Thermo Scientific Dionex ICS-5000 Operator's Manual page 231

5. Prepare fresh eluent. To ensure eluent purity, prepare all eluents with
spectro-grade eluents, reagent-grade chemicals, and ASTM Type I
(18 megohm-cm) filtered and deionized water that meets the
specifications listed in
•
DP/SP not properly primed
Prime the pump (see
•
Piston seal is damaged
If the piston seal is damaged, it allows liquid leaks. Leaks are usually
visible, and thus easily detected. If necessary, replace the piston seal (see
Section
•
Inadequate system or cell backpressure
Add backpressure tubing to the cell outlet (see
pump (if no column is installed).
•
(Analytical EG only) System backpressure is below 14 MPa (2000 psi)
The optimal system backpressure is 16 MPa (2300 psi) in an analytical IC
system with an EG installed,. Low system backpressure may cause high
baseline noise as the eluent concentration increases in the gradient. To
correct this, install a backpressure coil in the EG after the RFIC Eluent
Degasser (see
•
Flow system leak ahead of cell
Check all fittings and liquid lines for leaks. Tighten or, if necessary,
replace all liquid line connections (see
•
Rapid changes in ambient temperature
Make sure the column is installed in a thermostatically controlled
compartment and the compartment 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.
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Section
Section
9.7).
Section 9.17).
1.5.
9.5).
Section
Section 9.19).
8 • Troubleshooting
9.27.4) or to the
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