VACUUBRAND CVC 3000 - Manual (Page 47)

page 47 of 80
Assembly of a vacuum system
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Assemble vacuum connection lines between CVC 3000 controller or
an external pressure transducer, vacuum pump (NT VARIO / VARIO-B
pump or diaphragm pump with in-line valve or Vacuum-Management-
System) and vacuum application.
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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; only
with NT VARIO / VARIO-B pump). Reduce 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” (and ”Hysteresis”, if necessary; only without NT
VARIO / VARIO-B pump) to a value which does not lead to evapora-
tion of the solvent.
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If necessary, set value for ”Speed” (high or low pumping speed; only
with NT VARIO / VARIO-B pump). Reduce the speed in case of fast
sedimentation (formation of a filter cake).
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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