Thermo Scientific thermoscientific Vanquish Pumps C, Operating Manual

Page: 209 / 296

8 • Troubleshooting
Pumps C, Pumps F ( VC-Pxx, VF-Pxx)
Operating Manual Page 209
8.4 Resolving Liquid Leaks
TIP If leakage is observed around the purge valve knob (when the purge
valve is open) or on the purge outlet (when the purge valve is closed),
the purge valve knob may be defective (see
Replacing the Purge Valve
Knob ( } page 177) ).
When
The leak sensor is wet. The leak sensor reports leakage.
If leakage is not resolved after 3 minutes, the pump stops the flow.
Parts and additional items required
• Replacement part as required
• Cloth or tissue
Preparations
When resolving leakage, observe the safety guidelines and general rules
for maintenance and service as presented in
Maintenance and Service
(
}
page 117) .
Follow these steps
1. Locate the source of the leak.
As leakage usually occurs at a connection, visually inspect all
components and connections in the flow path.
The following tests can help you to identify the source:
¨
Leakage test for the seal wash system
See
Testing the Seal Wash System for Leakage ( } page 130) .
¨
Leakage test for the piston seals
See
Testing the Piston Seals for Leakage ( } page 159) .
¨
Leakage test for the entire pump
See
Testing the Pump for Leakage (General Test) ( } page 179) .
After taking remedial action as required, proceed with the next
steps.
2. With a cloth or tissue, thoroughly absorb all liquid that has collected
in the leak tray and under the leak sensor. Be careful not to bend the
sensor.
3. Allow the sensor to adjust to the ambient temperature for a few
minutes.
4. If leakage is no longer reported, you can resume operation.