Thermo Scientific Vanquish VH-P10-A-02, Operating Manual

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7 • Maintenance and Service
Vanquish Pumps (VH-P10-A-02) Operating Manual Page 161
7.7.9 Testing the Piston Seals for Leakage
When
Pressure pulsation, shift in retention times and/or poor reproducibility
can indicate possible piston seal leakage.
If messages regarding piston seal leakage appear in the chromatography
software, for example, "The piston seal leakage has exceeded the
recommended limit (code 4121)".
Chromeleon 7.2.6 and later
Run the Advanced Leak Test (see section 8.3, page 207 ).
Chromeleon 6.8 and Chromeleon 7 earlier than Chromeleon 7.2.6
Parts and additional items required
• Backpressure capillary (from Diagnostics tool kit) (optional)
• Isopropanol
Follow these steps
1. From Chromeleon, start a seal wash cycle.
2. Disconnect the tubing from the seal wash detector (port labeled
in
).
Figure 66: Seal wash detector
3. Remove some liquid from the tubing, for example, by shaking the
tubing.
4. Set up the system in such a way that approximately 120 MPa of
backpressure is produced.
For example, install an appropriate backpressure capillary on the
pump outlet (outlet of the inline filter or static mixer).
No. Description
1 Seal wash detector
2 Tubing connection port (port labeled
in )