LI-COR LI-8100A - Page 79

5-8
User Calibration
you can do another secondary span at 2000 ppm. As long as the secondary span is
well away (in absorptance) from the previous normal span, it is OK to do as many
consecutive secondary spans at various concentration as you’d like.
To perform a secondary span, follow these steps:
Windows Software
A. Monitor the CO
2
and/or H
2
O concentrations in the main window of the
LI-8100A Windows interface software. When the concentration is stable
proceed to the calibration window.
B. Select Calibration from the Utilities menu.
C. Click on the Span 2 tab.
i. Enter the span gas concentration (CO
2
), or dew point (°C).
ii. Verify that the concentration in the main window is still stable. Allow
15-20 minutes for the H
2
O vapor concentration to stabilize near your
span point.
iii. Click on the Span 2 CO
2
or Span 2 H
2
O button.
iv. Click Yes to perform the calibration.
D. Click Close to exit the calibration screen.
Software for Apple iOS
A. Select Calibration from the Utilities menu.
B. Tap the Span 2 button.
i. Tap CO
2
or H
2
O.
ii. Verify that the concentration is stable. Allow 15-20 minutes for the
H
2
O vapor concentration to stabilize near your span point.
iii. Enter the span gas concentration (μmol/mol CO
2
), or dew point (°C).
iv. Tap Send Command.