Dionex ICS-90 - 4.2 Liquid Leaks

ICS-90 Ion Chromatography System
4-4 Doc. 031851-05 12/04
4.2 Liquid Leaks
• Leaking fitting
Locate the source of the leak. Tighten or, if necessary, replace the liquid line
connection (see Section 5.2
). Refer to Installation of Dionex Liquid Line
Fittings (Document No. 031432) for tightening requirements.
• Broken liquid line
Replace the line and fittings (see Section 5.2
).
• Blocked or improperly installed line
Make sure the lines are not crimped or otherwise blocked. Also, if the blocked
line is a waste line, make sure it is not elevated at any point after it exits the
ICS-90. If a line is blocked, replace it (see Section 5.2
).
• Loose pump check valve housing
Make sure the check valves are firmly seated in the pump head. If they are
not, tighten them carefully with an open-end wrench just until the leak stops.
• Damaged pump piston seal
1. Replace the piston seal (see Section 5.6
).
2. If the problem persists, replace the piston (see Section 5.7
).
• Pump head not tight against casting
Carefully tighten the pump head mounting nuts just until the leak stops. DO
NOT OVERTIGHTEN!
• Leaking pressure transducer
Make sure the liquid line connections into the pressure transducer are tight.
Refer to Installation of Dionex Liquid Line Fittings (Document No. 031432)
for tightening requirements. Replace any damaged fittings.
• Leaking pump head waste valve
Make sure the waste valve is closed. To close the valve, turn the knob
clockwise, just until tight. DO NOT OVERTIGHTEN! Overtightening
may damage the valve and the pump head.
Inspect the pump head. If the waste valve is the source of the leak, replace the
waste valve O-ring (see Section 5.8
).