Campbell Scientific Open Path Eddy Covariance (OPEC) - Manual (Page 13)

OPEC Open-Path Eddy-Covariance System
TABLE 2-1. Nominal Sensor Power Requirements
Sensor Power (mW)
IRGASON 400 mA @ 12.5 Vdc
IRGASON (gas head powered 240 mA @ 12.5 Vdc
down)
KH20 10 - 20 mA @ 12.5 Vdc
HMP45C <3.8 mA @ 12.5 Vdc
logger Powe h
nd No RS-232 C
TABLE 2-2. Nominal Data r Requirements wit
the Display Off a ommunications
Datalogger Power (mW)
CR1000 w/ CFM100 & CF card 8 mA @ 12.5 Vdc
CR3000 w/ CFM100 & CF card 39 mA @ 12.5 Vdc
CR5000 w/ PC/CF card 63 mA @ 12.5 Vdc
logger Powe h
t t On, and No R ns
TABLE 2-3. Nominal Data r Requirements wit
he Display and Backligh S-232 Communicatio
Datalogger Power (mW)
CR1000 w/ CFM100 & CF card 109 mA @ 12.5 Vdc
CR3000 w/ CFM100 & CF card 75 mA @ 12.5 Vdc
CR5000 w/ PC/CF card 170 mA @ 12.5 Vdc
pply.
ary
pbell Scientific recommends that all
dataloggers in the field be earth grounded. All components of the system
upplies, mounts, housing, etc.) must be
und. When long cables are used or a site
3. System Data
sensors
18442 is a program for a basic system and p/n 18443 is a program for an
The OPEC system is powered by an external power supply system. The power
supply can be a Campbell Scientific PS84, a third party solar power supply
system, or a user supplied power system.
With a Campbell Scientific PS84 solar power system, connect the OPEC
sensor power cables to the positive and negative terminals of the power su
For a third party power system, see the specific power supply system manual
for installation and connection instructions.
Power connections are listed in the text files shipped with the datalogger
programs (p/n 18442 or 18443). Be sure the datalogger has a good earth
ground to provide maximum protection against voltage surges due to prim
and secondary lightning strikes. Cam
(datalogger, sensors, external power s
referenced to one common earth gro
has frequent lightning strikes, spark gaps may be required to protect the
datalogger from transient voltages.
logger Program
The open-path eddy-covariance datalogger program integrates all of the
in an open-path eddy-covariance station into a single system. Part number
extended system (with energy balance sensors). Each program is custom
written for the order. If your order did not include either p/n 18442 or 18443
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