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Key features


  • Measuring wind direction and speed insusceptibly to bird nesting thanks to roofed construction
  • Built-in data pre-processing, universal interfaces and selectable output protocols – compatible with OTT-dataloggers, commercially available HydroMet dataloggers and PLS systems
  • Maintenance-free operation – no moving parts that can wear out thanks to ultrasonic measuring method; no need for re-calibration
  • Suitable for all climate zones; also for solar-powered automatic meteorological stations
  • Integrated heater that can be switched on if there is danger of frost – guarantees ice-free operation in extremely low temperatures until -40 °C
  • Vibration and seawater resistant – also applicable in coastal regions
  • Successfully tested and certified in extreme ambient conditions (temperature, air humidity, electromagnetic compatibility, vibration, salt spray, and icing)
  • Embedded algorithms that provide the wind speed and direction as actual and averaged values
  • Wind gust calculation regarding WMO


The accurate wind sensor uses the run-time differential method for determining the wind speed and wind direction. It provides output for instantaneous values, vector and scalar means, the maximum gust of wind and wind direction, the maximum/minimum values and the virtual temperature.

Data output through serial or analogue interfaces makes the Lufft Ventus compatible with commercially-available hydrometeorological data loggers and PLC systems. An automatic heater ensures reliable operation even in harsh environmental conditions.

Lufft VENTUS-UMB Ultrasonic Wind & Direction Sensor

Excluding VAT
  • General

    Dimensions Ø approx. 150 mm, height approx. 170 mm
    Weight Approx. 1.62 kg
    Permissible ambient temperature -40...60 °C
    with heating 24 VDC / 240 VA (140 VA + 100 VA)
    Bus operation Up to 32 devices
    Operating voltage electronics 12 - 24 VDC / 1.9 VA, without heating
    Electrical connection 8 pole plug
    Housing material Aluminium, seawater - proof
    Protection type IP68
    Pole diameter 50 mm/2"
    Factory certificate Yes

    Data output digital

    Interface RS485 semi-/full duplex, isolated
    Baud rate 1200 - 57600
    Measurement rate instantaneous value 250 ms; 1 - 10 s
    Measurement rate Avg (arithmetic, vector), Min, Max 1...10 min
    Status Heating, sensor failure

    Data output analogue

    Data output analog Only semi - duplex mode
    Output signal 0...20 mA, 4...20 mA, 0...10 V, 2...10 V, 2...2,000 frequency (instantaneous, avg, min, max)
    Load Max. 500 Ohm
    Resolution 16 bit
    Jarring test According to IEC 60945
    Corrosion test According to MIL-STD-810 Method 509.3
    Ice-free test According to MIL-STD-810F Method 521.2
    HALT Highly Accelerated Life Test
    Maximum operating height 3500 m

    Wind direction

    Principle Ultrasonic
    Measuring range 0...359.9 °
    Unit °
    Accuracy ±2° RMSE >1.0 m/s
    Resolution 0.1 °

    Wind speed

    Principle Ultrasonic
    Measuring range 0...90 m/s
    Unit m/s
    Accuracy ±0.2 m/s or ±2 % RMS of reading (whichever is greater) for 0...65 m/s - otherwise ±5 %
    Resolution 0.1 m/s

    Virtual temperature

    Principle Ultrasonic
    Measuring range -50...70 °C
    Unit °C
    Accuracy ±2.0 °C (without heater and without sun exposure or wind > 4 m/s)
    Resolution 0.1 °C

    Air pressure

    Principle MEMS capacitive
    Measuring range 300...1200 hPa
    Unit hPa
    Accuracy ±1.5 hPa
    Resolution 0.1 hPa
  • 5-6 Weeks

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