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Dionex VWD Operator's Manual
•
Worn or damaged column
Replace the column.
4.8
Poor Reproducibility
Poor reproducibility is generally caused by a system-level problem and is not
related to detector performance. Some examples of system-level problems that
may cause poor reproducibility follow. Refer to the system manual or individual
module manual (autosampler, pump, etc.) for additional causes and
troubleshooting information. System and module manuals are shipped on the
Thermo Scientific Reference Library DVD (P/N 053891).
•
The autosampler is drawing air from the vial, or there are air bubbles in the
syringe.
•
Sample carryover is occurring.
•
There is air in the flow path.
•
Fitting connections to the tubing are not tightened properly.
•
The pump piston seals need to be replaced.
•
The mobile phase is not properly degassed.
•
The sample is unstable.
•
The gradient is not reproducible.
•
The environmental conditions (temperature and/or humidity) are fluctuating.
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