
Causes of and Countermeasures for Clogging in
Flow Lines
Corrective Action
Cause of Clogged Tubing
Especially when a buffer solution is used as the mobile phase, filter the
buffer solution before use with a commercially available strainer that has
a membrane filter with a bore diameter of 0.45 µm maximum. Insoluble
matter contained in salt can clog the tubing.
Filtering is also important for protecting the column.
Required Materials:
• Filtering apparatus with a filter holder
• Membrane filter (with a bore diameter of 0.45 µm max.)
Insoluble matter in the mobile phase.
If the sample solution is turbid or contains insoluble matter, then use a
commercially available disposable filter to filter the sample solution before
analysis. Insoluble matter contained in the sample can cause clogging in
the tubing or the column, just as with insoluble matter in the mobile phase.
Required Materials:
Disposable filter
Insoluble matter in the sample.
Avoid a dirty or dusty environment when working with the system panels
open. Small dirt or dust in the environment can enter from the injection
port and cause clogging. Normally, this is not an issue because analysis is
performed with the front panel of the system closed.
Suspended particulates or dirt in the
environment.
The injection port has a needle seal installed. If a needle become misaligned
even a little, then the needle might cut the needle seal. If this generates
needle seal shavings, then these shavings might clog the tubing. If the
tubing is clogged, then confirm misalignment of the needle on the injection
port by selecting
Auxiliary Operation > Injection Port Operation
Check
and moving the needle up and down. If misalignment of the needle
is observed, then adjustment of the injection port is necessary.
Shavings of the needle seal installed
in the injection port.
Hardware User Guide
ExionLC
™
100 System
RUO-IDV-05-1839-C
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Troubleshooting