Appendices - DAVIS Vantage Pro2 Installation Manual

Appendices

Appendix A: Re-orienting the Wind Vane
The Vantage Pro2 station is configured to register wind direction correctly if
the anemometer points to true north. If the anemometer shaft can not be
mounted to point to true north, use the following instructions to correct the
wind vane orientation.
• Do not rely on a compass unless it is properly calibrated. In North America
there can be up to 15° variation between true north and a raw compass read-
ing.
• Correct the wind direction readings by calibrating the wind direction in the
Vantage Pro2 console. See the Vantage Pro2 Console Manual for informa-
tion.
• To orient the wind vane accurately, look at the console display. Have another
person watch the console display while orienting the wind vane.
• Also, re-orient the wind vane before the anemometer is installed if the direc-
tion in which the anemometer will be installed is already known.
To re-orient the wind vane:
1. Loosen the wind vane set screw.
2. Pull the vane directly up and off the steel shaft on
which it turns.
3. Press WIND on the console to display current
wind direction in degrees.
4. Use a reliable map or a landmark to determine in
which direction (S, E, W, etc.) the anemometer
arm is now pointing.
5. Use the wind direction chart or compass markings
to find the degree reading which corresponds to
that direction.
6. Slowly turn the stainless-steel wind direction shaft with your fingers. Stop turn-
ing when the display reaches the degree reading obtained in step 3.
Please allow the wind direction display approximately 5 seconds to stabilize
after the shaft is turned. Turn the shaft, wait, and turn it again until the desired
wind direction is displayed on the console.
7. Being careful to keep the stainless-steel shaft from turning, place the wind vane
on top of shaft with the vane's nose pointing in the same direction as the arm.
8. Slide the wind vane down the shaft as far as it will go.
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Wind Direction Chart