Open Path CO2/H2O Gas Analyzer

The next generation of the most trusted open path CO2/H2O analyzer for carbon dioxide flux and evapotranspiration measurements.

The LI-7500DS is designed for high-speed CO2 and water vapor measurements in ambient air. Lower power and maintenance requirements make it ideal for field deployments. 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 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.

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