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4. Installation

4.1 Orientation

The three wind components are defined by a right handed orthogonal coordinate system.

The CSAT3 points into the negative x direction. If the anemometer is pointing into the

wind, it will report a positive u-velocity. In general, point the anemometer into the

prevailing wind to minimize the amount of data that is contaminated by the anemometer's

arms and other supporting structures.

4.2 Mounting

The sonic anemometer is mounted to the top of the CM6/CM10 tripod (or any vertical

3/4" diameter US bore pipe) with a 3/4" by 3/4" Nu-Rail (P/N 1017), the Nu-Rail is

included with the CSAT3. The Nu-Rail will accommodate up to a 1" outside pipe

diameter. Attach the Nu-Rail to the vertical pipe and lightly tighten the vertical set

screws. Insert the horizontal mounting arm into the Nu-Rail and lightly tighten the

horizontal set screws. Point the horizontal arm into the prevailing wind. Tighten all the

Nu-Rail set screws. Mount the anemometer head to the horizontal arm. Lightly tighten

the bolt underneath the anemometer block. Attach the electronics box to the body of the

tripod (or 3/4" US bore pipe). Use a 1/2" wrench to tighten the nuts. Connect the cable

from the anemometer head to the connector on the electronics box labeled "Transducer

Head".

4.3 Leveling

Over flat terrain, adjust the anemometer head so that the bubble within the level is in the

bullseye. Over sloping terrain, adjust the anemometer head so that the horizontal surface

that the bubble is mounted on, is parallel to the terrain. Firmly grasp the anemometer

block, loosen the bolt underneath the block, and adjust the head accordingly. Finally,

tighten the bolt with a 9/16" wrench.

A copy of the Campbell Scientific Instruction Manual "CSAT3 Three Dimensional Sonic

Anemometer", Revision 3/98 will be kept on site.

The anemometer will be installed on site by Johns Hopkins University personnel.

5. Wiring

There are four military style connectors on the CSAT3 electronics box. They are labeled

as +12 SDM, RS-232, Transducer Head, and Analog Output. Connect the cable from the

anemometer head to the electronics box labeled Transducer Head. The anemometer head

cable is 2.13m (7ft) in length. Each of the signal cable is 7.62m (25ft) in length. Connect

the appropriate signal cable to the electronics box. For this experiment, the SDM Output

will be connected to a CR23X datalogger. The wire color scheme is given in Table 1 and

Table 2.

1 2 3 4 5 6 7 8 9

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Campbell CSAT3 Manual de usuario Pagina 4