Troubleshooting; Wind Direction; Wind Speed; References - Campbell 05103 Product Manual

9.

Troubleshooting

9.1

Wind Direction

9.2

Wind Speed

10. References

Symptom: NAN, –9999, or no change in direction
1. Check that the sensor is wired to the excitation and single-ended terminal
specified by the measurement instruction.
2. Verify that the excitation voltage and range code are correct for the data
logger type.
3. Disconnect the sensor from the data logger and use an ohmmeter to check
the potentiometer. Resistance should be about 10 kΩ between the blue and
white wires. The resistance between either the blue/green or white/green
wires should vary between about 1 kΩ to 11 kΩ depending on vane
position. Resistance when the vane is in the 5 degree dead band should be
about 1 MΩ.
Symptom: Incorrect wind direction
1. Verify that the excitation voltage, range code, multiplier and offset
parameters are correct for the data logger type.
2. Check orientation of sensor as described in Section 7, Installation
Symptom: No wind speed
1. Check that the sensor is wired to the pulse terminal specified by the pulse
count instruction.
2. Disconnect the sensor from the data logger and use an ohmmeter to check
the coil. The resistance between the red and black wires should be about
2075 Ω. Infinite resistance indicates an open coil; low resistance indicates
a shorted coil.
3. Verify that the configuration code, and multiplier and offset parameters
for the pulse count instruction are correct for the data logger type.
Gill, G.C., 1973: The Helicoid Anemometer Atmosphere, II, 145–155.
Baynton, H.W., 1976: Errors in Wind Run Estimates from Rotational
Anemometers, Bul. Am. Met. Soc., vol. 57, No. 9, 1127–1130.
The following references give detailed information on siting wind speed and
wind direction sensors.
EPA, 1989: Quality Assurance Handbook for Air Pollution Measurements
System, Office of Research and Development, Research Triangle Park,
NC, 27711.
Wind Monitor Series
.
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