YL9111 Binary Pump
5-10. Troubleshooting
In case general problem occurs as the following table, confirm the possible causes regarding this first,
and then take proper countermeasures. The following table is countermeasure in case general problems
occur.
Problem Cause How to fix
Pressure upper
limit is loaded.
-Tubing inside is blocked.
-Check valve is blocked.
-Solvent is changed.
-Replace blocked tubing by
loosening to be from tail side
in turn.
-Replace outlet check valve.
-Wait until solvent is completely changed.
Pressure
increases or decreases. -Column is unstable.
-Change of solvent is incomplete. -Wait until change is completely performed.
-Wait until pressure is stable.
Solvent is not
flowed out
-Air bubble is in pump head.
-Air separation status of solvent
is bad.
-Check valve is not good.
-Liquid containing oil flows into head
part.
-High pressure seal was worn.
-Perform prime/purge again.
-Take measures so that air separation
condition of solvent may be good,
and perform prime/purge again.
-Wash or replace check valve.
-Remove oil in head sufficiently with strong
organic solvent using prime/purge port.
-Replace the high pressure seal.
Pressure is
unstable.
-Check valve is bad or defected.
-Air separation or mixing conditions
of solvent is bad.
-Compression compensating
reference value of configuration
mode is wrong.
-Cam shaft is loosened.
-High pressure seal was worn.
-Pump head was loosened.
-Wash or replace check valve.
-Use mobile phase with well mixed
solvent, and improve air separation
condition.
-Initialize compensation value or re-input
proper value.
-Tighten wrench bolt of cam shaft
-Replace high pressure seal.
-Tighten nut of pump head.
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