The LI-7700 Open Path CH4 Analyzer and LI-7200 Enclosed CO2/H2O Analyzer used in a flux station by Dr. John Grace in Edinburgh, Scotland.
The LI-7200 Enclosed CO2/H2O Analyzer, a sonic anemometer, and the LI-7700 Open Path CH4 Analyzer at a flux site near Mead, Nebraska.
The LI-7700 Open Path CH4 Analyzer and LI-7200 Enclosed CO2/H2O Analyzer covered in frost at an ICOS test site in a boreal wetland in Finland.
The LI-7200 at a FLUXPYR Interreg-Poctefa Project meteorological station in Spain.
The LI-7200 is a compact, enclosed CO2/H2O analyzer that combines the benefits of open and closed path gas analyzers. It is an integrated system designed to provide measurements in harsh weather conditions and environments, with impressively low power consumption.
The LI-7200 includes the LI-7550 Analyzer Interface Unit — a weatherproof enclosure that houses the Digital Signal Processing (DSP) electronics. 4 analog input channels and on-board USB data storage allow the LI-7500 to log complete eddy covariance data sets (CO2, H2O, U, V, W, and Ts, and other variables). Ethernet and Serial data are output at selectable speeds of up to 20 Hz, and linearized user-configurable Digital-to-Analog Converters (DACs) output analog signals at up to 20 Hz bandwidth.
The 7200-101 Flow Module (optional) is an energy efficient, durable unit designed to provide a precisely controlled airflow rate through the LI-7200 optical path. With precise, intelligent feedback controls, the flow module actively regulates flow to ensure a stable, carefully monitored airflow rate.
The 7200-101 Flow Module outputs mass flow rate, volumetric flow rate, and pressure drops with the data record, and provides diagnostic data to indicate when filters need to be cleaned or replaced.
The LI-7200 makes fast, precise CO2 and H2O measurements that allow you to capture small density changes at high speeds, over a wide range of concentrations.
The LI-7200 outputs fast mixing ratio, which significantly improves and simplifies flux calculations and improves CO₂ budget estimates. 
The LI-7200 can be used in remote locations without access to mains power, so you can make flux measurements where you want without being limited by infrastructure. Image credit: Fluxpyr
The LI-7200 provides high quality data regardless of wind direction when used with omni-directional sonic anemometers.
The LI-7200 makes continuous measurements through rain, snow, and fog, so you have fewer, smaller data gaps. 
The LI-7200 analyzer mounts atop flux towers so it can be used with a short intake tube optimized for eddy covariance measurements.
LI-7200 Resources:
- Featured Publications:
- Burba, G., A. Schmidt, R. Scott, T. Nakai, J. Kathilankal, G. Fratini, C. Hanson, B. Law, D. McDermitt, R. Eckles, M. Furtaw, and M.Velgersdyk, 2012. Calculating CO2 and H2O eddy covariance fluxes from an enclosed gas analyzer using an instantaneous mixing ratio. Global Change Biology, 18(1): 385-399
- Sigrid Dengel, Peter E. Levy, John Grace, Stephanie K. Jones, and Ute M. Skiba (2011), Methane emissions from sheep pasture, measured with an open-path eddy covariance system. Global Change Biology, Volume 17, Issue 12, pg 3524-3533.
- Nakai T, Iwata H, Harazono Y, 2011. Importance of mixing ratio for a long-term CO2 flux measurement with a closed-path system. Tellus B, DOI: 10.1111/j.1600-0889. 2011.00538.x