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

7 • Maintenance and Service

7.11 Testing the Pump for Leakage

When
Parts and additional items required
Follow these steps
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After maintenance on the fluidic system of the pump, for example on
the flow connections, pump head, or check valves
•
Fitting plug, Viper
•
Solvent suitable for your application
1. Disconnect the capillary on the outlet of the inline filter (or static
mixer if installed).
2. Close the outlet with the fitting plug.
3. Set the upper pressure limit to 145 MPa.
4. Apply a flow of 50 µL/min and use the solvent for the application.
5. Observe the pressure. When the pressure reading is between
60 MPa and 100 MPa, change the flow rate to a lower value.
6. Have the pump deliver until a pressure of 140 MPa has built up.
7. When the pressure is 140 MPa, apply a flow of 1 µL/min.
8. Observe the pressure.
The pressure should increase or remain constant for a minimum of
1 minute. A drop in pressure indicates possible leakage.
9. Find and eliminate the cause for the leak:
a) Check the sources listed further down in this section.
b) Before taking remedial action, you must purge the pump to
depressurize the system. Purge the pump for a minimum of
10 seconds.
Possible sources for leakage:
♦
Capillary connections
Inspect the capillary connections for signs of leakage. Tighten or
replace leaky connections.
Vanquish Pumps (VH-P10) Operating Manual