Campbell Scientific Solar1000 Station - Manual (Page 33)

4. Met One 034B Windset
4.1. General
The 034B Windset is used to measure horizontal wind speed and direction.
Wind speed is measured with a three cup anemometer. Rotation of the cup
wheel opens and closes a reed switch at a rate proportional to wind speed.
Vane position is transmitted by a 10K ohm potentiometer. With a precision
excitation voltage applied, the output voltage is proportional to wind direction.
The accompanying Met One manual contains additional information on the
operating principals, installation, and maintenance of the sensor.
Cable length for the 034B is specified when the sensor is ordered. Table 4.1-1
gives the recommended cable length for mounting the sensor at the top of the
tripod/tower with a CM202 crossarm.
CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30
11’ 14’ 14’ 19’ 24’ 14’ 24’ 37’
The 034B Windset ships with:
(1) 1/16” Allen wrench
(1) Bushing from Met One
(1) Calibration Sheet
(3) Direction hub stickers
(1) Resource CD
(1) Wind Vane
(1) Sensor cable of user-specified length
4.2. Specifications
Wind Speed
Operating Range: 0 to 75 m s -1 (0 to 167 mph)
Threshold: 0.4 m s -1 (0.9 mph)
Accuracy:
±0.12 m s -1 ( ±0.25 mph) for wind speed < 10.1 m s -1 (22.7 mph)
±1.1% of reading for wind speeds > 10.1 m s -1 (22.7 mph)
Output Signal: contact closure (reed switch)
Resolution: (1.789 mph) / (scan rate in seconds)
or (0.7998 m s -1 ) / (scan rate in seconds)
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Table 4.1-1 Recommended Cable Length