Thermo Scientific ProPac SCX-20 Product Manual page 20

Product Manual for ProPac
B.4 Replacing Column Bed Support Assemblies
Replace the inlet bed support ONLY if the column is determined to be the cause of high system
backpressure, AND cleaning of the column does not solve the problem.
NOTE
1. Carefully unscrew the inlet (top) column fitting. Use two open end wrenches.
2. Remove the bed support. Tap the end fitting against a hard, flat surface to remove the bed support and seal
assembly. Do not scratch the wall or threads of the end fitting. Discard the old bed support assembly.
3. Removal of the bed support may permit a small amount of resin to extrude from the column. Carefully remove this
with a flat surface such as a razor blade. Make sure the end of the column is clean and free of any particulate matter.
Any resin on the end of the column tube will prevent a proper seal. Insert a new bed support assembly into the end
fitting and carefully thread the end fitting and bed support assembly onto the supported column.
4. Tighten the end fitting finger-tight, then an additional ¼ turn (25 in x lb.). Tighten further only if leaks are observed.
If the end of the column tube is not clean when inserted into the end fitting, particulate matter may
prevent a proper seal between the end of the column tube and the bed support assembly. If this is the
case, additional tightening may not seal the column but instead damage the column tube or break the
WARNING
end fitting.
Document No. 065403-01
®
SCX-20
©2010 DIONEX CORPORATION
Page 19 of 21
September 2010