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The new LI-7500DS analyzer delivers the performance and dependability of previous LI-7500 models, in a streamlined, lower cost configuration with even lower power requirements.
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Requiring only 4 watts during normal operation, the LI-7500DS features lower power demands than any other EC gas analyzer available. It is ideal for deployment in remote areas where power is limited.
Omnidirectional sampling provides versatile installation options and continuous data coverage.
Logs complete eddy covariance data sets—including wind speed measurements from a sonic anemometer and supporting meteorological, radiation, and soil data from a LI-COR Biomet System.
The SmartFlux® System runs EddyPro® Software on a powerful microcomputer to compute final flux results as data are logged. It delivers the same dependable results you get from EddyPro Software on a desktop computer, only computed in real time at the site.
Miniaturized electronics and simplified hardware make the LI-7500DS easier to use. This compact instrument delivers high-speed measurements and precision needed for flux measurements. Designed for long-term deployment, the LI-7500DS improves upon a proven platform.
The LI-7500DS uses non-dispersive infrared spectroscopy to measure CO2 and water vapor densities in air.
Infrared radiation is transmitted through temperature-controlled optical filters, then through the open sample path to a thermally regulated lead selenide detector. Some of the infrared radiation is absorbed by CO2 and water vapor in the sample path. Gas densities are computed from the ratio of absorbed radiation to a reference.
The accumulation of dust, pollen, chemical residues, and other contaminants on optics of open-path gas analyzers can lead to measurement drift and cause gaps in datasets. Typically, this is not a problem when an instrument is regularly maintained. If an instrument is not maintained, however, there is risk that this accumulation will affect measurements.
Innovations to the optics and electronics ensure that the LI-7500DS collects more accurate and dependable data—even as contaminants begin to accumulate on the optics.
Experimental data from 13 instruments at numerous sites with a wide range of contamination levels consistently show that the optical filters in the LI-7500DS provide significantly more stable measurements than the optical filters in the LI-7500A. Figures 1 and 2 show contamination-related drift data from an urban site adjacent to heavy road traffic.
Specifications subject to change without notice.
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