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Category: LI-8100A

Elizabethtown College Finds Novel Ways to Use Instruments for Classes and Research

Elizabethtown College Finds Novel Ways to Use Instruments for Classes and Research

Have you ever found yourself wishing that a fiction writer had a better grasp of scientific concepts? Dr. David Bowne at Elizabethtown College in Pennsylvania is doing his part to solve this problem—one student at a time—with a class called Ecology in Short Fiction. By providing literature students with experience with the LI-8100 Automated Soil CO2 Flux System, Dr. Bowne and his co-teacher Dr. Matt Skillen make ecological concepts meaningful to students in the context of fiction literature.

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LI-820, LI-840/A, LI-8100/A, and terrible, horrible, no good, very bad data

LI-820, LI-840/A, LI-8100/A, and terrible, horrible, no good, very bad data

There are four common causes for bad readings on LI-8xxx instruments:

  1. Incorrect zero and span calibration parameters.
  2. IR light source that is failing or has failed.
  3. Contamination (dirt, corrosion, liquids) in the optical path.
  4. Failed detector.

1)  Incorrect zero and span calibration parameters:

Check these values using the LI-COR interface software for each instrument by going to:

For LI-820 and LI-840, LI-840A: View – Calibration – Advanced

For the LI-8100, LI-8100A: Utilities…

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All About Timing! Determining Measurement Duration for Soil Flux Measurements

All About Timing! Determining Measurement Duration for Soil Flux Measurements

The LI-8100A SoilFluxPro™ software provides a tool to analyze the effect of observation length on measured flux values. The LI-8100A Automated Soil CO2 Flux System can be set up with varying measurement settings to account for the specific measurement conditions. A typical survey or long-term measurement consists of an observation length of 1.5 to 2.5 minutes, and a deadband of 20-30 seconds. However, these typical settings should be optimized for the specific measurement. This is especially true for measurements of…

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Testing the limits with the LI-8100A

Testing the limits with the LI-8100A

The LI-8100A is an automated soil flux measurement system that can be used to measure soil fluxes with varying rates of emission. While typical measurements are made on flux rates that range from 0.5 to 10 µmol CO2 m-2 s-1, the LI-8100A can be used to measure much higher fluxes with a small modification as discussed in Technical Note #136, or much lower flux rates with appropriate setup. There are different ways to characterize low flux detecting limit of measurements…

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Connecting and Programming Soil Moisture Probes with the LI-8100A

Connecting and Programming Soil Moisture Probes with the LI-8100A

LI-COR offers two soil moisture probes for use with the LI-8100A Automated Soil CO2 Flux System. The ThetaProbe model ML2x (Delta-T Devices Ltd., Cambridge, UK) and the ECH2O model EC-5 (Decagon Devices, Inc., Pullman, WA, USA) both provide a voltage signal that corresponds to the volumetric water content of the soil.  This value is a ratio, often expressed as θv = m3 H2O/m3 soil.  Among other things, soil moisture can help explain the magnitude of soil CO2 fluxes measured with…

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