Testing The Piston Seals For Leakage - Thermo Scientific Vanquish VH-P10 Operating Manual

7.6.9

Testing the Piston Seals for Leakage

When
Parts required
Follow these steps
Vanquish Pumps (VH-P10) Operating Manual
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)".
Backpressure capillary (from Diagnostics tool kit) (optional)
1. From Chromeleon, start a seal wash cycle.
2. Disconnect the tubing from the seal wash detector (port labeled in).
Figure 64: 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 80 MPa of
backpressure is produced.
For example, install an appropriate backpressure capillary on the
pump outlet (outlet of the inline filter or static mixer).
5. Apply an appropriate flow rate.
6. To evaluate possible leakage, observe the liquid level in the tubing.
Finish the observation before a new seal wash cycle starts (after one
hour).
7 • Maintenance and Service
No. Description
1 Seal wash detector
2 Tubing connection port (port labeled
in)
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