LI-7500RS Open Circuit CO2/H2O Intelligent Analyzer

The LI-7500RS open circuit CO2/H2O intelligent analyzer is a new and reliable generation of open circuit CO2/H2O intelligent analysis system designed for rapid measurement of CO2 and H2O in atmospheric environments. Its low power consumption and almost maintenance free characteristics make it more suitable for long-term stable measurement at field observation stations.

open pathThe CO2/H2O gas analyzers LI-7500 and LI-7500A have been widely used in the field of global vorticity covariance carbon flux monitoring. More than 90% of the flux observation stations of the Global Carbon Flux Observation Network (FLUXNET) use LI-7500 or LI-7500A.

Working principle

The LI-7500RS uses non dispersive infrared spectroscopy to measure the density of CO2 and H2O in the air. Infrared rays pass through a temperature controlled filter and then through an open sampling space to reach the infrared detector. Specific wavelengths of infrared radiation are absorbed by CO2 and H2O in the sampling space, and the gas concentrations of CO2 and H2O are obtained by calculating the degree of infrared attenuation in that wavelength band.

New features of the instrument

lAccurate temperature control of the light source and detector ensures measurement stability even in large environmental temperature fluctuations.

lThe precise optical components greatly reduce its sensitivity to pollutants such as pollen, dust, etc. in natural environments.

lDesign of sapphire scratch resistant lenses with special light waves.

lHigh performance controllable temperature brushless chopper ensures long-term reliable operation.

lbuilt-inSMARTFluxTM system

SMARTFluxTM system integrates EddyPro ® The functionality of the software is brought to your field site, like a powerful field computer that can perform real-time and complete vorticity flux calculations. The calculation results are consistent with your use of EddyPro in the office ® The results obtained from processing raw data are exactly the same, but more timely. The SMARTFluxTM system is the hardware foundation of the FluxSuiteTM data online monitoring and management system.

main features

• ultrastability：Reliable vorticity covariance flux data can still be obtained under harsh environmental conditions.
• Maintenance free design：Redesigned optical components and added filter temperature control, completely outperforming various harsh outdoor environments, requiring almost no maintenance, still stable and drift free.
• Extremely strong adaptability to environmental temperature：Accurate temperature control of optical filters and detectors can ensure stable measurement when there are significant changes in ambient temperature.
• Continuous measurement in all directions:It can sample and measure airflow in various directions, allowing for multiple installation options and ensuring continuous data measurement.
• *Small interference:Installing it near the ultrasonic anemometer can minimize the impact of the instrument on the airflow, effectively avoiding data bias.
• Record complete vorticity covariance data:This includes wind speed data collected by ultrasonic anemometers and auxiliary meteorological, radiation, and soil data collected by the LI-COR Biomet system.