Micromeritics Gemini VII 2390a, Operator'S Manual

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Gemini VII Introduction
239-42828-01 - Dec 2012 9-1
9. TROUBLESHOOTING AND MAINTENANCE
Introduction
The analyzer has been designed to provide efficient and continuous service; however, certain mainte-
nance procedures should be followed to obtain the best results over the longest period of time. This
chapter includes maintenance and calibration procedures.
Troubleshooting
Most operational problems are caused by:
• Leaks (commonly around the sample tube O-ring at the analysis port)
• Sample weighing errors
• Use of too much analysis bath fluid in the Dewar at the start of an analysis
• Entry of incorrect system volume for analysis
• Impure gas supply

When unexpected analysis results occur, check the above first. Some common operational problems
that are not indicated on the screen and their respective causes and solutions are provided in the fol-
lowing table:6
What Happened Why What To Do
Specified pressure not
reached. Sample or balance tube not
properly attached. Reattach sample and balance
tubes. Ensure both are securely
attached to ports. Replace O-
rings if defective. Refer to
Replacing Port Filter (Frit)
and O-ring
, page
9-6
.
Leak in gas line. Perform the Adsorptive and
Helium Line tests to determine if
a leak exists. Refer to
Diagnostics
, page
6-17
.