Davis Instruments 7911 User Manual

Choosing the Best Anemometer Location
3
Attaching the Wind Cups
Before installing the anemometer, attach the wind cups. Wait until you have
installed the anemometer before you attach the wind vane.
1. Push the wind cups onto the smaller of the
two stainless steel shafts.
Tighten set
screw with
Allen wrench
Push cups onto
stainless steel
shaft
Attaching the Wind Cups
2. Slide the wind cups as far up the shaft as possible.
3. Use the allen wrench provided to tighten the set screw on the side of the
win
d cups.
4. Spin the wind cups. If they do not spin freely
, loosen the set screw, lower
the cups slightly, then retighten the set screw.
5. Repeat Step 4 until the wind cups spin freely.
Choosing the Best Anemometer Location
Use the following guidelines to determine the best location for your 
anemometer.
• Install the anemometer in a location where wind flow is unobstructed by
trees and nearby bu
ildings.
• For the most accurate readings, the anemome
ter should be mounted at least
4 feet (1.2 m) above the roof line.
• You may do this by mounting the anemometer on a television antenna mast,
a wooden post, or
a metal pipe.
• Make sure the antenna mast or metal pipe is properly grounded. You may
want
to use Davis’ Grounding Kit.
• If you are not certain about how to ground your installation, consult a
qual
ified professional for national and local codes.
Note: If you live in an area subject to frequent thunderstorms, installing a lightning rod nearby can reduce
the risk of damage.
Orient the Wind Vane
The wind vane rotates 360° to display current and dominant wind directions
on the
compass rose of the console display. To obtain accurate readings, the
vane must be correctly oriented when mounting the anemometer outside. By

Davis Instruments 7911 Specifications

Wind Direction

accuracy	±3°

Wind Speed

range	0 to 200 mph, 1 to 322 kph, 1 to 173 knots, 0.5 to 89 m/s
accuracy	±2 mph, ±3 kph, ±2 knots, ±1 m/s, ±5%