By George Burba, Dan Anderson
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Extra resources for A Brief Practical Guide to Eddy Covariance Flux Measurements: Principles and Workflow Examples for Scientific and Industrial Applications
Flow the desired gas through the shroud. Allow from 10 to 30 minutes for equilibration, depending on flow rate. 5. Click the Zero CH4 button in the calibration frame. The Zero CH4 button will change to “Abort”. Clicking Abort terminates the zero procedure. It usually takes about 10 seconds to zero. 6. When the instrument completes the zero operation, a dialog box will open. You must choose either to apply the new calibration value or revert to the previous calibration value. Span setting: Span setting is essentially the same as a zero, except that you must flow the span gas through the optical path and enter the span gas concentration in parts per million (ppm).
Pdf LI-COR Biosciences | Brief Guide To Eddy Covariance Measurements 43 LI-7500A CALIBRATION • Factory determined calibration coefficients are good for years • The zero and span settings make the analyzer's response agree with its previously determined factory response at a minimum of two points • Calibration requires manual interaction because shroud must be inserted into optical path Factory determined polynomial calibration coefficients are usually good for several years. However, periodic setting of zero and span is recommended to make sure the instrument performs correctly.
5 m or more, but this will vary. As with all instrumentation in an eddy covariance flux system, the closer to the canopy they are, the closer the instruments must be to each other to minimize frequency response corrections for sensor separation. 50 For deployments high above the canopy, the LI-7700 should still be as close as is practical to the sonic anemometer, however larger vertical separations are now suitable (with the sonic anemometer above the LI-7700). For example, at heights of 40 meters above the canopy, the anemometer sample path could be above the LI-7700 entirely.
A Brief Practical Guide to Eddy Covariance Flux Measurements: Principles and Workflow Examples for Scientific and Industrial Applications by George Burba, Dan Anderson