Visual range measuring devices

Measurement of visual range for roads, tunnels, sea routes and in weather stations

Your Benefits

  • Reliable measured values
  • Low operating costs
  • Low maintenance requirements due to long maintenance intervals

The exact device specifications and performance data of the product may deviate from the information provided here, and depend on the application in which the product is being used and the relevant customer specifications.


Measurement of visual range for roads, tunnels, sea routes and in weather stations

The VISIC620 determines the standard visual range on roads, sea routes, or in weather observation stations or measures the visibility (as k-value or in mg/m³) in tunnels. An automated self-test measures and compensates for possible front screen contamination. Furthermore, it offers excellent recognition of objects such as leaves or plants in the optical path. Therefore, the VISIC620 can measure fog reliably.

The maintenance interval of five years (except cleaning), the rugged stainless-steel housing and the possibility of power supply via solar cells or battery make the VISIC620 a real outdoor product, even in salty air.

At a glance
  • Large measuring range for visual range
  • Precipitation detector as an option
  • Contamination check
  • Minimum space requirements and low weight
  • Self-sufficient design possible with solar panel and battery
  • Rugged housing, also for salty air

Spare parts


Service & Support

Technical overview

  • VISIC620 system

    VISIC620 system

    Measured valuesStandard visual range, K-value
    Measurement principlesScattered light forward
    Spectral range
    640 nm ... 660 nm
    Laser, protection class 2, power < 1 mW
    Measuring ranges
    Standard visual range10 ... 500 m / 10 ... 16,000 m
    Output range freely adjustable
    Response time (t90)
    2 s ... 300 s
    ± 5 m
    For visual range below 50 m
    ± 10 %
    Of measured value for visual range below 5,000 m
    ± 20 %
    Of measured value for visual range below 16,000 m
    ± 2 %: for a visual range of 200 m
    Ambient temperature
    –30 °C ... +55 °C
    Storage temperature
    –40 °C ... +75 °C
    Ambient humidity
    0 % ... 100 %
    Electrical safetyCE
    Enclosure rating
    Analog outputs1 output:
    0 ... 20 mA
    Only VISIC620-1xxxx
    Digital outputs2 relay contacts:
    48 V AC, 35 W / 48 V DC, 24 W
    Only VISIC620-1xxxx
    Digital inputs1 potential-free contact:
    4 V, 4.5 mA
    Not with the VISIC620-1xxxx
    Serial✔ , ✔
    RemarkOnly VISIC620-2xxxx
    Type of fieldbus integrationRS-232
    FunctionProprietary service interface, connection to SOPAS ET software
    Proprietary service interface
    Dimensions (W x H x D)
    479 mm x 117 mm x 261 mm (for details see dimensional drawings)
    5.6 kg
    MaterialStainless steel 1.4571, powder-coated
    Power supply
    Voltage24 V DC, ± 10 %
    Power consumption≤ 10 W
    Test functionsAutomatic self-test (contamination, drift, LED, disturbing objects)
All technical data can be found accompanying the individual product