Item No: 8371-UM


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Product Description

Ultrasonic anemometer, 240W heater, metal housing.

Extremely precise and maintenance-free measurement of wind velocity and wind direction as well as calculation of acoustic virtual temperature.

Includes 240W heater for use in cold climates.

The ultrasonic wind sensor is designed without mechanical parts as opposed to traditional “cups and vanes”. Features a robust design and precise measurements allowing for efficiency and accuracy of project control.

The digital or analog output delivers instantaneous, average, min or max value with flexible measuring rate. The VENTUS is heated in case reaching critical ambient conditions. Made for cold climate!

Recommended for:

  • Wind turbines
  • Marine/ships
  • Meteorology
  • Building automation

The following outputs are available:

  • NMEA
  • UMB
  • 4... 20 mA, 0...10V
  • SDI12

Specifications and additional product information
Lufft VENTUS-UMB 8371-UM
Dimensions Ø approx. 150 mm, height approx. 200mm
Weight approx. 1.7kg
Wind direction
Principle Ultrasonic- 2.4Ghz
Measuring range 0.1…359.9°
Resolution 0.1°
Accuracy ±2° RMSE >1.0m/s
Start-up Threshold 0.1m/s
Wind speed
Principle Ultrasonic- 2.4Ghz
Measuring range 0…75m/s
Resolution 0.1m/s
Accuracy ±0.2m/s or ±2% of reading, whichever is greater
Start-up Threshold 0.1m/s
Unit m/s; km/h; mph; kts
Virtual temperature
Principle Ultrasonic
Measuring range -58...+158°F (-50°C...+70°C)
Resolution 0.1 K
Accuracy ±2.0K (without heater and without sun exposure)
Measuring rate 60 partial measurements/15 full measurements per second
Measurement output rate 1-10 seconds adjustable, default 10s
Air pressure
Principle MEMS Capacitive
Measuring range 300…1200 hPa
Accuracy ±0.5 hPa
Data output digital
Interface RS 485 semi-/full duplex, isolated
Baud rate 1200-57600
Measurement rate instantaneous value 1-10s
Measurement Avg (arithmetic, vector), Min, Max 1-10min
Status Heating, sensor failure
Data output analog
only semi-duplex mode
output signal 4-20mA, 0...10V frequency (instantaneous, avg, min, max)
Load max.300 Ohm
Resolution 16bit
General Information
Operating temperature -40..+60°C (with heating)
Bus operation up to 32 devices
Operating voltage electronics 24 VDC ±10 % or 24 VDC/1.2 VA
with heating 24 VDC, max. 240 VA (140 W + 100 W)
connection 8 pole plug
Housing material Anodized aluminium, seawater-proof
Protection IP 65
Pole diameter 50 mm / 2"
factory certificate yes
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
Accessories (call for more information)
Surge protection 8379-USP-V
Power supply 24V/10A 8366-USV2
UMB interface converter ISOCON 8160-UISO
Connection cable Ventus/V200A, 15m incl. connector 8371-UK015
Connection cable Ventus/V200A, 50m incl. connector 8371-UK050
Connector Ventus/V200A 8371-UST1
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