through an intuitive menu structure. The WLL180T sensors can be operated either as a stand-alone or in a bus configuration, depending on the requirements. In a bus configuration, several sensors are networked via an internal bus, enabling the settings on one WLL180T to be copied to all other devices on the bus. Fiber-optic amplifier cross-talk is prevented by the sensors’ integrated anti-interference logic.

At a glance
  • Selectable response time up to 16 µs
  • Sensing range up to 20 m (through-beam system); up to 1,400 mm (proximity system)
  • Bus-compatible with anti-interference
  • 2 x 4-digit digital display
  • Adjustable hysteresis
  • Rotatable display screen
  • High-resolution signal processing
  • Programmable time delays


Technical overview

  • Technical data overview

    Technical data overview

    Dimensions (W x H x D)10.5 mm x 34.6 mm x 71.9 mm
    Sensing range max.

    0 m ... 20 m, Through-beam system 1) 2)

    0 mm ... 1,000 mm, Through-beam system 1) 3)

    0 m ... 6 m, Through-beam system 2) 4)

    Light sourceLED
    Type of lightVisible red light / Infrared light
    Enclosure ratingIP50 5)
    Housing materialPlastic ABS/PC


    Single teach-in button


    • 1) Sensing range with 8 ms response time. Reduction with shorter response time (see tables LL3/WLL180T).
    • 2) LL3-TX01.
    • 3) LL3-TW01.
    • 4) Sensing range with 200 ms response time. Reduction with shorter response time (see tables LL3/WLL180T).
    • 5) With correctly attached fibre-optic cable LL3 and closed protection hood.
All technical data can be found accompanying the individual product