Air Velocity/Air Speed                                                                NVLAP Logo

high-velocity wind tunnel photo low-velocity wind tunnel

The ORNL Metrology Laboratory provides a full suite of air velocity/air speed calibration capabilities to meet almost any requirement.  Laser Doppler Calibration photoCalibration capabilities include thermal anemometer, vane anemometer, propeller anemometer, swinging-vane anemometer, sonic anemometer, ultra-sonic anemometer, pitot tubes and laser-doppler anemometer.  Air speed/air velocity calibration ranges include low range (40-1260 ft/sec, 0.20-6.4 m/s) and high range (40-8850 ft/min, 0.20 45 m/s).

Both the low air velocity/air speed range and high range are fully accredited by the National Voluntary Laboratory Accreditation Program (NVLAP). The uncertainties for both ranges are very similar to the uncertainties offered by NIST in their wind tunnels.laser doppler display photo

The low range air velocity/air speed calibrations are performed in a wind tunnel with a 12-inch X 12-inch (30.5 X 30.5 cm) cross-section test section which is capable of handling most thermal anemometer, vane anemometer and pitot tubes and many sonic anemometer, ultrasonic anemometer and propeller anemometer.

The high range air velocity/air speed calibrations are performed in a smaller wind tunnel with a 4-inch X 4-inch (10.2 X 10.2 cm) test section, capable of handling most thermal anemometer, pitot tubes and some mini vane anemometer.

Following are the ranges and best measurement capabilities for the high and low range air velocity/air speed calibration capabilities offered by the ORNL Metrology Laboratory.  To view the entire ORNL NVLAP scope of accreditation, please visit http://ts.nist.gov/Standards/scopes/2006590.pdf

Air Velocity/Air Speed Calibration Capabilities

Range

Best Uncertainty
(+/-) % of Reading + m/s *

Remarks

Accredited

0.20 m/s to 6.4 m/s

0.77 + 0.0028

ELD Wind Tunnel

Yes

       

0.20 m/s to 1.25 m/s

0.80 + 0.0037

TSI Wind Tunnel

Yes

1.25 m/s to 7.5 m/s

1.1 + 0.0030

7.5 m/s to 45 m/s

0.90 + 0.029

       

* Represents an expanded uncertainty using a coverage factor, K=2, at an approximate level of confidence of 95%.

Any reference to "accredited" or "accreditation" refers to the National Voluntary Laboratory Accreditation Program (NVLAP) and applies to calibration services only as performed by the Oak Ridge National Laboratory's (ORNL) Metrology Laboratory (Lab Code 200159-0). Refer to the ORNL NVLAP scope of accreditation for details.

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