BUCHI Vacuum Controller V-855 - Manual (Page 44)

6 Operation
44 V-850/855 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.