Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 19)

CPEC200 Closed-Path Eddy-Covariance System
Minimize the length of these tubes to reduce the amount of equilibration time
required after the zero or CO
2
span cylinder is selected. One long tube is
required to connect the valve module to the EC155, and two short tubes are
required to connect the zero and CO
2
span cylinders to the valve module. Pre-
swaged tube assemblies (pn 21823-L) are available for this purpose.
CPEC200 Scrub Module: The CPEC200 scrub module (pn 27423) provides
a source of zero air and is used for zeroing the EC155. It consists of a pump
and a three-stage molecular sieve and connects to the CPEC200 system
enclosure. The scrub module (shown in FIGURE 4-10) eliminates the need for
a cylinder of zero air. A cylinder of known CO
2
is still required. The module
reduces the need for one of the two cylinders for zero/span and is useful in
locations where transporting and replacing cylinders is inconvenient.
Additional information regarding installation and maintenance of the CPEC200
scrub module can be found in Appendix G, CPEC200 Scrub Module
Installation, Operation and Maintenance.
FIGURE 4-10. CPEC200 scrub module
AC/DC Power Adapter Kit: An AC/DC adapter kit (pn 28549) can be
configured within the CPEC200 system enclosure with a peripheral mounting
kit (pn 16987). This configuration allows the CPEC200 to be powered from
AC mains power. See Appendix F, Installing the AC/DC Power Adapter Kit,
for more information.
CF Card: The CPEC200 stores data on a CompactFlash® memory card.
There are two types of CF cards available today: industrial grade and standard
or commercial grade. Industrial grade PC/CF cards are certified to a higher
standard in that they are designed to operate over a wider temperature range,
offer better vibration and shock resistance, and have faster read/write times
than their commercial counterparts. Campbell Scientific recommends the use
of industrial-grade cards, such as the CFMC2G or CFMC16G (FIGURE 4-7)
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