Buchi V-850, Operation Manuals

Page: 44 / 54

6 Operation
44
V-850 / V-855 Operation Manual, Version E
6 .10 Tips and tricks for a distillation
6 .10 .1 What to do when the solvent starts foaming?
• Press the button P
↑
. The current system pressure is frozen and the aeration valve is opened. The
system is aerated and switches into the Hold mode, i.e. the H Off button becomes active.
• When the foam is gone or has sufficiently degenerated, press the H Off button to continue with the
distillation process.
• In case the solvent starts foaming again, repeat the measures described above.
6 .10 .2 How to find out the distillation conditions for a solvent?
The solvent library integrated into the vacuum controller software provides you with information on a
number of different solvents.
To use the library, proceed as follows:
• Press the Library button. The solvent library screen opens.
• Select the solvent you are operating with by means of the selection knob on the vacuum controller
and press OK .
• Now define the bath temperature you want to operate with by means of the selection knob on the
vacuum controller and press Accept . The setting is saved and the value for pressure is adapted
accordingly.
NOTE
The values indicated for boiling point and cooling H
2
O max only serve for information purposes.
6 .10 .3 How to start a distillation without determining a pressure setpoint?
Preconditions:
• In the submenu
Remote control Evaporator , the options Rotation start and Immerse flask
have to be set to
Off
.
For a distillation quick start, proceed as follows:
• On the main screen press the
Cont . button. The distillation starts.
• Now press the Man . button to enter the Manual mode.