Young Wind Sensor Calibration Accessories - Manual (Page 4)

Page 3
18860-90
LABORATORY CHECK
Sensors and signal conditioning modules are removed from field site to calibration lab equipped with calibration fixtures and test equipment
and operated by a qualified 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 fixture. Check output signal at 30° intervals
with additional checks at 340°, 350°, and 355°.
EQUIPMENT
Propeller Torque Disc
Oscilloscope
Anemometer Drive
Vane Torque Gauge
Vane Angle Bench Stand
Vane Angle Fixture
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 fixture.
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 tun-
nel 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 fixture. Measure and record output
signal through complete 360° rotation. Measure and record electrical
function angle.
EQUIPMENT
Threshold fixture
Wind tunnel facility
Vane torque fixture
Master vane angle fixture