Campbell Scientific 03001-L R.M. Young Wind Sentry Set - Manual (Page 16)

R.M. Young Wind Sentry
For dataloggers programmed with Edlog (and the CR200), the EX-DEL-SE
(P4) measurement instruction should be used. Enter a 2 in the P4 “Delay”
parameter for a 20 millisecond delay.
For dataloggers programmed with CRBasic, increase the “Settling Time”
parameter of the BRHalf instruction to 20 milliseconds (20,000 microseconds).
The 60 Hz rejection option can not be used with the DC
Half Bridge instruction, when the delay is not zero. Do not
use long lead lengths in electrically noisy environments. CAUTION
6. 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 manual.
The potentiometer has a life expectancy of fifty million revolutions. As it
becomes worn, the element can produce noisy signals or become non-linear.
Replace the potentiometer when the noise or non-linearity becomes
unacceptable.
Contact Campbell Scientific for a Return Materials Authorization (RMA)
number at (801) 753-2342.
7. Troubleshooting
7.1 Wind Direction
Symptom: -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 10K ohms between the
black and white wires. The resistance between either the black/red or
white/red wires should vary from 1K to 11K depending on vane position.
Resistance when the vane is in the 5 degree dead band should be about
1M ohm.
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