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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.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 41 42

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