Instruction manual

CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER
3
TABLE 3-1. SDM Addressing Scheme
Datalogger
Address
(base 4)
CSAT3 Thumb
Switch
(HEX)
Address
(base 10)
00 0 0
01 1 1
02 2 2
03 3 3
10 4 4
11 5 5
12 6 6
13 7 7
20 8 8
21 9 9
22 A 10
23 B 11
30 C 12
31 D 13
32 E 14
4. INSTALLATION
4.1 ORIENTATION
The three components of wind are defined by a
right handed orthogonal coordinate system.
The CSAT3 points into the negative x direction
(see Figure 4-1). If the anemometer is pointing
into the wind, it will report a positive u
x
.
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
See Section 3 of the Tripod Weather Station
Installation manual for details and
recommendations on installing the tripod.
NOTE: Do not interchange electronics
boxes and transducer heads from different
CSAT3s. The electronics contain
calibration information that is specific to its
transducer head.
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 diameter pipe.
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 (see Figure 4-1).
CAUTION: Do not carry the CSAT3 by the
arms or the strut between the arms. Always
hold the CSAT3 by the block, where the
upper and lower arms connect.
Attach the electronics box to the body of the
tripod. 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.
CAUTION: Over-tightening bolts will
damage or deform the mounting hardware.
A krypton hygrometer can be mounted next to the
CSAT3 on the same vertical pipe (see Figure 4-2).