Campbell Scientific 014A Met One Wind Speed Sensor - Manual (Page 19)

Met One 014A Wind Speed Sensor
Short Cut cannot edit programs after they are imported and edited
in CRBasic Editor.
A Short Cut tutorial is available in Section 4.2, Use SCWin to Program
Datalogger and Generate Wiring Diagram. If you wish to import Short Cut
code into either CRBasic Editor or Edlog to create or add to a customized
program, follow the procedure in Appendix A.1, Importing Short Cut Code
into a Program Editor. Programming basics for CRBasic and Edlog
dataloggers are provided in the following sections. Complete program
examples for select dataloggers can be found in Appendix B, Example
Programs.
7.4.1 Wind Speed
Wind speed is typically measured with a pulse count instruction, using the
switch closure configuration. For dataloggers programmed with Edlog, specify
configuration code 22 to output frequency in hertz.
If using a control port, see Appendix B.2, Control Port Example Program.
The expression for wind speed (U) is:
U = MX + B
where
M = multiplier
X = number of pulses per second (hertz)
B = offset
TABLE 7-3 lists the multipliers (M) and offsets (Off) to obtain meters/second
or miles/hour when the pulse count instruction is configured to output the result
in Hz.
TABLE 7-3. Wind Speed Multiplier*
Model Meters/Second Miles/Hour
014A M = 0.8000
Off = 0.447
M = 1.789
Off = 1.0
*When configured to output counts, the above multiplier is divided
by the execution interval in seconds
8. Maintenance
8.1 Suggested Maintenance Schedules
8.1.1 6 to 12 Month Periodic Service
Visually inspect the anemometer cups for cracks and breaks, and make sure
that each arm is securely attached to the cup assembly hub. Also check to see
that the vent hole, located at the base of the sensor, is unobstructed.
Special caution is advised under adverse conditions of high winds, heat, and/or
sandy areas. Look for abrupt stopping of the cup assembly with slow cup
rotation. If this occurs, the bearings may need to be replaced.
NOTE
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