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16
Maintenance by the user
Piston backflushing
SOP 5
Removing the pump head
SOP 6
Only the pump heads are subject for maintenance. Both pump
heads (10ml and 50ml) differ only in some sizes. Therefore the
descriptions are valid for both of them. If you should use some
older pump head versions (stainless steel or PEEK), please
contact our service division to get the corresponding instructions.
Piston
backflushing
decontaminates from the backside of the pistons.
If you use saline solvents or buffer solution we highly recommend
that you continuously backflush in order to prevent crystallization
which can damage your piston seals.
Piston backflushing
1.
Push a 1/16 ID tube onto both flushing opening, see Piston
backflushing capillaries, item 3.2 in Fig. 2 on page 7.
2.
Place the low end of the tubing in a flask.
3.
Fill the syringe with rinsing liquid.
4.
Connect the syringe with the tubing.
5.
Press liquid through the pump head, until it flows without any
air bubbles into the container.
6.
Remove tubings from flush opening.
We recommend connecting both flush openings with a tubing
to prevent vaporization of solvents and drying out of the
piston chamber.
If you want operation with continuous backflushing you can attach
two containers of rinsing liquid instead of the priming syringe. The
containers should be positioned that one container is located
higher than the other, thus ensuring liquid flow through the pump
head without any assistance.
For exchange of the pump head, or for disassembling it in order to
clean valves or replace piston seals, piston rods etc.
Removing the pump head
1.
Purge the pump head with a suitable cleaning agent and
then with distilled water.
If organic solvents remain in the pump head, danger of skin
irritation may exist.
2.
Loosen the eluent outlet, item 3.7 in Fig. 2 on page 7 and
the fittings at valve housing inlet, item 3.6
Maintenance by the user
removes
traces
of
salt
and
other
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