Young Wind Sensor Calibration Accessories - Manual (Page 2)

Page 1
18860-90
R. M. YOUNG COMPANY
WIND SYSTEM CALIBRATION
Recommended Calibration Interval, Procedure, and Test Equipment
RECOMMENDED CALIBRATION INTERVAL
Operational Accuracy Research Accuracy
WS ± 0.5 m/s WD ± 5° WS ± 0.3 m/s WD ± 3°
TOWER CHECK 6 months 3 months
TRAILER CHECK 12 months 6 months
LABORATORY CHECK 24 months 12 months
MANUFACTURER CHECK N/A 24 months
OPERATIONAL ACCURACY
Manufacturer’s standard calibration is within operational accuracy limits. Perform tower check at initial installation. Tower check and trailer
check intervals are recommended minimums for optimum performance.
RESEARCH ACCURACY
Sensor requires wind tunnel calibration by manufacturer, or other recognized calibration laboratory, prior to initial installation. Tower check
and trailer check intervals are recommended minimums. Perform tower check at initial installation.
OUTPUT SIGNAL MEASUREMENTS
Wind speed signals vary among sensors. The signals may be frequency related for magnet/coil and photochopper transducers or
voltage related for tachometer generator transducers. Wind direction signals from potentiometer transducers are voltage related and are
dependent upon stable excitation voltage. To monitor wind speed and direction signals, use a suitable indicator. It may be a frequency meter,
voltmeter, calibrated wind indicator, data logger with display, or some combination of these instruments. As a general rule the resolution of
the indicator should be equal to the smallest unit being measured and the accuracy of the indicator should be 5 to 10 times better than that
required by the calibration. If necessary quantifiy and account for any additional error introduced by the indicating device.
WIND SPEED SENSOR TYPES
The following procedures refer to a propeller type wind speed sensor, however they are equally applicable to a cup wheel type sensor. To
check wind speed threshold of a cup wheel anemometer using the torque disc, hold or mount the sensor with the cup wheel shaft horizontal.