Vacuum for vacuu•lan networks – VACUUBRAND PC 620 NT User Manual
Page 33
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.: 999188 / 19/05/2009
Semi-automatic distillation and evaporation
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Select function ”
Pump down”.
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Start process by pressing key ”START/STOP”.
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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.
alternatively:
Diaphragm pump with isolation valve and/or Vacuum-Management-System
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Select function ”
Vac control”.
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Set ”Set vacuum” (and ”Hysteresis” ,if necessary) depending on the solvent and the temperature.
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Set the ”Set vacuum” to a value which ensures that the solvent boils definitely with respect to hyster-
esis and the set bath temperature.
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To set ”Maximum” is usually not necessary 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 at the end of a definite time automati-
cally.
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Use ”Delay” to pump condensate out of the pump at the end of the process. During ”Delay” the cool-
ant is still running. The isolation valve is closed and so the pump is separated from the apparatus.
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Start process by pressing key ”START/STOP”.
Vacuum for distillation and evaporation (e. g. rotary evaporator)
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Select function
VACUULAN.
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Set ”Set vacuum” to a pressure value which can be reached in the vacuum network reliably under
consideration of the ultimate vacuum of the pump and the leak rate of the system in case of no
vacuum demand.
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Choose the vacuum for switching on the pump again (”Switch on”) in order to ensure sufficient
vacuum for all processes.
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Preset ”Delay” if necessary.
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Start process by pressing key ”START/STOP”.
Vacuum for VACUU•LAN networks