VACUUBRAND PC 3012 NT VARIO Duo - Manual (Page 75)

page 69 of 145
Assembly of a vacuum system
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Assemble vacuum connection lines between vacuum pump, CVC
3000 and vacuum application.
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Assemble the vacuum connection line between the controller and the
vacuum application, if the controller is not part of a pumping unit.
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Assemble electrical connections.
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Connect coolant if necessary.
Vacuum for filtration and suction
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Select ” Pump down” function.
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If necessary, set value for ”Speed” (high or low pumping speed). Re-
duce the speed in case of fast sedimentation (formation of a filter cake).
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Set ”Minimum” to a value which provides adequate suction but does
not lead to evaporation of the solvent.
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Start process by pressing ”START/STOP” key.
alternatively:
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Select ” Vac control” function.
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Set ”Set vacuum” to a value which does not lead to evaporation of the
solvent.
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If necessary, set value for ”Speed” (high or low pumping speed). Re-
duce the speed in case of fast sedimentation (formation of a filter cake).
☞
Set ”Maximum” pressure setting so that pump will switch off at the end
of the filtration process, or in the event that a filter cake cracks, leading
to a sudden pressure increase.
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Start process by pressing ”START/STOP” key.
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Tip for filtration: Adjust preset pressure to a value well above the
boiling pressure of the solvent (e.g., for water >>15 Torr (20 mbar)).
Set the maximum pressure to e.g., 375 Torr (500 mbar). Once the fil-
tration has finished, the pressure increases and the pump is switched
off automatically.
Application examples