VACUUBRAND VNC 1 - Manual (Page 20)

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.: 999118 / 16/12/2009
page 20 of 35
Temporary switching from ”vacuum control” to ”continuous pumping”:
➨ Keep key ▼ pressed for more than 2s (decrease of preset pressure) then press key ”Enter” additionally,
the controller switches to ”continuous pumping”. No change of the basic mode of the controller takes
place. Once the pump down is stopped (”Esc”), the controller VNC 1 switches back to the mode ”vacuum
control”.
☞ Tip for distillation: Temporary switching to continuous pumping enables an user friendly semiauto-
matic control of a distillation. Pumping down until the boiling point is reached, then press ”Enter” and
key
▼. The controller keeps the reached pressure value constant.
Temporary switching from ”continuous pumping” to ”vacuum control”
➨ If the key ”Enter” is pressed while pumping down, the pumping down is interrupted. Pressing additionally
the key ▼ results in switching to the mode ”vacuum control”. The actual pressure is stored as preset
pressure. No change of the basic mode takes place. Once the regulation is stopped, the controller
switches back to the mode ”Continuous pumping”.
☞ Tip for distillation: Temporary switching to continuous pumping enables an user friendly semiauto-
matic control of a distillation. Pumping down until the boiling point is reached, then press ”Enter” and
key
▼. The controller keeps the reached pressure value constant.
☞ Tip for filtration: Adjust preset pressure to a value well above the boiling pressure of the solvent (e.g.
water: p Set» 100 mbar). Set Limit to e.g. 500 mbar. Once the filtration has finished, the pressure
increases and the pump is switched off.