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

Page: 162 / 238

7 • Maintenance and Service
Page 162 Vanquish Pumps (VH-P10-A-02) Operating Manual
5. Apply a flow rate of 3 mL using isopropanol.
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. Depends on your observation:
♦ Liquid level in the tubing remains unchanged
The piston seals seal tightly. Reconnect the seal wash tubing to
the seal wash detector (port labeled
in ). This completes the test.
♦ Liquid level in the tubing is decreasing
The seal wash seals are leaky. Continue with the next steps:
a) Replace the seal wash seals.
b) Reconnect the seal wash tubing to the seal wash detector
(port labeled
in ).
c) Repeat the test starting with step 1.
♦ Liquid level in the tubing is increasing
One or more piston seals are leaky. Continue with steps 8 to
end.
8. On the right pump head, remove the seal wash tubing that connects
the left pump head to the right pump head.
9. Apply a flow rate of 3 mL for 100% solvent A using isopropanol.
10. For about 5 minutes, observe the liquid level in the tubing. Finish the
observation before a new seal wash cycle starts.
11. Depends on your observation:
♦ Liquid level in the tubing increases again
a) Replace the piston seals in the
left
pump head.
b) Reconnect the seal wash tubing to the right pump head.
c) Reconnect the seal wash tubing to the seal wash detector
(port labeled
in ).
d) Repeat the test starting with step 1.
♦ Liquid level in the tubing does not increase again
a) Replace the piston seals in the
right
pump head.
b) Reconnect the seal wash tubing to the right pump head.
c) Reconnect the seal wash tubing to the seal wash detector
(port labeled
in
).
d) Repeat the test starting with step
1
.