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Minimizes data gaps with continuous measurements through rain, snow, and fog.
Improved optics and temperature controls increase long-term stability and reduce drift—even when the instrument is not cleaned for weeks at a time.
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—the same dependable results you get from EddyPro Software on a desktop computer, only computed in real time at the site.
SmartFlux is ready to connect with FluxSuite® Software — to put your eddy covariance system online. In FluxSuite, you can view results, get email notifications, and check the performance of your instruments from a computer and smartphone.
Specifically designed for long-term eddy covariance measurements, the LI-7200RS combines the ruggedness of a field–ready instrument with the precision needed for flux measurements.
Patented system of high-speed temperature and pressure measurements of the sampled air provide true mole fraction for the most accurate flux measurements.
Temperature-controlled source and detector for stable measurements—even in wide temperature fluctuations.
Precision optical components reduce sensitivity to contamination in dusty environments
Scratch-resistant sapphire lenses for simple cleaning in the field.
High-performance brushless chopper motor provides dependable long-term operation.
The LI-7200RS uses non-dispersive infrared spectroscopy to measure CO2 and water vapor densities in air. It transmits infrared radiation through temperature-controlled optical filters, then through the closed 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.
Using a patented configuration, the analyzer also measures temperature and pressure of the sampled air at high speeds—synchronously with the gas measurements. These data are combined to compute wet and dry mole fractions at speeds up to 20 measurements per second.
The following accessories are available for the LI-7200RS.
Included with each LI-7200RS, it houses the gas analyzer electronics, a 16 GB USB drive for data logging, and the SMARTFlux System. The LI-7750 has connections for a 3-dimensional sonic anemometer and provides Ethernet communication, making it easy to connect the LI-7200RS with FluxSuite Software.
Features an aerodynamic design that minimizes interference with wind flow to maximize frequency response, by minimizing flow distortion and dead volumes. A standard component of the LI-7200RS, the inlet cap is compatible with both the insulated intake tube and optional heated intake tube.
Two 2-micron Swagelok® particle filters are included with each LI-7200RS. Compatible with both the insulated and heated intake tubes, the filter reduces the need to clean the intake tube and gas analyzer cell, improving the stability of measurements in dusty environments.
Efficient and durable, the Flow Module provides a precisely controlled airflow rate through the LI-7200RS optical path. With precise flow measurements and controls, it actively regulates the flow to ensure stable and consistent airflow rate.
Outputs flow rate, pressure drops, and diagnostic data to indicate when filters need to be cleaned or replaced.
Included with each LI-7200RS, the insulated intake tube is ideal for measurements in dry environments with low to moderate humidity.
The optional heated intake tube is recommended for humid environments. It improves frequency response of water vapor measurements by preventing water vapor sorption to the intake tube walls.
The accumulation of dust, pollen, chemical residues, and other contaminants on the optics of an unfiltered enclosed gas analyzer can lead to measurement drift and cause gaps in datasets. This is not a significant problem if an instrument is filtered and regularly maintained. If an instrument is unfiltered or not maintained, however, there is risk that contaminants will affect measurements.
Innovations to the optics and electronics ensure that the LI-7200RS collects more accurate and dependable data—even as contaminants begin to accumulate on the optics.
Data from 13 instruments at 5 sites—with exposure to different levels of contamination—consistently show that the LI-7200RS provides more stable water vapor measurements than the original LI-7200 (Figure 1). CO2 measurements (not shown) are similar to or slightly better than those of the LI-7200.
Although the absence of fast air temperature and pressure measurements may appear negligible on half-hourly fluxes, the problems become apparent when computing carbon budgets (Figure 3), which can accrue large differences.
Specifications subject to change without notice.
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