OTT HydroMet

- Model LUFFT VS2k - Visibility Sensor



New product version of the known LUFFT VS20 visibility sensor with a measurement range of 10 ... 2000m, easy calibration functionality, sea waterproof housing and (active) spider defence. The VS2k visibility sensor measures visibility up to 2000m, ideal for road traffic applications on motorways, highways or bridges. A calibration device is available (optional).

The VS2k-UMB is configured via the software UMB Config Tool:

  • Reading / Changing of the current configuration,
  • calibration,
  • polling of the current measurement values,
  • the software allows configurations to be loaded and stored.

The measurement data is available for further processing in the form of a standard protocol (Lufft UMB protocol or SDI12).

ASD = Active Spider Defense: The built-in vibrating motor ensures at irregular intervals that the VS2k visibility sensor is not so prone to spiders. The construction of VS2k also reduces the frequency of maintenance.

  • Parameters measured: Visibility (measuring range 10 ... 2000 m)
  • Measurement technology: 45° forward light scattering
  • Product highlights: suitable for extreme ambient conditions, active spider defence, seawater resistant, compatible interfaces
  • Interfaces: SDI-12, RS-485, analogue output

  • First and only visibility sensor with active spider defense
  • Measurment range of 10 … 2000m, ideal for traffic applications
  • Easy and smart calibration thanks to a calibration kit (optional)
  • Forward light scattering technique
  • Long life time thanks to sea waterproof housing
  • Open and free to use communication protocol for easy integration in excisting systems

The robust and sea water proved visibility sensor is designed for professional meteorological applications in all climate zones, onshore as well as offshore. It delivers reliable data, even in extreme ambient conditions.

Examples of Use:

  • Weather observation for road and traffic control systems
  • Weather stations at airports, marinas and onboard ships
  • Wind turbine control


  • Storage conditions:
  • Admissible storage temperature: -40...70°C
  • Operating rel. humidity: 0...100% RH (non condensing), 0...98% (inside packaging)
  • Operating conditions:
  • Operating temperature: -40...60°C
  • Operating rel. humidity: 0...100% RH
  • Power supply: 20...30VDC; typical 24VDC
  • Power consumption: < 200mA (motor running and current outputs active), about 100mA in normal mode and RS485 output
  • Power consumption: 3W (typical), 10W (max.)
  • Protection class: III (SELV)


  • Dimensions: 500x230x80mm
  • Weight: Approx. 4kg
  • Protection type: IP66
  • Value update: 1/minute
  • Included in delivery: Connection cable
  • Cable length: 10m


  • Principle: 45° forward scattering
  • Measuring range: 10 ... 2000 m
  • Unit: m
  • Accuracy: ±10 m or ±10 %, highest value applies

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