uSonic-3 Scientific

3-AXIS Ultrasonic Anemometer measuring wind speed and direction. 50 Hz sampling rate. Formerly known as USA-1.
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uSonic-3 Scientific 3-axis ultrasonic anemometer

An accurate and versatile 3-AXIS Ultrasonic Anemometer for research applications. 50 Hz sampling rate with options for online turbulence calculation and head separation. Formerly known as USA-1.

The highly accurate uSonic-3 Scientific 3-axis ultrasonic anemometer is a powerful tool for serious wind and turbulence studies. With options for online turbulence calculations, separation of the measurement head from the control electronics, and the connection of external sensors the compact uSonic-3 Scientific is perfect for research applications and provides the ideal core of an eddy-flux / eddy correlation station.


  • accurate and reliable 3D wind sensor
  • high accuracy due to generic 2D and 3D wind tunnel calibration
  • 50 Hz sampling rate with 2D corrections
  • 30 Hz sampling rate with 3D corrections
  • wind speed range 0.01 – 45 m/s (0-100 mph)
  • verifies and reports data quality
  • sonic temperature measurement -40°C – +70°C
  • low power consumption (5W, 9-36Vdc)
  • option- extended wind speed range 60m/s
  • option – online turbulence calculations
  • option – separation of the sampling head to reduce flow distortions
  • option – analogue outputs
  • option – for up to 6 analogue inputs, 2 PT100 inputs and 2 TTL inputs
  • option – sensor head heating
  • optional mains power supply
  • optional field calibration kit
  • optional transport case

Technical Description

The uSonic-3 Scientific provides the following information in various data outputs which can be polled or output automatically:

  • instantaneous and averaged data for the three component wind vectors
  • virtual temperature
  • horizontal wind speed and direction plus vertical wind component
  • chart mode (provides 0-540º wind direction and speed values)
  • NMEA value outputs
  • raw data mode (uncorrected) or 2D / 3D head corrected data

Data can be averaged by:

  • scalar or vector
  • clock synchronised or running average
  • separate output rates and sampling times

Some other important features:

  • user definable north orientation (range 0-359º alignment off axis)
  • data quality control to perform confidence checks on raw data
  • date / time stamps with several options
  • check sum information
  • calibration validity output monitoring

Near real-time turbulence calculations available as an option:

  • mean wind components (3D) and temperature
  • Standard Deviations (SD) of components and temperature
  • covariances of different components and temperature
  • SD values comparing mean wind to parallel component as well as the horizontally and vertically perpendicular wind component
  • turbulence intensities
  • friction velocity
  • Drag coefficient
  • Monin-Obukhov stability
  • momentum and heat fluxes
  • u, v, w
  • direction and velocity mean components or values

Separation of the sensor head and control electronics available as an option:

  • reduced flow distortions due to less equipment around the area of measurement
  • more flexibility in mounting of the measurement head
  • 8m cable for connection between measurement head and control electronics


Wind Speed

0.01 - 45 m/s (0 - 100 mph)
+/- 2 % (full scale output)
0.01 m/s (steps)

Wind Direction

0 - 359°
+/- 2°
0.4° (steps)

Digital Output

RS422, RS485
Sampling rate
50 Hz (with 2D corrections), 30Hz (with 3D corrections)
up to 3600 seconds
Units of measure
m/s, knots, mph, km/h, °C


Internal Memory
15,300 standard samples or 2600 turbulence data sets
Sonic temperature
-40°C to 70°C in non-condensing environments
IP rating
32 cm x 69 cm (12 x 27 inches)
7.1 kg (15 Ibs)


sensor head
stainless steel (V4A)
electronic housing
powder-coated die-cast aluminium


9-36 VDC
Current draw
180 mA (@ 24 VDC


Extend wind speed range
Extension of the wind speed range to 60m/s (134 mph)
Online turbulence calculation
Extensive online turbulence calculations with near real time output. See above for details of available parameters
Separation of the sensor head
Measurement head separated from the control electronics by 8m of cable. Electronic control box fitted with connectors for connection to the sensor head and for the power and data cables
Analogue inputs
Options available for six high precision voltage inputs, two PT100 and two TTL inputs
Sensor head heating
Two levels of sensor head heating can be specified as an option; either 55W or 100W
Analogue outputs
Option available for four scalable analogue voltage outputs. 0-5V/±5V, 0-10V/±10V or 0-2.5V/±2.5V 12 Bit, scalable.
Mains Power Supply
Weather proof mains power supply available for either 110 or 240 Vac. Supplies power for both the sensor electronics and the optional heating
Calibration kit
A calibration kit is available to check the accuracy of the sensor in the field
Power and Data Cable
Power and data cable can be provided ready terminated at user defined lengths

Sales & Support

Contact Biral for more information

To find out more about this instrument or to discuss your application requirements please do not hesitate to contact Biral.

After Sales Support

Biral offers free advice and technical support for the lifetime of the instruments we sell. Once you have purchased the unit you can always contact us for help using the links on our Service Support page.

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