Fibre-optic light barriers

Our fibre-optic light barriers are used whenever object recognition is to take place in areas which are characterized by high operating temperatures, exposure to dust, moisture, pollution, sparks or the like, or which are difficult to access.

If you are not satisfied with “off-the-shelf” products, you have come to the right place: with fibre optic lengths of up to 25 m and ranges of over 20 m, even extreme requirements can be met.

Fibre-optic light barriers usually consist of a reflective light sensor (EFS series or FSP60 series) and a 2-arms fibre optic cable: one for the transmitting and one for the receiving side.

Sensor is placed in a non-exposed area and the light signal is guided to the measuring point and back via fibre optic. The ends of the fibre optic are positioned to each other in a way to form an optical barrier: if the object to be recognized is absent, it is closed, that means the light emitted by the sensor is sent back to the sensor; if the object gets into the light ray, optical barrier is interrupted and a switching operation is triggered.

Depending on the environmental conditions, fibre optics can be supplied with different protective tubes and are available with axial (straight) or radial (angled) light emission.

Thanks to the aperture angle of the fibres, fibre optic light barriers are very tolerant to lateral misalignment and can therefore be very easily set up.

• contactless
• ranges up to over 20 m
• fibre optic lengths up to 25 m
• particular robustness
• for temperatures up to 200 °C, special versions up to 400 °C
• also for ATEX environments

• Detection of slabs or similar in hot rolling mills
• Detection of parts in forging machines, cutting machines etc.
• Light barrier in ATEX environments