LI-840 Calibration
The LI-840 does not require factory recalibration, which saves time and money. The LI-840 does require occasional user calibration (setting the zero and span). A zero and a span gas are required for CO2. For H2O an airstream of known dew point to set the span is required. The LI-610 Dew Point Generator can be used for the H2O calibration procedure. The calibration procedure is done using the Windows® software or the XML communication protocol.
