DAVIS vantage pro2 groweather User Manual page 35

Maintaining the Anemometer
The free movement of the wind vane and cups can be inhibited by dust, debris,
insects, and spider webs. With an Allen wrench, remove the cups and vane and clean
any dust or debris from the shafts and housing. Turn the shafts the cups and vane
rotate on. While the wind direction shaft should have more resistance than the wind
cup shaft, if either feels gritty or stiff, contact Davis Technical Support. Reattach the
cups and vane and tighten with the Allen wrench.
Note: Do not lubricate the shaft or bearings in any way. When replacing the cups, make sure
they are not rubbing against any part of the anemometer head.
Maintaining the 24- Hour Fan-Aspirated Radiation
Shield
The outer plating of the radiation shield should be cleaned when there is excessive
dirt and build-up on the plating. Wipe the outer edge of each ring with a damp cloth.
Note: Spraying down or using water excessively to clean the radiation shield can damage the
sensitive sensors or alter the data and readings the ISS is transmitting.
Check the radiation shield for debris or insect nests several times a year and
thoroughly clean as often as necessary. A buildup of material inside the shield
reduces its effectiveness and may cause inaccurate temperature and humidity
readings.
Tip: This also a good time to inspect and clean any debris or dust from the temperature-
humidity sensor assembly which is located inside the radiation shield.
The cross-section diagram shows how the
24-Hour Fan-Aspirated Radiation Shield
draws outside air up through the sensor
chamber and between the three walls
surrounding the sensor chamber, while the
shield stack prevents radiation heating of
the outer wall.
To clean it, disassemble the shield and clean
interior surfaces as necessary to prevent dirt
build up.
Check to make sure the fan is running by
listening for it, or by holding a piece of
tissue paper under the shield. See
"Contacting Technical Support" on page 39.
See "Replacing the Fan Motor and Batteries" on page 36.
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MOTOR
FAN
SENSOR
CHAMBER