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Tag: LI-840

Troubleshooting RS-232 Connectivity Issues for LI-COR Analyzers

Troubleshooting RS-232 Connectivity Issues for LI-COR Analyzers

Many LI-COR gas analyzers feature RS-232 communication ports, and sometimes these are the only communication channels available between the gas analyzer and a computer. Many new computers don’t have built-in serial ports, so USB-to-serial adapters are needed to facilitate this communication process. Communication problems between gas analyzer and windows interface software can happen due to issues with the USB to serial adapter or due to the lack of compatibility between the instrument firmware version and the windows interface software version. Terminal…

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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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