Campbell Scientific IRGASON IRGASON Integrated CO2/H2O Open-Path Gas Analyzer - Page 12
Initial Inspection, 4. Overview, 5. Specifications, 5.1 Measurements
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IRGASON® Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer 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). 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). 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 eddycovariance 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 2