Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 332
Valves
Most of the problems associated with sampling
valves are related to peak broadening in transfer
lines and inlets, sample absorption by the valve
or transfer lines, leaks, and perturbations in the
baseline.
Chromatographic symptoms
Troubleshooting valves and their related plumb-
ing is primarily a matter of systematic checking
and verification of unimpaired mechanical opera-
tion of any moving part. This requires an under-
standing of how the valve functions internally
and how the plumbing is configured. A plumbing
diagram is essential for effective troubleshoot-
ing.
The following “symptom-cause” list gives the
most commonly encountered problems found with
valves and their solution.
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