Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 209

• Recommended
Run the General Leak Test from Chromeleon (→ page 134).
• In rare cases, new seals may still show an increased leakage rate after several hours of
operation.
If leakage is observed with new piston seals, operate the pump for at least 2 hours at
35 MPa to run in the seals. (It does not help if you tighten the pump head screw more.)
Tip: If the piston seals do not yet seal sufficiently tight, try the following: Have
the pump build up high pressure (→ page 211) and hold the pressure for
some minutes.
Operating Instructions
UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 201