VACUUBRAND PC 3012 NT VARIO Duo - Manual (Page 77)

page 71 of 145
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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.
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If neither ”Minimum” nor ”Duration” is preset, pumping down has to be
finished by pressing the ”START/STOP” key.
alternatively:
Semi-automatic distillation and evaporation
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Select function ” Pump down”.
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Start process by pressing ”START/STOP” key.
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Observe process. As soon as evaporation starts, press ”MODE” key
(switching to ”Vac control”). The vacuum level is kept constant (at the
boiling pressure). Fine tuning of the vacuum value is possible by turn-
ing the selection knob.
Pressing ”MODE” key a second time switches to ”Auto mode” causing
the vacuum level to be automatically adapted to changes of the boiling
pressure.
alternatively:
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Select ” Vac control” function.
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Set a maximum ”Speed”, to select a faster or slower process.
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To set ”Maximum” is usually not necessary, unlike filtrations, because
the pressure does not increase at the end of the evaporation.
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Set a value for ”Duration” if the process should be terminated auto-
matically after a definite time.
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Set ”Set vacuum” depending on the solvent and the temperature.
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Start process by pressing ”START” key.
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To temporarily switch to ”Auto mode”: Press ”MODE” key. The
controller switches to ”Auto mode”. The setting of the controller does
not change due to this switching. After pressing ”START/STOP” key
the controller is in ”Vac control” again.