Thermo Scientific Dionex UltiMate 3000 Series, Operating Instructions Manual, Page: 81 / 270

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Operating Instructions Page 73
4.5.3.1 Purging the NC Pump
The purge procedure for the NC pump consists of two steps:
1. Purging the pump heads (separately or together)
2. Purging the flow meter
To make sure that the pump is free of air bubbles, both steps must be performed in the
correct order.
Fig. 33: Purge valves of the NC pump (here: Classic flow meter)
Tip:
When the fluid components of the pump are filled with liquid and the solvent
reservoirs are located above the pump outlet during pump operation, the
hydrostatic pressure in the system may cause eluent to escape when you open a
fluid connection in the pump.
Before you open a fluid connection, position the reservoirs below the
connection to be opened. Empty the solvents lines. If solvent shut off valves
are installed on the solvent lines, you can close the shut off valves instead.
4.5.3.1.1 Purging the Pump Heads
1. Attach a syringe to the free end of the silicone tubing on the purge nozzle of the pump
head (left head, right head, or both) that you want to purge. Two syringes are provided
in the accessories kit of the module.
2. Open the purge valve for the pump head that you want to purge. Turn the purge screw
counterclockwise with your hand to the stop.
Tip: Proper pump head purging is possible only if the purge valve is opened to
the stop
. Turn the purge screw about 3 to 4 turns counterclockwise. Even if
the screw can easily be turned earlier, the purge outlet will not be open
completely.
Purge screw
left head (channel A)
Flow meter outlet
Purge screw
right head (channel B)
Purge outlet
right head (channel B)
Purge outlet
left head (channel A)