Thermo Scientific thermoscientific Vanquish Pumps C, Operating Manual

Page: 152 / 296

7 • Maintenance and Service
Page 152 Pumps C, Pumps F ( VC-Pxx, VF-Pxx)
Operating Manual
Allowing New Piston Seals to Run In
1. On the purge/sensor unit, attach silicone tubing to the purge outlet
(if it is not yet connected).
2. Route the free end of the tubing to the drain port outlet (see
Guiding Liquids to Waste ( } page 64) ).
3. Open the purge valve by turning the valve knob counterclockwise.
4. Install the backpressure capillary on the pump outlet.
5. With the Viper union, connect the nanoViper capillary to the
backpressure capillary. Guide the free end of the capillary to the
waste container.
6. Operate the pump. For 15 minutes, apply a flow of 1.3 mL/min using
isopropanol.
7. Close the purge valve by turning the valve knob clockwise.
8. Generate the necessary backpressure. For 30 minutes, apply the
flow indicated in the table using isopropanol.
Pump Type Flow Backpressure
VC-pumps 1 mL/min (approximately) 45 MPa (approximately)
VF-pumps 2 mL/min (approximately) 80 MPa (approximately)
9. Turn off the pump flow and wait until the system pressure is down
to zero.
10. Remove the capillary from the pump outlet and reconnect the pump
to the system.
11. Purge the pump using the solvent for your application.
12. When purging is complete, empty the silicon tubing.
13. If an increased leakage rate is observed with new piston seals after
several hours of operation, operate the pump for at least 2 hours at
35 MPa.
TIP If the piston seals are not sufficiently tight yet, have the pump build
up high pressure and hold the pressure for some minutes.