Dionex AXP/AXP-MS Manual
1.1.3 Self-Flushing Pump Head
Self-flushing pump heads provide continuous washing of the piston
surface without the inconvenience of a manual flush or gravity feed
arrangement. The self-flushing pump head uses a diaphragm and
secondary set of check valves to create a continuous and positive flow
in the area behind the high pressure pump seal. The flushing solution
washes away any buffer salts that have precipitated onto the piston. If
not removed, these precipitates can abrade the high pressure seal and
cause premature seal failure, leakage, and damage to the pump.
Note: When the Dionex AXP is used as a sample loading pump for
trace ion applications, the convoluted diaphragm will cause sample
contamination. Remove the diaphragm as described in Section 5.2.1.
Once the diaphragm is removed, the seal wash feature must not be
used; if it is, wash solution will drain past the piston retainer. Rotate
the flush housing 180 degrees so that the self-flush outlet tubing is
facing down. This will allow any leaks from the high pressure seal to
drain from the head assembly.
Figure 1-1. Self-Flushing Pump Head
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