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Troubleshooting and Test Functions
Evaluating the Results
No Pressure increase at Ramp 1
Pressure limit not reached but plateaus horizontal or
positive
Potential Cause Corrective Action
Pump not running. Check the logbook for error messages.
Purge valve open. Close the purge valve, and restart the test.
Loose or leaky fittings. Ensure all fittings are tight, or exchange
capillary.
Wrong solvent-line connections. Ensure the solvent lines from the degasser
are connected correctly (channel D for
quaternary pump).
Contaminated purge valve. Open and close purge valve to flush out
contamination. Exchange the valve if still
leaky.
Large leaks (visible) at the pump seals. Exchange the pump seals.
Large leaks (visible) at active inlet valve,
outlet valve, or purge valve.
Ensure the leaky components are installed
tightly. Exchange the component if required.
Potential Cause Corrective Action
Degasser and pump not flushed sufficiently
(air in the pump head).
Purge the degasser and pump thoroughly
with isopropanol under pressure (use the
restriction capillary).
Wrong solvent. Install isopropanol. Purge the degasser and
pump thoroughly.