Campbell Scientific CSAT3B CSAT3B Three-Dimensional Sonic Anemometer - Page 40

Wiring

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CSAT3B Three-Dimensional Sonic Anemometer FIGURE 7-7. CSAT3B with fine-wire thermocouple mounted 7.5.2 Other Gas Analyzers If a fast-response gas analyzer is being used with the CSAT3B, care should be taken to mount the analyzer (open-path) or the analyzer intake (closed-path) as close as possible to the sonic sampling volume in order to obtain good spatial and temporal synchronicity between vertical wind and gas concentration fluctuations while also retaining adequate spatial separation. This will avoid excessive wind distortion. In general, mount the analyzer or its intake downwind of the sonic sampling volume. 7.6 Wiring On the back of the CSAT3B block there is a copper grounding lug (refer to FIGURE 4-3). Use a standard flat-head screwdriver to pinch an 8 AWG to 14 AWG wire between the lug and the lug screw. Campbell Scientific offers a 10 AWG copper wire (pn 4335) that is suitable for grounding sensors. Connect the other end of the wire to the tripod or tower, which should be grounded to Earth. The CSAT3B has three watertight circular ports or connectors at the rear of the block. These are labeled Power/SDM, USB, and CPI/RS-485 as shown in FIGURE 4-3. Unless a port is in use and connected to a cable, they should be securely covered by one of the caps that are captive to the CSAT3B. 30

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CSAT3B Three-Dimensional Sonic Anemometer
FIGURE 7-7.
CSAT3B with fine-wire thermocouple mounted
7.5.2 Other Gas Analyzers
If a fast-response gas analyzer is being used with the CSAT3B, care should be
taken to mount the analyzer (open-path) or the analyzer intake (closed-path) as
close as possible to the sonic sampling volume in order to obtain good spatial
and temporal synchronicity between vertical wind and gas concentration
fluctuations while also retaining adequate spatial separation.
This will avoid
excessive wind distortion. In general, mount the analyzer or its intake
downwind of the sonic sampling volume.
7.6
Wiring
On the back of the CSAT3B block there is a copper grounding lug (refer to
FIGURE 4-3).
Use a standard flat-head screwdriver to pinch an 8 AWG to 14
AWG wire between the lug and the lug screw. Campbell Scientific offers a 10
AWG copper wire (pn 4335) that is suitable for grounding sensors.
Connect
the other end of the wire to the tripod or tower, which should be grounded to
Earth.
The CSAT3B has three watertight circular ports or connectors at the rear of the
block. These are labeled
Power/SDM
,
USB
, and
CPI/RS-485
as shown in
FIGURE 4-3. Unless a port is in use and connected to a cable, they should be
securely covered by one of the caps that are captive to the CSAT3B.
30