ICS-90 Ion Chromatography System
4-10 Doc. 031851-05 12/04
4.13 Baseline Noise or Drift
• Flow system leak; erratic baseline
Check all fittings and liquid lines for leaks. Tighten or, if necessary, replace
all liquid line connections. Refer to Installation of Dionex Liquid Line Fittings
(Document No. 031432) for tightening requirements.
• Trapped gases
Release any trapped gases in the cell by loosening the lines to and from the
cell and then retightening them. Also loosen and retighten the fittings to and
from the MMS eluent ports.
• Pump not properly primed
Prime the pump (see Section B.13
).
• Contaminated or incorrect eluent and/or regenerant
Remake the eluent and regenerant (see Section 3.1
).
• Rapid changes in ambient temperature
If the ambient temperature does not meet the specification of 10 to 35 °C (50
to 95 °F), make sure that air conditioning and heating vents are directed away
from the ICS-90 and the ICS-90 front door is closed.
• Insufficient system equilibration following changes to operating
parameters; especially apparent when operating at high sensitivities
Allow a longer system equilibration time (up to 2 hours) before starting
operation.
• Incorrect suppressor operating conditions
Refer to the suppressor manual for troubleshooting information.
• Cell above or below temperature
Call Dionex for assistance.
• Damaged piston seal
Replace the piston seal (see Section 5.6
).
• DCR backpressure tubing not installed
Install the tubing on the end of the suppressor waste line (see Section B.8
).
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