TriStar II 3020 Introduction
302-42828-01 - 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
not indicated on the screen and their respective causes and solutions are provided in the following
table:
What Happened Why What To Do
Vacuum pump is noisy. Sample tube connector is loose. Tighten fitting. Replace O-ring.
Sample tube O-ring is worn or
cracked.
Replace O-ring. Refer to
Replacing the Sample Tube O-
ring, page 9-6.
Sample tube is cracked. Replace with new sample tube.
No sample tube loaded on a
selected port.
Install plug or empty sample
tube.
Gas inlet valve open while
vacuum valve open.
With manual control enabled,
use the instrument schematic to
close gas inlet valve.
Analysis Dewar cannot be
raised (or lowered).
Elevator that moves Dewar is
stuck.
Check for possible obstruction
to elevator movement.
Analysis valves cannot be
operated.
Cable from computer to the
instrument is loose.
Make sure the cable is
connected properly
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