VENTUS-UMB

Extremely precise and maintenance-free measurement of wind speed and wind direction even in the lowest temperature.

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Ventus

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.

Technical specification

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