Thermo Scientific Dionex ICS-2000, Operator'S Manual

Page: 132 / 390

ICS-2000 Ion Chromatography System
5-22
Doc. 031857-03 4/06
Reinstalling the Head and Piston
Dionex recommends reinstalling the head and piston as a single assembly, so that
the piston centers itself onto the magnetic follower.
1. Hold the assembled spacer and guide with the drain tubes aligned vertically
and press the spacer into the head until it is flush with the indented surface of
the head.
2. Insert the piston so that 1/4 inch of the shaft is exposed. This ensures that the
magnet in the follower picks up the piston. (The follower is the cylinder that
holds the piston in place as it moves in and out of the pump head assembly.)
3. Reinstall the head and piston assembly; use a wrench to tighten the nuts
evenly (12 in-lb torque).
Completing the Procedure
1. Reconnect all liquid lines to the pump head.
2. Turn on the main power switch.
3. Open the eluent valve.
4. Prime the pump (see Section B.13 ).
5.7 Replacing a Pump Piston
Continued leaking of the piston seal after installation of a new seal (assuming
the pump head is tight) indicates a dirty, scratched, or broken piston.
Follow the instructions in Section 5.6 to install a new piston (P/N 052840) and
piston seal (P/N 055870).