Chromatographic Troubleshooting
Troubleshooting valve systems
214
Troubleshooting valve systems
Chromatographic symptoms
Troubleshooting valves and their related plumbing is primarily a matter
of systematic checking and verification of unimpaired mechanical
operation of any moving part. This requires an understanding of how the
valve functions internally and how the plumbing is configured. A
plumbing diagram is essential for effective troubleshooting.
The following symptom•causelist gives the most commonly encountered
problems and solutions found with valves.
Loss of sensitivity or excessive drift
Several possible causes exist for overall deterioration of the
chromatogram.
Contamination in the valve requires a thorough cleaning.
Internal leakage necessitates a complete disassembly and
inspection of the mating surfaces.
Poor temperature control may require a full check of electronic
and thermal components.
Lack of proper conditioning techniques, columns, etc.
Failure or deterioration of other components (i.e., columns,
detectors, etc.).
