Thermo Scientific Dionex ICS-5000, Operator'S Manual

Page: 338 / 482

Dionex ICS-5000 Operator’s Manual
322
Doc. 065342-06 12/11
e. The seal wash seal is now partially installed. To complete the seal
installation, place the retainer in the seal wash body and use the large
flat-blade screwdriver to tighten the retainer.
f. Place the new O-ring (P/N 040695) on the seal wash body.
NOTE
When replacing a piston seal, always replace the O-
ring, also. This will prevent leaks.
g. If this is a capillary IC pump, place the new backup ring
(P/N 074371) on the seal wash body.
2. Rinse the new main piston seal (P/N 075493, for capillary pump;
P/N 064946, for analytical pump) with isopropyl alcohol (IPA) or dip it
into a container of IPA. (The seal is easier to install when it is moist.)
3. Insert the piston through the seal wash assembly, and then through the
new main piston seal.
4. Make sure the piston seal is centered.
5. Place the front of the pump head, flat side down, on a clean work surface.
Make sure the open side of the piston seal faces away from the retainer for
the seal wash seal.
6. Using IPA, rinse inside the pump head cavity where the seal will be
installed. Blow inside the cavity to dry it using the 0.2 micron filtered,
canned air duster. Inspect the cavity for any particulate matter. If
necessary, rinse and dry again, until the cavity is clean. Fill the cavity
with ASTM Type I (18 megohm-cm) filtered and deionized water.
7. Place the components on the pump head and gently press the housing until
the piston seal snaps into place.
When pressing the seal in place, ensure that the piston is free to move out,
to relieve the pressure in the pump head during seal installation.
8. Remove the 10-32 fitting plugs from the pump head.
If the piston seal is not centered, applying pressure to it in Step 7 will
damage the seal and make it unusable.
Do not use a sharp tool (such as tweezers) to install the piston seal.
This will scratch the seal and the inside of the pump housing; these
scratches will prevent a proper seal and cause leakage.