Thermo Scientific Dionex ICS-5000, Operator'S Manual

Page: 341 / 482

9 • DP/SP Service
Doc. 065342-06 12/11
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6. To prevent contamination of pump parts, wear cleanroom gloves while
disassembling the pump head.
7. Disconnect all tubing connections to the pump head with the damaged
piston.
8. Using a 3.0 mm hex key (P/N 062338), loosen the Allen screws on the
pump head with the damaged piston. Remove the Allen screws, and then
carefully remove the head and place it on a clean surface.
9. If the piston was not removed with the pump head in Step 8 , remove the
piston now by pulling it straight out of the pump mechanism.
NOTE
A magnet secures the piston in place. If the magnetic
force makes the piston difficult to remove, tilt the pis-
ton to one side and then pull it out of the pump mecha-
nism.
10. If the piston is broken, be sure to remove all broken pieces. If necessary,
flush the pump head with ASTM Type I (18 megohm-cm) filtered and
deionized water.
9.8.2 Reinstalling the New Piston
Slide the new piston (P/N 068646, for capillary; P/N 062082, for analytical)
partway into the pump head; approximately 6 mm (1/4 in) of the sapphire part
of the piston should extend from the head.
9.8.3 Reinstalling the Pump Head
1. Place the pump head back on the pump.
2. Reinstall the screws in the pump head. Using the 3.0 mm hex key
(P/N 062338), tighten the screws just until they come into contact with
the pump head. Then, tighten the screws another one-quarter to one-half
turn, one-eighth of a turn at a time.
Never disassemble the pump head with bare hands. Even minute
particles of dust, dirt, etc., on the check valves or piston can
contaminate the inside of the pump head and result in poor pump
performance.