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.
LI-7200 Key Features
- Based on the proven LI-7500
- High speed in-cell temperature and pressure measurements
- Low power requirements:
12 W nominal, <30 W nominal
with the 7200-101 Flow Module - High precision:
- 0.16 ppm CO2; 0.0067 ppt H2O typical
- RMS noise in ambient conditions @ 20 Hz
- Continuous measurements through rain, snow, and fog
- Analyzer mounts atop flux towers for minimal tubing attenuation of CO2 and H2O
- 90-95% temperature attenuation
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-7500A 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.
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
- Clement, R., G. Burba, A. Grelle, D. Anderson, and J. Moncrieff, 2009. Improved trace gas flux estimation through IRGA sampling optimization. Agricultural and Forest Meteorology, 149 (3-4): 623-638
- 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