Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 101)

Appendix G. CPEC200 Scrub Module Installation, Operation and Maintenance
Edit the CPEC200 CRBasic program to set constant SCRUB_MODULE =
True and recompile.
The CPEC200 program will add the appropriate variables. It will control the
temperature of the scrub module whenever it controls the temperature of the
valve module. It will turn on the scrub module pump whenever the Zero Air
valve is selected. The scrub module will push a flow of ambient air that has
been scrubbed of CO
2
and water through the valve module to the EC155.
G.4 Maintenance
Once per year, refill the first bottle with fresh molecular sieve (CSI pn 27450,
molecular sieve 13X, 1.6-2.5 mm beads, 250 g. or VWR pn AAB21109-30)
according to the following steps:
1. Power down the CPEC200 or unplug the scrub module cable from the
CPEC200. This will ensure the scrub module pump does not turn on
while you replace the molecular sieve.
2. Open the door of the scrub module enclosure to expose the bottles
containing the molecular sieve as shown in FIGURE G-2.
FIGURE G-2. Scrub module interior
3. Disconnect the fully exposed black tube (S-shaped and tied to the
center of the cover as shown in FIGURE G-2) at both ends. This tube
remains captive to the cover plate.
G-3