VENTUS-UMB
Extremely precise and maintenance-free measurement of wind speed and wind direction even in the lowest temperature.
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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.
Technical specification
| 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 |
| 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 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 |
| Principle | Ultrasonic |
| Measuring range | 0...359.9 ° |
| Unit | ° |
| Accuracy | ±2° RMSE >1.0 m/s |
| Resolution | 0.1 ° |
| 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 |
| 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 |
| Principle | MEMS capacitive |
| Measuring range | 300...1200 hPa |
| Unit | hPa |
| Accuracy | ±1.5 hPa |
| Resolution | 0.1 hPa |
