Davis Instruments 7911 User Manual

Troubleshooting
7
Troubleshooting
While your anemometer is designed to provide years of trouble-free operation,
occasionally problems may arise. If you are having a problem with your unit,
please check the following troubleshooting procedures before sending the unit
in for repair. You will be able to solve many of the problems yourself. If, after
checking these procedures you are unable to solve the problem, please call
Davis Technical Support for further instructions (
see “Contacting Davis
Instruments Technical Support” on page 8.) Please do not return your unit for
repair without receiving prior authorization from Davis Technical Support.
Wind speed reads 0 all the time or intermittently or wind
direction reading is dashed out
• Make sure anemometer is plugged into jack marked WIND on junction box.
• Check for broken wire along length of anemometer cable. Carefully check
areas where the cable has been secured.
• Try dropping the wind cups approximately 1/16" to 1/8" (1.5 to 3 mm)
lower on the mounting shaft. Use the included Allen wrench to loosen and
retighten the wind cup assembly.
• If you still do not get a reading, the problem is with the anemometer. 
Contact Davis Technical Support for return authorization.
Wind speed reading seems too high or too low
• Check installation by spinning wind cups. If the wind cups spin freely and
the weather station displays a wind speed, the wind cups are installed
correctly. If the wind cups don’t spin freely, then try dropping the wind cups
approximately 1/16" to 1/8" (1.5 to 3 mm).
• Check calibration number and adjust if necessary.
• Check for any obstructions blocking the wind near the anemometer.

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%