Campbell CPEC300, Product Manual, Page: 22 / 175

CPEC300/306/310 Closed-Path Eddy-Covariance Systems
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4.6 Optional Components
The following sections describe optional components that are available to
expand the capabilities of the CPEC306 or the CPEC310. The specific
configurations will depend on specific site conditions, data requirements, and
research goals.
4.6.1 CDM-A116
The CDM-A116 (FIGURE 4-16 ) is a 24-bit analog input module that can
increase the capacity of analog channels in a datalogger system. The CDM-
A116 has 16 additional channels available. The CPEC306 and CPEC310
enclosures both allow for the addition of CDM-A116 modules.
FIGURE 4-16. CDM-A116
4.6.2 CPEC310 Scrub Module
The CPEC310 scrub module 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 CPEC300 system enclosure. The scrub module (shown in
FIGURE 4-17 and FIGURE 4-18 ) 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 CPEC310 scrub module can be found in
Appendix K , CPEC310 Scrub Module Installation, Operation, and
Maintenance
(p. K-1)
.