EC150 CO
2
/H
2
O Open-Path Gas Analyzer
26
More recently, programs have been developed that efficiently record and
correctly process data from instruments such as the EC150, as well as compile
them with data from other, complementary instruments. Campbell Scientific
has developed a program,
EasyFlux™ DL,
that both records and processes raw
data from the EC150 to provide useful measurements immediately. An
overview of both approaches is given in the sections below.
6.4.1 Data Collection and Processing with
EasyFlux DL
EasyFlux DL
is an open source
CRBasic
program that allows a CR6 or
CR3000 datalogger to collect fully corrected measurements from an EC150
instrument. The program is compatible with other GPS and energy balance
sensors which, in combination, can report corrected fluxes for CO
2
, latent heat
(H
2
O), sensible heat, ground surface heat flux, and momentum. The program
processes the EC data using commonly used corrections in the scientific
literature. For detailed information about downloading, installing, and
configuring the free program, refer to the
EasyFlux DL
manual located at
www.campbellsci.com/easyflux-dl
6.4.2 Datalogger Programming with
CRBasic
The datalogger of the EC150 is programmed in the
CRBasic
language, which
features two instructions for communication with the EC100 via SDM. The
first instruction is EC100(), which reads measurement data from the EC100.
The second is the EC100Configure(), which receives and sends configuration
settings.
With programs such as
EasyFlux DL
, there is little need for the user to become
well versed in the
CRBasic
language and the instructions required for
communicating with the EC100. In those cases in which it is needed or desired,
the Campbell Scientific website has several tutorials and guidance for learning
the
CRBasic
language. They can be accessed by entering CRBasic in the search
field at
7. Zero and Span
7.1 Introduction
Calibration of optical instrumentation like the EC150 may drift slightly from
the calibration that was performed in the factory with time and exposure to
natural elements. A zero-and-span procedure should be performed after
installation of the instrument to give appropriate baseline readings as a
reference. A zero-and-span procedure should also be performed occasionally to
assess drifts from factory calibration. In many cases, a zero and span can help
resolve problems that are being experienced by the user during operating the
EC150. For example, a zero-and-span procedure should always be performed
on the analyzer after changing the internal chemicals. Before performing a
zero-and-span procedure, clean the windows of the EC150 as described in
(p. 33)
.
After the first several zero-and-span procedures, the rate of drift in gain and
offset (explained later in this section) should be analyzed to better determine
how frequently the zero-and-span procedure should be performed once the
instrument has been put into service.
Summary of Contents for EC150
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Page 67: ...Appendix B Filter Bandwidth and Time Delay B 4 ...
Page 75: ...Appendix D Useful Equations D 4 ...
Page 76: ...E 1 Appendix E Safety Data Sheets SDS E 1 Molecular Sieve Type 13X ...
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Page 92: ...F 1 Appendix F Packing Information F 1 EC150 GH Packing Information ...
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