LI-COR LI-7820, Instruction Manual

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Section 1.
Introduction to the LI-7820
The LI-7820 N
2
O/H
2
O Trace Gas Analyzer is a high-precision, high-stability, laser-
based gas analyzer that uses Optical Feedback — Cavity-Enhanced Absorption Spec-
troscopy (OF-CEAS) to measure gases in air. OF-CEAS is a well-established spec-
troscopic technique that is described in published literature. The analyzer reports
and stores in its internal memory N
2
O dry mole fractions in air corrected for both
the spectroscopic interferences and dilution due to H
2
O. See Measurement overview
on page A-1 for a brief summary of OF-CEAS.
What's what
If you have just taken delivery of the instrument, check your packing list to be sure
you received everything that you ordered. The LI-7820 includes some or all of the
following components.
Gas analyzer
The gas analyzer is in a gray enclosure. It is designed for indoor and outdoor use
but it is not waterproof.
1-1 LI-7820 N₂O/H₂O Gas Analyzer