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Month: January 2009

LI-7500 Communications: Wrong Serial Cable?

LI-7500 Communications: Wrong Serial Cable?

Most Eddy Covariance Flux Systems use the LI-7500 CO2/H2O Analyzer in conjunction with a Campbell Scientific Data Logger. The Campbell Data Logger communicates with a computer using a straight through type serial cable. This means pin 2 connects to pin 2, pin 4 to pin 4, etc. LI-COR, however, uses a combination of two serial cables for calibrating the LI-7500 CO2/H2O Analyzer, and for observing real-time values; a standard null modem cable (part no. 9975-016), and a second null modem…

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Calibrating the LI-7000 for Eddy Covariance Measurements

Calibrating the LI-7000 for Eddy Covariance Measurements

Many customers use a closed-path Analyzer (such as the LI-7000 CO2/H2O Analyzer) for making Eddy Covariance measurements. When employing this method of measurement, the user will typically use a pump downstream of the analyzer. The pump will pull air (typically between 8 and 15 liters per minute) from the sampling site where the sonic anemometer is located. The sample is drawn through a length of tubing from the sample site to the analyzer’s inlet port. The tubing will vary in…

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Conserving Power When Using the LI-8100

Conserving Power When Using the LI-8100

When using the LI-8100 Automated Soil CO2 Flux System, you may need to collect Soil CO2 Flux measurements over an extended period of time. In either Survey or Single Chamber Long-Term mode, conserving power can be an issue. LI-COR has developed a few tips on how to extend battery life in both configurations.

Using the LI-8100 System for Survey Measurements with a Survey Chamber (8100-102 or 8100-103)

When making attended measurements at multiple soil collar locations, you can use the…

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LI-6400 featured in NOVA series video

LI-6400 featured in NOVA series video

The PBS NOVA series “Hunting The Hidden Dimension” featured a story about a team of American scientists who traveled to a rain forest in Costa Rica to employ fractal geometry to see how much CO2 the rain forest can absorb. The LI-6400 Portable Photosynthesis System is used to measure how much carbon a single leaf can hold, which will then help the scientists predict how much carbon the whole tree can…

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The IYA, a Very Big Telescope, James Bond, and the LI-7500

The IYA, a Very Big Telescope, James Bond, and the LI-7500

Telescope

2009 is being celebrated as the International Year of Astronomy (IYA), marking the 400 year anniversary of the first use of an astronomical telescope by Galileo Galilei. On August 25, 1609, Galileo demonstrated hs first refracting telescope (about 3x magnification) to lawmakers in Venice, Italy. Even Galileo himself would most certainly be shocked at how far his initial invention has progressed in 400 years, given that a single optical…

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