Campbell 03002, Instruction Manual

Page: 24 / 39

R.M. Young Wind Sentry
15
8. Sensor Maintenance
Every month do a visual/audio inspection of the anemometer at low wind
speeds. Verify that the cup assembly and wind vane rotate freely. Inspect the
sensor for physical damage.
Replace the anemometer bearings when they become noisy, or the wind speed
threshold increases above an acceptable level. The condition of the bearings
can be checked with a paper clip as described in the R.M. Young 03002
manual (see Section 10 , References
(p. 16)
).
The potentiometer has a life expectancy of fifty million revolutions. As it
becomes worn, the element can produce noisy signals or become nonlinear.
Replace the potentiometer when the noise or nonlinearity becomes
unacceptable.
Refer to the Assistance page at the beginning of this document for the
procedure of returning the sensor to Campbell Scientific for wind vane and
bearing replacement.
9. Troubleshooting
9.1 Wind Direction
Symptom: NAN, –9999, or no change in direction
1. Check that the sensor is wired to the excitation and single-ended channel
specified by the measurement instruction.
2. Verify that the excitation voltage and range code are correct for the
datalogger type.
3. Disconnect the sensor from the datalogger and use an ohm meter to check
the potentiometer. Resistance should be about 10 k Ω between the black
and white wires. The resistance between either the black/red or white/red
wires for the 03301 and blue/red or white/red for the 03002 should vary
from 1 k Ω to 11 k Ω depending on vane position. Resistance when the
vane is in the 8-degree dead band should be about 1 M
Ω
.
Symptom: Incorrect wind direction
1. Verify that the excitation voltage, range code, multiplier, and offset
parameters are correct for the datalogger type.
2. Check orientation of sensor as described in Section 7.2 , Assembly and
Mounting
(p. 7)
.
9.2 Wind Speed
Symptom: No wind speed
1. Check that the sensor is wired to the pulse channel specified by the pulse
count instruction.