Visual range measuring devices

About visual range measuring devices

Visual range measuring devices determine the range of visibility on roads, sea routes, and at weather stations. They also measure visibility inside tunnels. Visual range measuring devices are able to detect fog reliably because they can distinguish it effectively from foliage and other parts of plants located in the optical path of the beam as well as from dirt on the lens. With their rugged housing and long maintenance intervals, these measuring devices are ideal for use outdoors.

Over 60 years of tunnel expertise – and setting its sight on the future

As the density of the traffic on our roads increases, the future is all about finding ways to increase the availability of tunnels while at the same time improving safety for road and tunnel users. For 60 years, we have been helping road and tunnel operators to take on this challenge, offering innovative products not only for measuring visibility and air quality in routine operation but also for air f low measurement and smoke detection in emergency situations.

Safe driving in tunnels - from start to finish 

Our portfolio of tunnel sensors is designed for urban tunnels, overland tunnels, and tunnels in rail and subway systems. Whether it be routine operation or emergency situations, we are your one-stop-shop for virtually all tunnel monitoring applications.

We measure:

• Air flow: velocity and direction 
• Air quality: carbon monoxide CO, nitrogen monoxide NO, nitrogen dioxide NO2
• Fog monitoring: visual range 
• Visibility: K value 
• Traffic safety: overheight detection 
• Early fire detection: smoke