OTT HydroMet

- Model Ventus - Ultrasonic Wind Sensor

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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 provides compatibility of the Lufft Ventus for commercially available hydrometeorological dataloggers and PLC systems. An automatic heater ensures reliable operation even in the lowest temperature.

  • Parameters measured: Wind speed, wind direction, virtual temperature, barometric pressure
  • Measurement technology: Ultrasonic
  • Product highlights: Maintenance-free measurement, suitable for extreme ambient conditions, ice-free operation, vibration and seawater resistant, compatible interfaces
  • Interface: SDI-12, RS-485, various RS-485-protocols, analogue output

  • 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)

The robust and maintenance-free wind sensor is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

Examples

  • Synoptical automatic weather stations of meteorological services
  • Weather stations at airports, marinas and onboard ships
  • Wind turbine control
  • Weather observation for road and traffic control systems
  • Mountain weather stations for avalanche and flood warning
  • Hydro-meteorological stations

  • Data:
    • Measured: wind speed, wind direction, virtual air temperature, barometric pressure
    • Calculated:
      • instantaneous values in intervals from 1 to 10 seconds, vector and scalar means in intervals from 1 to 10 minutes
      • max/min values of the wind direction sectors
      • maximum gust of wind and wind direction, virtual temperature
  • Wind speed:
    • Measuring method: 4 x 10 Hz ultrasonic sensors
    • Measuring range: 0 ... 75 m/s
    • Resolution: 0.1 m/s
    • Accuracy: ±0.2 m/s or ±2 % RMS
    • Threshold: 0.1 m/s
  • Wind direction:
    • Measuring method: 4 x 10 Hz ultrasonic sensors
    • Measuring range: 0 ... 359,9°
    • Resolution: 0.1°
    • Accuracy: < 2° (> 1m/s) RMSE
    • Threshold: 0.1 m/s
  • Virtual air temperature:
    • Measuring method: ultrasonic technology
    • Measuring range: -50 ... +70 °C
    • Resolution: 0.1 °C
    • Accuracy: ±2 K (no heating, no solar irradiation, or wind speed above 4 m/s)
  • Barometric pressure:
    • Measuring method: MEMS-Sensor, capacitive
    • Measuring range: 300 ... 1200 hPa
    • Resolution: 0.1 hPa
    • Accuracy: ±1.5 hPa
  • Electrical data:
  • Interfaces selectable using the Lufft-Config tool (PC-SW for Windows OS):
    • SDI-12: release 1.3 (factory setting)
    • RS-485: galvanically isolation, halb-duplex, baud rates 1200 ... 19200
    • RS-485 protocols: binary, ASCII, TLS2002FG3, MODBUS, NMEA-WIMWV
    • Analog output: 4 ... 20 mA or 2 ... 10 VDC, 16 bits
  • Power supply:
    • Input voltage: 10,5 ... 28 VDC
  • Power consumption (sensor): 50 mA @ 12 VDC
    • Heater: 24 VDC/240 Watt
  • Ambient
    • Operating temperature range: -40 °C ... +60 °C (with heater), -20 °C ... +60 °C (without heater)
    • Storage temperature: -55 °C ... +80 °C
    • Relative humidity: 0 ... 100 % R.H.
  • Mechanical data:
    • Dimensions (H x Ø): 170 mm x 150 mm
  • Weight
  • Material: seawater resistant AlMg3Si aluminium alloy
  • Color
  • Fastener (Ø)
  • Protection and standards:
  • Type of protection
  • Standard
    • EMC directive: 2004/108/EG
    • Emitted interference: EN 55011:2009, EN 61000-6-3
    • Immunity: EN 61000-6-6 and EN 61000-4-2/3/4/5/6/8
    • Vibration: IEC 60068-2-6/IEC 60945
    • Salt spray: MIL-Std 810, 509.3
    • Ice: MIL-Std 810F, 521.2

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