Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 37)

CPEC200 Closed-Path Eddy-Covariance System
5.3.3 Pump Module Cable
Ensure the CPEC200 system is not powered, and connect the pump module
cable to the bottom of the CPEC200 system enclosure.
5.3.4 Apply Power
The CPEC200 requires a 10.5 to 16.0 Vdc power source. Its average power
consumption is 12 W typical but will be slightly higher at cold temperatures,
especially at startup in cold weather. In typical remote applications the power
will be supplied from a user-provided 12 Vdc battery system charged with
solar panels. If AC mains power is available it may be convenient to use the
AC/DC power adapter (see Appendix F, Installing the AC/DC Power Adapter
Kit) for details.
Before applying power, verify all of the tubes and cables have
been connected according to the instructions above.
To reduce the risk of shorting the power supply, especially
when using batteries, connect the power cable to the
CPEC200 first and then connect the other end to the power
source. Carefully design any DC power source to ensure
uninterrupted power. If needed, contact a Campbell
Scientific applications engineer for assistance.
Connect a power cable (CABLEPCBL-L) from the CPEC200 power terminals,
as shown in FIGURE 5-10, to a user-supplied, 12 Vdc power supply.
Relieve strain on the cables in the CPEC200, by using a cable tie to secure the
cables to the cable-tie loop on the plate next to the CPEC200 DIN rail.
Replace the cap on the CPEC200 enclosure feedthrough. Gently bend the
cables back as you slide the cap on and rotate the cap to minimize the space
around the cables. Tighten the thumbscrew to further relieve strain on the
cable. This will also minimize air infiltration and extend the life of the
enclosure desiccant packs.
In very humid conditions it may be helpful to seal the cable
feedthrough with plumber’s putty.
The CPEC200 stores energy in a capacitor to provide backup
power in the event power is interrupted. The capacitor will power
the datalogger for a few seconds allowing it to finish writing data
to the CF card and close the file to prevent loss of data or damage
to the CF card. Do not attach additional sensors or other devices
that are powered from the datalogger without consulting a
Campbell Scientific applications engineer.
NOTE
CAUTION
NOTE
NOTE
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