CS IRGASON, Instruction Manual

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IRGASON
®
Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
2
o The SDM, USB, and RS-485 output options include IRGASON
diagnostic data. Be aware that the absence of diagnostic data in
the analog output option could make troubleshooting difficult and
may lead to the user not being aware of potential problems with
the instrumentation (see Section 8 , EC100 Outputs
(p. 22)
).
o Resting the analyzer on its side during the zero-and-span
procedure may result in measurement inaccuracy.
o When cleaning the gas-analyzer window, make sure the alcohol
and any residual water completely evaporate before proceeding
with the zero-and-span procedure (see Section 9.3 , Gas-Analyzer
Window Cleaning
(p. 28)
).
3. Initial Inspection
Upon receipt of the IRGASON, inspect the packaging and contents for
damage. File damage claims with the shipping company.
4. Overview
The IRGASON is an in-situ, open-path, mid-infrared absorption analyzer
integrated with a three-dimensional sonic anemometer. The gas analyzer
provides measurements of absolute densities of carbon dioxide and water
vapor, while the sonic anemometer measures orthogonal wind components.
The IRGASON is measured and controlled by the EC100 electronics, which
synchronizes gas and wind data, essential for valid flux calculations using the
eddy-covariance method. The EC100 electronics also uses inputs from an
included temperature thermistor probe and a barometer. “IRGASON” and
“EC100” are often used interchangeably in this manual.
The IRGASON has been optimized for remote eddy-covariance- flux
applications, addressing issues of aerodynamics, power consumption, spatial
displacement, and temporal synchronicity. Specifically, its unique design
contains no obstructions surrounding the sample volume; it operates with only
5 Watts of power at room temperature; it has no spatial displacement between
the sample volumes of the gas analyzer and the sonic anemometer; and the
EC100 synchronously samples data from the gas analyzer and sonic
anemometer.
5. Specifications
5.1 Measurements
Features
•
To compute carbon dioxide and water vapor fluxes using the eddy-
covariance method, the IRGASON measures:
o absolute carbon dioxide
o water vapor densities
o three-dimensional wind speed
o
sonic air temperature
o air temperature
o barometric pressure