Davis Instruments 7904, 7906L, 7906 Instruction Manual
Replacement Wind Vane (7904, 7906L & 7906)
Is this the correct vane for your system?
The newest Davis anemometer has a D-shaped (in cross section) shaft on the
anemometer head. Older anemometers have a round (in cross section) shaft. You
must make sure that the replacement vane fits the shaft on your existing
anemometer head.
7906L or 7906: This vane is for use on a D-shaped wind vane shaft.
Wind Vane Shaft
(D-shaped)
Right
Wrong
Anemometer
Head
7904: This vane is for use on a round wind vane shaft.
Wind Vane Shaft
(round)
Right
Wrong
Anemometer
Head
Note: If your anemometer looks like the one illustrated below, the shaft is round.
Anemometer
Head
(round shaft)
1
Install the new vane: 7906L or 7906, for D-Shaped Shaft
1. Remove the old vane by loosening the set screw with 0.05”Allen wrench.
2. Replace the new vane on the shaft. It will only go on one way and will be
automatically correctly calibrated for wind direction when the anemometer is
installed with arm pointing north.
Wind Vane
Wind Vane Shaft
(D-Shaped)
Anemometer
Head
3. Remount your anemometer so that the arm is pointing true north.
Tighten set
screw with
Allen wrench
Note: If you cannot mount the anemometer with the arm pointed north, you will need to calibrate the
2
wind direction on your console. See your Vantage Pro2 Console User’s Manual for instructions.
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