Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 16)

CPEC200 Closed-Path Eddy-Covariance System
4.1.2.3 CPEC200 Valve Module
The optional CPEC200 valve module (FIGURE 4-8) is housed in the CPEC200
enclosure and is used to automate zero and CO
2
span checks, and automatically
perform a field zero and field CO
2
span on a user-defined interval. Field H
2
O
span requires a dewpoint generator and cannot be automated because the
dewpoint generator is a laboratory instrument. Therefore, H
2
O spans must be
performed manually.
The CPEC200 valve module is available in two versions, one with three valves
(pn 27559) and another with six valves (pn 26578). The valve module is
normally ordered as a factory-installed option of the CPEC200, but the module
can also be ordered separately and installed by the user.
FIGURE 4-8. CPEC200 valve module
4.1.2.4 CSAT3A Sonic Anemometer Head
The CSAT3A (FIGURE 4-9) is Campbell’s 3D sonic anemometer sensor head.
It shares integrated electronics (EC100 electronics) with the EC155 gas
analyzer. For detailed information and specifications, see the CSAT3 manual.
Campbell’s standalone sonic anemometer, the CSAT3, has its own
electronics box, whereas the CSAT3A shares the EC100
electronics with the EC155 gas analyzer. The measurement
specifications for the CSAT3 and CSAT3A are the same.
NOTE
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