7 Operational Verification
12. Click Browse. Locate and select the sample file created previously for this analysis. Click
Open.
a. Click Report After Analysis.
b. Select Report after analysis and Preview as the destination. Click OK.
13. Click Start.
14. Compare the BET Surface Area in the report with the BET Surface Area on the reference
material bottle.
n If results are within tolerance, the analyzer is operating properly.
n If results are not within tolerance, refer to the following table for possible causes and
actions. After performing the action, perform the reference material analysis again.
Cause Action
The sample was not degassed properly.
Degas the sample again.
The gas lines are not clean.
Clean and verify the gas lines.
The measured free space is too high.
This indicates the helium may not be
pure enough.
Helium must be 99.995% pure.
7 - 4
Gemini VII 2390 Installation Instructions and Checklist
239-42870-02 Rev (B) — May 2021
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