Open Path CH4 Analyzer - LI-COR

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The LI-7700 Open Path CH 4 Analyzer - Eddy Covariance System Page 93-Gas Eddy Covariance SystemFor a multi-gas system, the LI-7550 Analyzer Interface Unit can be used to integrate an LI-7700, aCO 2 /H 2 O analyzer such as the LI-7500A Open Path CO 2 /H 2 O Analyzer or LI-7200 Enclosed CO 2 /H 2 OAnalyzer and a sonic anemometer. When using the LI-7700 to calculate methane flux, it is criticalthat a high speed H 2 O analyzer be used for water vapor correction.The figure below shows methane, carbon dioxide, and latent heat fluxes measured with the eddycovariance technique over the Florida Everglades. These data are a subset of a 6-week data setcollected during the winter of 2008-09, at 3.15 m above the canopy, using an LI-7500 Open PathCO 2 /H 2 O Analyzer and an LI-7700 Open Path CH 4 Analyzer. They show a net negative flux of CO 2 ,but positive CH 4 and LE fluxes for the measurement period, indicating that this ecosystem was a sinkof carbon dioxide and a source of methane and water vapor.CH 4Flux (mg/m 2 /h)CO 2Flux (g/m 2 /h)5.0 0.31202.5 0.150-2.5 -0.15-5.0 -0.3-120338 339 340 341 342 343 344 345 346Day of Year600-60LE (W/m 2 )Both the LI-7700 Open Path CH 4 Analyzer and the LI-7550 Analyzer Interface Unit provide fourgeneral ±5 V inputs for analog data from any fast sonic anemometer. The LI-7700 also provides threetype E thermocouple inputs for recording additional temperature data if desired. LI-COR sonic anemometercables (optional) allow you to easily integrate analog data from Gill WindMaster/Pro orCampbell ® Scientific CSAT-3 sonic anemometers with the LI-7700 data stream. Weatherproof cableterminals provide simple and reliable electrical connections.Greenhouse Gas Pacakges from LI-COR:Greenhouse gas analyzer systems from LI-COR Biosciences facilitate the collection of eddy covariancedata sets by logging CH 4 , CO 2 , and H 2 O density data, along with wind speed, direction, andtemperature data (u, v, w, and T s ) to a removable USB data storage device. Data can also be transferredvia Ethernet to an external data storage device or computer network.LI-COR offers two Greenhouse Gas Packages which include the LI-7700 CH 4 Analyzer with eitherthe LI-7500A Open Path CO 2 /H 2 O Analyzer or LI-7200 Enclosed CO 2 /H 2 O Analyzer. Sonic anemometerscan also be purchased from LI-COR.
For use with:• LI-72 0 CO2/H2O Analyzer• LI-75 0A CO2/H2O• LI- 7 0 CH4 AnalyzerThe LI-7700 Open Path CH 4 Analyzer - Eddy Covariance System Page 10Typical Eddy Covariance ConfigurationCH 4 AnalyzerIntegrates easily into new or existing towers.CO 2 /H 2 O AnalyzerLI-COR’s LI-7500A Open Path Analyzer (shown in thediagram) and LI-7200 Enclosed Analyzer make precise,accurate, and fast measurements. A CO 2 /H 2 O analyzeris a core component of a flux tower.Sonic AnemometerMeasures wind speed and direction. LI-COR’s flexiblesystem allows for the integration of any sonic anemometerthat has analog outputs.The LI-7550 Analyzer Interface UnitUsed for data acquisition from the LI-7700, as well as dataacquisition and control of the sonic anemometer and CO 2 /H 2 Oanalyzer. Data can be output through Ethernet, or stored internallyon a removable industrial-grade USB drive.7700-101 Washer Assembly (included)Supplies washer fluid for automated washingof lower mirror surface.Solar PanelsWith low power requirements (nominally 8W for LI-7700, 20Wfor LI-7700 and LI-7500A), LI-COR’s system can be easilyoperated on solar panels and batteries.
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Open Path CH4 Analyzer - LI-COR

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