BUCHI Vacuum Pump V-710 - Manual (Page 19)

4 Description of function
19 V-700/710 Operation Manual, Version E
4 .1 .4 Gas ballast
The gas ballast serves to aerate the system (membrane and valves) during pump operation, thus
avoiding the collection of condensed solvent within the system.
NOTE
The end vacuum is reduced to about 24 mbar when the gas ballast is open. The air stream due to
the open gas ballast dries wet membranes, therefore close the gas ballast when the membranes are
dry to reach a low end vacuum.
Fig. 4.4: Gas ballast shown open on the picture on the left and closed on the picture on the right
4 .2 Vacuum Controller V-850/855
4 .2 .1 Control keys of Vacuum Controller V-850
1
2
3
4
5
2 2 2
a Selection knob
b Functional buttons
c Display d START button
e STOP button
Fig. 4.5: Overview of the vacuum controller