Service Discontinuation Notice

Factory repair services for the original LI-7500 will end on December 31, 2024. If you have an original LI-7500 (serial number below 75H-1900): 

  • Schedule factory service for your LI-7500 before December 31, 2024.
  • Order the preventive maintenance package, which includes a new optical source, new chopper motor, and factory recalibration. The preventive maintenance package will be installed at the service center in Lincoln, NE (available until December 31, 2024).

Service on the original LI-7500 was initially scheduled to end on December 31, 2023, however due to demand, we are extending the date to December 31, 2024. The LI-7500A, LI-7500RS, and LI-7500DS are not affected.


LI-7500 CO2/H2O Analyzer Instruction Manual

Instruction Manual for the original LI-7500.

Using the LI-7500A/RS? Look here instead.


LI-7500 Open Path CO2/H2O Analyzer Instrument (Embedded) Software v3.0.1

Instrument (embedded) software for the LI-7500 Open Path CO2/H2O Analyzer.

LI-7500 Open Path CO2/H2O Analyzer Windows Interface Software v3.0.2

Windows interface software for the LI-7500 Open Path CO2/H2O Analyzer.


Frequently Asked Questions

All Documents

7500-600 LI-7500 Head Upgrade Kit instructions Instructions for upgrading the LI-7500 sensor head to the LI-7500A. install guide
LI-7500 CO2/H2O Analyzer Software Update Instructions for Instrument (embedded) and Windows Interface Software Instructions for updating the instrument (embedded) and Windows interface software for the LI-7500 Open Path CO2/H2O Analyzer. install guide
Solution for Minimizing Surface Heating Effects for Open Path CO2 Flux Measurements in Cold Environments Poster describing how to minimize potential effects of surface heating in open path CO2/H2O analyzers. poster
Additional Heat Flux Term in the WPL Correction for the Open-path Gas Analyzer Poster describing an additional term in the WPL corrections that can correct for instrument-related heat dissipation. poster
Effects of temperature and pressure on CO2 infrared absorption with special emphasis on problems resulting from operation at high flow rates. Article describing the effects of temperature and pressure on absorption of infrared energy by carbon dioxide. publication
Effects of Temperature, Pressure, and Water Vapor on Gas Phase Infrared Absorbtion by CO2 Article that describes the effects of temperature, pressure, and water vapor on absorption of infrared energy by carbon dioxide. publication
Using the Sable Systems DG-4 to set the H2O span for LI-COR gas analyzers You can adjust the H2O span in many LI-COR gas analyzers with a dewpoint generated by the Sable Systems DG-4 Dewpoint Generator. This tech tip provides some details. tech tip
LI-7500 CO2/H2O Analyzer Communication Issues Technical Note/FAQ about communication with the LI-7500. tech tip
LI-7500A CO2/H2O Analyzer's Red LED Power Light Stays On Technical Note/FAQ about problem with red LED power light not turning off on the LI-7500. tech tip

Factory Service and Recalibration

To request factory service or recalibration for an instrument:

Service will be performed at our US office in Lincoln, NE USA, European office (LI-COR GmbH), or by your local distributor.