Fiber-optic sensors

Your Benefits

  • Reliable, rapid process detection
  • Low installation costs due to short commissioning time
  • Flexible teach-in modes allow the sensor to be customized according to the specific application
  • Emitted light ideal for color or contrast detection
  • Easy programming via simple potentiometer and switch adjustment


The WLL170-2 fiber-optic photoelectric sensor family features a standard operating system that is especially suitable for basic applications, but can be used when rapid response times are crucial. There are several variants. The WLL170(T) version is optimized for a number of key applications, such as detection of very small objects, colored marks, or transparent objects. The WLL170T-2 is a teach-in version where the switching threshold can be set either automatically by pressing a button or via a cable. In contrast, the WLL170-2 has a manual switching threshold adjustment via a potentiometer. Both models are available in a high-speed version with a switching frequency of 10 kHz for extremely fast response times. For optimum detection of color contrasts, you can choose between devices with a red or green LED emitter. Detection tasks are handled securely and reliably using the LL3 series of fiber-optic cables.

At a glance
  • Rapid response time (50 μs)
  • Switching threshold adjustment via potentiometer, or teach-in via button or cable
  • Four different teach-in modes
  • Simple installation
  • Red or green LED emitter

Technical overview

  • Technical data overview

    Technical data overview

    Dimensions (W x H x D)10.5 mm x 35.5 mm x 83.7 mm
    Sensing range max.0 mm ... 4,000 mm, Through-beam system 1)
    Light sourceLED
    Type of lightVisible red light / visible green light
    Enclosure ratingIP66 2)
    Housing material

    Plastic ABS/PC

    Plastic ABS


    Potentiometer, 10 turns

    Single teach-in button


    • 1) LL3-TB02 and tip adapter LL3-TA01.
    • 2) With correctly attached fibre-optic cable LL3 and closed protection hood.
All technical data can be found accompanying the individual product