Specifications

Met One 034B Windset
TABLE 5-1. Wind Speed Multiplier*
Model Meters/Second Miles/Hour
034B M = 0.7989
Off = 0.28
M = 1.787
Off = 0.63
*When configured to output counts, the multiplier above is divided
by the execution interval in seconds.
5.2 Wind Direction
The CR200(X) dataloggers use the ExDelSE instruction to measure wind
direction. All other CRBasic dataloggers (e.g., CR800, CR1000, CR3000,
CR5000) use the BRHalf instruction (see Section 5.4.1 for example).
Edlog dataloggers (CR510, CR10(X), CR23X) typically use Instruction 5 –
AC Half Bridge (P5) to measure wind speed (see Section 5.4.2 for example).
When the sensor cable length is greater than 100 ft, Edlog Instruction 4 –
Excite-Delay (P4) is recommended instead (see Section 5.5).
Excitation voltages, range codes, and multipliers for our dataloggers are listed
in Table 5-2. The multiplier value converts the sensor’s millivolt output to
degrees. Appendix B has additional information on the measurement
instructions.
TABLE 5-2. Parameters for Wind Direction
CR10(X)
CR510
CR7
21X
CR23X
CR800
CR1000
CR5000
CR3000
CR200(X)
Measurement Range,
Integration
2500 mV, slow 5000 mV,
slow/60 Hz
2500 mV,
60 Hz, reverse
excitation
5000 mV,
60 Hz, reverse
excitation
N/A
Excitation Voltage 2500 mV 5000 mV 2500 mV 5000 mV 2500 mV
Multiplier 720* 720* 720 720 0.288
Offset 0 0 0 0 0
*The multiplier for the Edlog dataloggers assumes Edlog Instruction 5 – AC Half Bridge is used. Refer to Section
5.5 if using Edlog Instruction 4 – Excite-Delay.
5.3 Wind Vector Processing Instruction
The Wind Vector output instruction is used to process and store mean wind
speed, unit vector mean wind direction, and Standard Deviation of the wind
direction (optional) from the measured wind speed and direction values.
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