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Vacuum for distillation and evaporation (e. g. rotary evaporator)
Semi-automatic distillation and evaporation
☞ Select function "Pump down".
☞ Start process by pressing key "START/STOP".
☞ Observe process. As soon as evaporation starts, press key "MODE" (switching to "Vac control"). The
vacuum level is kept constant (at the boiling pressure). Fine tuning of the vacuum value is possible
by turning the selection knob.
Pressing key "MODE" a second time switches to "Auto mode" causing the vacuum level to be auto-
matically adapted to changes of the boiling pressure.
alternatively:
☞ Select function "Vac control".
☞ Setting a maximum "Speed" leads to a faster or slower process.
☞ To set "Maximum" is usually not necessary because the pressure does not increase at the end of the
evaporation.
☞ Set a value for "Duration" if the process should be terminated automatically after a definite time.
☞ Set "Set vacuum" depending on the solvent and the temperature.
☞ Start process by pressing key "START".
☞ Temporary switching to "Auto mode": Press key "MODE". The controller switches to "Auto mode".
The setting of the controller does not change due to this switching. After pressing key "START/STOP"
the controller is in "Vac control" again.
alternatively:
Fully automatic determination and adaptation of the boiling point (recommended)
☞ Select function "Auto mode".
☞ Start process by pressing key "START/STOP".
☞ The function "Auto mode" allows a fully automatic distillation even if the boiling vacuum is unknown.
In case of solvent mixtures the vacuum is reduced until all solvents or volatile components are
evaporated (with respect to the ultimate vacuum of the pump and the bath temperature).
☞ If "Minimum" is set the controller switches off the pump when the preset vacuum value is reached.
The "Minimum" should be clearly below the boiling vacuum of the solvent to be evaporated and
above the ultimate vacuum attainable in the apparatus. If the "Minimum" is set to "Auto" , the control-
ler automatically switches off the pump at the end of the evaporation (recommended for large solvent
quantities only). The setting of "Duration" (process runtime) has no effect if the pump is switched off
due to "Minimum" before "Duration" is over.
☞ When setting a value for "Duration" the controller switches off the pump when "Duration" has passed
even if a preset "Minimum" is still not reached.
☞ If neither "Minimum" nor "Duration" is preset, pumping down has to be finished by pressing key
STOP.
Fore-vacuum for high vacuum pumps
Using the pump NT VARIO as fore-vacuum pump for a high vacuum pump (e.g. turbo-molecular with
high fore-vacuum tolerance):
☞ Function "Pump down" with "Speed" set to "HI" or
☞ Function "Vac control" with "Set vacuum" set to "Turbo"
Documents are only to be used and distributed completely and unchanged. It is strictly the users' responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999164 / 19/05/2009
page 39 of 75
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