Note on Infrared Source Replacement
The infrared source in the LI-840A is rated for more than 18,000 hours of life. Should the source
fail, a replacement can be obtained from LI-COR Biosciences. The source can be replaced in the
field; however, it should be noted that changing a source has the potential of degrading the
accuracy specification for CO
2
to as much as 3% of reading. The H
2
O channel should remain
within the published specification.
If the source fails, the instrument can be returned to LI-COR Biosciences for replacement and
factory recalibration. This will ensure that the accuracy stays within the factory specifications.
Alternatively, if you have two span gasses, you can adjust the calibration yourself. See Two Point
Span (Span 2 Tab) on page3-26.
Section 5
5-6 Section 5. Maintenance
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