LI-COR LI-8100A - Using Chemical Scrubbers; Setting the Span: CO

5-4
User Calibration
C. Tap the Zero button.
i. Enable H
2
O.
ii. Verify that the H
2
O concentration is stable.
iii. Tap the Send Command button.
Using Chemical Scrubbers
1. Prepare Chemical Tubes.
Fill each tube with the proper chemical. Ensure that air flows freely through
the tube.
2. Verify that the LI-8100A pump is turned on.
3. Plumb the LI-8100A.
A. Attach a chemical tube containing either Soda Lime or Drierite to the air
inlet.
B. Vent the instrument outlet to the atmosphere.
4. Calibrate
Follow step #3 from "Setting Zero: CO
2
and H
2
O, Using a Calibrated Tank of
Zero Gas."
Setting the Span: CO
2
Note: Set the span only after setting the zero.
1. Plumb the LI-8100A
A. Attach a tank containing a known concentration of CO
2
to the
LI-8100A air inlet.
B. Vent the instrument outlet to the atmosphere.
C. Turn off the pump, if it is on, and set flow from tank at 0.5 l/min.
2. Monitor CO
2
concentration.
When CO
2
concentration is stable proceed to the next step. Allow 1-2 minutes
for the CO
2
concentrations to stabilize.
3. Calibrate
Windows Software
A. Select Calibration from the Utilities menu.
B. Click on the Span tab.
i. Enter the span gas concentration (ppm).
ii. Verify that the CO
2
concentration is stable.
iii. Click on the Span CO
2
button.