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

Page: 179 / 238

7 • Maintenance and Service
Vanquish Pumps (VH-P10-A-02) Operating Manual Page 179
Possible sources for leakage:
♦
Capillary connections
Inspect the capillary connections for signs of leakage. Tighten or
replace leaky connections.
♦
Piston seals
♦
Test the piston seals for leakage. Replace leaky piston seals.
♦
If leakage is observed with new piston seals, run in the seals.
Using the solvent of your application or water, operate the
pump for 2 hours or longer at 35 MPa.
♦
Check valves
♦
If leakage is observed on the connection port, turn off the
pump flow. When the system pressure is down to zero,
tighten the check valve a little more.
♦ Remove the check valve. Clean the check valve in an
ultrasonic bath. If cleaning is not sufficient, replace the
check valve.
♦
Purge Unit
Pull the waste line out of the waste outlet port (see
Figure 13,
page 64 ) and repeat the test. If liquid leaves the waste line, the
purge unit is leaky. Contact Technical Support.
After the test, push the waste line back into the waste outlet
port. To avoid false leak alarms, verify that the waste line sits
properly in the waste outlet port. If it does not, liquid from the
purge unit may accumulate in the drain port and activate the
leak sensor.