Performing a Reference Analysis
Gemini VII 2390 Confirm
68 Gemini VII 2390 Confirm Installation Instructions and Checklist
Feb 09
Preview
is the destination, then click
OK
.
c. Click
Start
; the User Log in dialog is displayed.
d. Enter your password in the
Password
field, then click
OK
to start the analysis.
4.
When the analysis is complete, compare the BET Surface Area shown in the report with
the BET Surface Area shown on the reference material bottle.
• If your results are within tolerance, your instrument is operating properly.
• If your results are not within tolerance, refer to the following table for possible causes
and actions. After performing the action, perform the reference 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. Refer to
“Cleaning and Verifying the Gas Lines”
on page 44)
The measured free space is too high. This
indicates the helium may not be pure
enough.
Be sure your helium is 99.999% pure.