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

Page: 178 / 238

7 • Maintenance and Service
Page 178 Vanquish Pumps (VH-P10-A-02) Operating Manual
7.12 Testing the Pump for Leakage
When
After maintenance on the fluidic system of the pump, for example on
the flow connections, pump head, or check valves
TIP If you are using Chromeleon 7.2.6 and later, run the Advanced Leak
Test (see section 8.3, page 207 ).
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
•
Fitting plug, Viper
• Solvent suitable for your application
Follow these steps
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.