Factory Calibration

Recommended Recalibration Frequency for the LI-6400 and LI-6400XT: Every two years. Note that the analyzers drift very little during this time frame. The most important reason to return the instrument to the factory is for thorough system testing and maintenance.

What's included with LI-6400/XT recalibration?

A factory recalibration includes the following:


  • H2O calibration (6 points, 3 temperatures).
  • CO2 analyzer calibration (13 gas concentrations at 3 temperatures).
  • Flow meter calibration (7 different flow rates at 3 temperatures).
  • Pressure transducer calibration.
  • Temperature sensors (block, air, leaf).
  • Quantum sensors (internal and external, if requested, at additional charge).
  • LED source (if requested, at additional charge).

Tests and Maintenance

  • Test CO2 injector for flow and stability.
  • Test pressure drop on chemical tubes, repair tubes if needed.
  • Clean sensor head, if needed.
  • Change detector housing chemicals.
  • Check and repair any air leaks in the system (inform customer of leaks found).
  • Check gaskets and chamber Propafilm™, replace as needed.
  • Lithium coin cell battery changed as needed.
  • Replace internal air filter.
  • Replace hoses and other air supply parts as needed.
  • Upgrade software to the most recent version (user files should not be affected, but please download a copy of all important files before sending to LI-COR).
  • Other repairs and maintenance as needed; customers are notified if additional fees are required for repairs.

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.