ICS-900 Operator’s Manual
74 Doc. 065215-02 9/09
5.3 Isolating a Restriction in the Liquid Plumbing
A restriction in the liquid plumbing will cause excessive system backpressure.
1. Begin pumping eluent through the system (including the columns).
2. Follow the ICS-900 flow schematic (see Figure 2-4
) and work backward
through the system, beginning at the cell exit. One at a time, loosen each
fitting and observe the pressure. The connection at which the pressure drops
abnormally indicates the point of restriction.
If the restriction has caused such high pressure that the system cannot be
operated, you must work forward through the flow schematic, adding parts
one at a time until an abnormal pressure increase (and hence, the restriction) is
found.
3. If the restriction is in the tubing or fitting, remove the restriction by back
flushing or by replacing the tubing or fitting.
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