ICS-900 Operator’s Manual
60 Doc. 065215-02 9/09
4.7 Excessive System Backpressure
• Restriction in system plumbing
Check all liquid lines for crimping or blockage. Make sure the ferrule fittings
are not overtightened onto tubing. Refer to Installation of Dionex Liquid Line
Fittings (Document No. 031432) for details. The manual is included on the
Dionex Reference Library CD-ROM (P/N 053891).
• Plugged or damaged fitting
Isolate the faulty fitting by loosening fittings, one by one, until the pressure
returns to normal. Repair or replace the fitting (see Section 5.2
).
• Flow rate through columns too high
Check the pump flow rate.
• Clogged column bed supports
Refer to the instructions in the column manual for troubleshooting guidance.
Column manuals are included on the Dionex Reference Library CD-ROM
(P/N 053891).
• Contaminated columns
Clean the columns as instructed in the column manual. Column manuals are
included on the Dionex Reference Library CD-ROM (P/N 053891).
• Plugged Injection valve passages
Rebuild the injection valve (see Section 5.10
).
4.8 Peak “Ghosting”
Ghosting is the appearance of extraneous peaks in a chromatogram. These may be
late-eluting peaks from a previous injection or they may result from a
contaminated, malfunctioning, or incorrectly installed injection valve. These
peaks may co-elute with peaks of interest, resulting in nonreproducible peak
heights/areas.
• Insufficient time between sample injections
Wait until the previous sample has been completely eluted before making
another injection.
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