VACUUBRAND PC 3012 NT VARIO Duo - Manual (Page 76)

page 70 of 145
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Select function ” Pump down” function. ”Speed” ”HI” is recommended.
For gel dryers set a lower speed if necessary (if the gels tend to crack).
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Set ”Minimum” to prevent volatile components from evaporating. The
process is stopped automatically as soon as ”Minimum” is reached.
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Set a process time (”Duration”) if necessary.
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Start process by pressing ”START/STOP” key.
alternatively:
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Select ”Vac control” function to dry at a predetermined vacuum level.
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Set ”Set vacuum” to the preferred evaporation vacuum of the solvent.
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Set a process time (”Duration”) if necessary.
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Start process by pressing ”START/STOP” key.
Vacuum for gel dryer, drying chambers and
vacuum concentrators
Fully automatic determination and adaptation of the boiling point
(recommended)
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Select ” Auto mode”.
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Start process by pressing ”START/STOP” key.
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The ”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).
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If ”Minimum” is set, the controller switches off the pump when the pre-
set vacuum value is reached. The ”Minimum” should be well below
the boiling vacuum of the solvent to be evaporated and above the ul-
timate vacuum attainable in the apparatus. If the ”Minimum” is set to
”Auto” , the controller 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.
Vacuum for distillation and evaporation
(e.g., rotary evaporator)