Advantages of the LI-7700 Open Path CH4 Analyzer

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CASE STUDIES

Dr. Jiquan Chen (University of Toledo) uses a mobile flux site which includes an LI-7700 Open Path CH₄ Analyzer and LI-7500A Open Path CO₂/H₂O Analyzer at Kellogg Biological Station in Michigan.

Dr. Jiquan Chen (University of Toledo) uses a mobile flux site at the Kellogg Biological Station in Michigan, which includes an LI-7700 Open Path CH₄ Analyzer and LI-7500 Open Path CO₂/H₂O Analyzer.

"As a technician, I'm impressed with [the LI-7700 Open Path CH₄ Analyzer's] robustness and ease of use." — Joe Verfaillie, Technician for Dr. Dennis Baldocchi (University of California, Berkeley)

Dr. Mario Tenuta (University of Manitoba) uses an LI-7700 Open Path CH₄ Analyzer, LI-7500A Open Path CO₂/H₂O Analyzer, and sonic anemometer for flux research in Churchill, Manitoba.

"The lack of access to micromet techniques for methane emission determinations has been a big gap... The LI-7700 will allow us to fill in that gap. The ability to do methane determinations without much power draw is really exciting to researchers." — Dr. Mario Tenuta (University of Manitoba)

"We are happy with the LI-7700 sensor when compared to closed path tunable diode laser systems... It gives us a sensor to deploy where the scientific questions are interesting, rather than where there are power lines." — Dr. Dennis Baldocchi (University of California, Berkeley)

The LI-7500 Open Path CO₂/H₂O Analyzer and the LI-7700 Open Path CH₄ Analyzer measuring flux in the Everglades National Park in Florida.

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-COR Advantage

Reliability

Field instruments require durability that bench-top instruments often lack. The LI-7700 was designed to make high quality measurements in extreme environments. Its lightweight design, low power requirement, and low maintenance operation make it ideal for demanding field deployments.

Science

LI-COR's scientists and engineers have collectively published and presented hundreds of posters, papers, and platform talks at scientific conferences and in scientific journals. Actively involved with the scientific community, they regularly collaborate with leading scientists around the world.

Support

For 40 years, LI-COR has developed innovative instruments and provided scientists with new tools for cutting edge research — and we will continue to do so. LI-COR operates with sound, enduring business principles, and you can count on us to support your LI-COR instruments for years to come.

Low Power Consumption
CH₄ Analyzer draws nominally 8W of power for use in locations without access to line power and without high CO₂ emissions from generators required with other systems.
High Speed
Data output rates to 40 Hz.
High Precision
RMS noise is 5 ppb at 10 Hz in typical ambient CH₄ concentrations (2 ppm).

System Integration
Connects directly to sonic anemometer and LI-COR CO₂/H₂O analyzer to log data files for quick flux calculations in EddyPro software.
Self Cleaning Optics
Monitors signal strength and actively cleans lower mirror when signal decreases below a user-defined limit to keep the instrument operating with less frequent field visits.
No Tubing Effects
Open path design means no pumps, no tubing sorption, and no tubing delays to complicate measurements.

LI-7700 Resources:

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Featured Publications:
- D. McDermitt, G. Burba, L. Xu, T. Anderson, A. Komissarov, B. Riensche, J. Schedlbauer, G. Starr, D. Zona, W. Oeschel, S. Oberbauer, and S. Hastings, 2010. A new low-power, open-path instrument for measuring methane flux by eddy covariance. Appl Phys B: Lasers and Optics, 102: 391-405.
- Matteo Detto, Joseph Verfaillie, Frank Anderson, Liukang Xu, Dennis Baldocchi, Comparing laser-based open- and closed-path gas analyzers to measure methane fluxes using the eddy covariance method, Agricultural and Forest Meteorology, Volume 151, Issue 10, 15 October 2011, Pages 1312-1324.
- 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.