Young Wind Sensor Calibration Accessories User Manual
METEOROLOGICAL INSTRUMENTS
INSTRUCTIONS
WIND SYSTEM CALIBRATION
RECOMMENDED CALIBRATION INTERVAL,
PROCEDURE, AND TEST EQUIPMENT
MODEL 18860-90
INCLUDES INSTRUCTIONS FOR THE FOLLOWING
MODEL 18802/18811 ANEMOMETER DRIVE
MODEL 18112/18212 VANE ANGLE FIXTURE
MODEL 18310/18312 TORQUE DISC
MODEL 18331 VANE TORQUE GAUGE
R.M. YOUNG COMPANY 2801 AERO PARK DRIVE, TRAVERSE CITY, MICHIGAN 49686, USA
TEL: (231) 946-3980 FAX: (231) 946-4772 WEB: www.youngusa.com
P/N: 18860-90
REV: B062309
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 quantiy 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.
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18860-90
TOWER CHECK
Perform tower check for each initial installation regardless of prior calibration interval.
PROCEDURE
Wind Speed Threshold:
Wind Speed Signal:
Wind Direction Threshold:
Wind Direction Signal:
In calm weather blow gently on propeller. Watch for obvious high torque
or irregular rotation.
Remove propeller or cupwheel. Drive shaft at known rpm, representing
mid range of sensor. Compare output signal to established calibration.
In calm weather blow gently on vane. Watch for obvious high torque or
irregular motion.
Visually align vane with known reference. Compare output signal. Align
vane with additional reference points or cardinal points marked on housing. Compare output signal to established calibration.
None
Anemometer Drive
None
Survey of visible landmarks, accurate magnetic compass, or solar
noon orientation.
TRAILER CHECK
Sensors are removed from tower and connected to signal conditioning modules with sensor cable patch cords.
EQUIPMENT
Wind Speed Threshold:
Wind Speed Signal:
Wind Direction Threshold:
Wind Direction Signal:
PROCEDURE
Remove propeller. Set torque disc for proper torque according to table and
curves supplied. Install torque disc on propeller shaft and check rotation
of disc. See instructions on torque disc drawing.
Remove propeller. Drive shaft at 200 rpm. Check output for measurable
signal. Drive shaft at rpm representing mid range of sensor. Compare
output signal to established calibration.
Hold or mount sensor on desk top with n horizontal to check vane balance. Adjust if required. After balancing vane assembly, mount sensor
on bench stand on level surface. Determine proper torque according to
table and curves supplied. Place torque gauge on vane housing and apply steady force to end of leaf spring. Record maximum torque value for
both CW and CCW rotation. See instructions on torque gauge drawing.
Mount sensor on Bench Stand. Rotate xture through 360 degrees comparing output signal at 30 degree intervals.
EQUIPMENT
Propeller Torque Disc
Anemometer Drive
Vane Torque Gauge
Vane Angle Bench Stand
Vane Angle Bench Stand
18860-90
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LABORATORY CHECK
Sensors and signal conditioning modules are removed from eld site to calibration lab equipped with calibration xtures and test equipment
and operated by a qualied instrument technician.
Wind Speed Threshold:
Wind Speed Signal:
Wind Direction Threshold:
Wind Direction Signal:
PROCEDURE
Remove propeller. Set torque disc for proper torque according to table and
curves supplied. Install torque disc on propeller shaft and check rotation.
See instructions on torque disc drawing.
Drive propeller shaft at 200 rpm, observe output on oscillioscope for
minimum signal level and proper form. Drive propeller shaft at a minimum
of three other rpm values throughout the working range of the propeller,
checking output signal at each speed. Compare to established calibration.
Check vane balance and adjust if required. After balancing vane assembly,
mount sensor on bench stand on level surface. Determine proper torque
according to table and curves supplied. Place torque gauge on vane
housing and apply steady force to end of leaf spring. Record maximum
torque value for both CW and CCW rotation. See instructions on torque
gauge drawing.
Install sensor on vane angle xture. Check output signal at 30° intervals
with additional checks at 340°, 350°, and 355°.
Propeller Torque Disc
Oscilloscope
Anemometer Drive
Vane Torque Gauge
Vane Angle Bench Stand
Vane Angle Fixture
EQUIPMENT
MANUFACTURER CHECK
Return sensors to manufacturer or other recognized calibration lab. These tests are performed at manufacturer's facilities or calibration
lab facilities on a fee basis.
Wind Speed Threshold:
Wind Speed Signal:
Wind Direction Threshold:
Wind Direction Signal:
PROCEDURE
Check and adjust propeller balance. Install sensor on threshold xture.
Measure and record starting and stopping wind speed values.
Install sensor in wind tunnel. Measure and record output signal at 1, 2,
3, 4, 5, 6, 8, 10, 12, 14, 16, 20, and 25 and 30 m/s. Tabulate wind tunnel speed vs. sensor output. Calculate and record slope and intercept.
Measure vane torque and record equivalent threshold wind speed.
Install sensor on master vane angle xture. Measure and record output
signal through complete 360° rotation. Measure and record electrical
function angle.
EQUIPMENT
Threshold xture
Wind tunnel facility
Vane torque xture
Master vane angle xture
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