Thermo Scientific Dionex ICS-5000, Руководство оператора

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Dionex ICS-5000 Operator’s Manual
218
Doc. 065342-06 12/11
Repeat two or three times. If the baseline does not improve, check the
other causes of baseline instability described in this section.
NOTE
To prevent air from becoming trapped in the cell in the
future, increase the backpressure on the cell by con-
necting backpressure tubing to the cell outlet. The
backpressure limit for the ED
cell is 690 kPa
(100 psi). Do not exceed this limit.
3. The water used to prepare the eluent may contain trace contaminants.
Remake the eluent, using ASTM Type I (18 megohm-cm) filtered and
deionized water that meets the specifications listed in
Section 1.5 .
8.3 Poor Retention Time Reproducibility
•
Liquid leaks
1. Check for leaks from the piston seals. Replace the piston seal on any
head with a leak (see Section 9.7 ).
2. Check for leaks throughout the remainder of the system, including the
check valves, injection valve, and columns. Tighten or replace fittings
as needed.
•
DP/SP not primed
Prime the pump (see Section 9.5 ).
•
Liquid lines incompletely flushed after an eluent change
Attach a 10 cc syringe (P/N 054578) to the waste port on the priming
valve. Open the priming valve (turn the knob one-half turn
counterclockwise). Draw at least 20 mL of the new eluent through the
liquid lines before operation.
•
Inoperative eluent proportioning valve (gradient pump only)
The proportioning valve assembly should be replaced. Contact Technical
Support for Dionex products for assistance.
Do not block the end of the cell outlet tubing for longer than the
recommended 2 to 3 seconds. Doing so creates high backpressure,
which can break the pH-Ag/AgCl reference electrode glass membrane.