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    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
    • ASCII
    • 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