Campbell Scientific 034B-L Met One Windset - Manual (Page 20)

Met One 034B Wind Set
7.4.4 Long Lead Lengths
When sensor lead length exceeds 100 feet, the settling time allowed for the
measurement of the vane should be increased to 20 milliseconds.
For dataloggers programmed with CRBasic, increase the Settling Time
parameter of the CRBasic instruction to 20 milliseconds (20,000
microseconds).
8. Sensor Maintenance
Monthly
• 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. Verify cups and vane are tight.
6 Months
• Replace anemometer bearings if operating under harsh conditions.
Annually
• Replace anemometer bearings. Refer to the Assistance page at the
beginning of this document for the procedure of returning the sensor to
Campbell Scientific for bearing replacement.
2 Years
• Replace the wind vane potentiometer and bearings. 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 vary from 11 to 21 kohms between
the blue and green wires depending on vane position. Resistance should
vary from 1 to 11 kohms between the white and green wires depending on
vane position.
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