Campbell-scientific 024A-L Met One Wind Direction Sensor Manual de usuario descargar pdf (Pagina 16)

024A Met-One Wind Direction Sensor

codes, and delays for CSI dataloggers are listed in TABLE 7-2. The process

for determining the correct multiplier is provided in Section 7.4.2, Calibration

and Orientation.

TABLE 7-2. Parameters for Wind Direction

CR200(X)

CR10(X),

CR510

CR7, 21X,

CR23X

CR800, CR850,

CR1000

CR5000,

CR3000

Measurement

Range

2500 mV 250 mV, fast 500 mV, fast 2500 mV,

250 microsecond

integration,

reverse excitation

5000 mV,

250 microsecond

integration, reverse

excitation

Excitation

Voltage

2500 mV 500 mV 1000 mV 2500 mV 5000 mV

Delay or Settling

Time

2 ms 2 ms 2 ms 2 ms 2 ms

Multiplier See Section

7.4.2

See Section

7.4.2

See Section

7.4.2

See Section 7.4.2 See Section 7.4.2

Offset 0 0 0 0 0

7.4.2 Calibration and Orientation

Conversion of the voltage output into wind direction is done by entering the

proper multiplier. The proper multiplier is calculated by dividing 360 by the

full scale input voltage (i.e., 360/FSIV). The full scale input voltage (FSIV) is

the maximum voltage output from the wind vane. This is found by creating a

datalogger program with a multiplier of 1, the default excitation, and a fast

scan interval. With a multiplier of 1, the value stored in the variable or input

location is simply the voltage output. Slowly turn the wind vane; the shoulder

screw must first be removed. The maximum value observed is the full scale

input voltage (FSIV).

If the reading is -99999, exceeds 500 on the 21X or CR7, or

exceeds 250 on the CR10, then reduce the millivolts of excitation

by 5 mV.

NOTE

Multiplier 360/FSIV*

Offset 0.0

*FSIV = Full scale input voltage

Enter the calculated multiplier in the program.

Orientation of the 024A Wind Direction Sensor should be complete if the 024A

counter weight was aligned due south.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 29 30

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