LI-COR LI7200RS, Instruction Manual

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Calibration Window Overview
The LI-7200RS uses a fifth order poly-
nomial for the CO
2
calibration, and a third order polynomial for the H
2
O cal-
ibration. Step-by-step instructions for calibrating the gas analyzer can be found in
User Calibration on page 4-1.
The
Calibration
window is where you set the zero and span of the instrument.
There are entry fields to set the target values for the span gases used to set the span
of the instrument; CO
2
span gas target values are in ppm, and H
2
O span gas target
values are entered in °C dewpoint. The Zero and Span tabs also provide inform-
ation about the stability of the gas flowing through the optical path:
l
A green flag indicates that it is OK to perform the calibration
l
A red ‘X’ indicates that it is not OK to perform the calibration; wait until the
red ‘X’ changes to a green flag before performing the calibration.
Section 7. Software Reference
7-21 Calibration Window Overview