Heidolph ROTAVAC Vario pumping unit - Manual (Page 35)

page 35 of 61
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.: 999248 / 28/04/2011
☞ Select function ” Pump down”. ”Speed”: ”HI” is recommended. For gel dryers set a lower speed if
necessary if the gels tend to break.
☞ Set ”Minimum” to prevent volatile components to evaporate. The process is stopped automatically as
soon as ”Minimum” is reached.
☞ Set a process time (”Duration”) if necessary.
☞ Start process by pressing key ”START/STOP”.
alternatively:
☞ Select function ”Vac control” to dry at a predetermined vacuum level.
☞ Set ”Set vacuum” to the evaporation vacuum of the solvent.
☞ Set a process time (”Duration”) if necessary.
☞ Start process by pressing key ”START/STOP”.
5.7 Examples for use
Assembly of a vacuum system
☞ Assemble vacuum connection lines between controller, vacuum pump and apparatus.
☞ Assemble electrical connections.
☞ Connect coolant if necessary.
5.7.1 Vacuum for filtration and suction
☞ Select function ” Pump down”.
☞ If necessary set value for ”Speed” (high or low pumping speed). Reduce the speed in case of fast
sedimentation (formation of a filter cake).
☞ Set ”Minimum” to a value which still does not lead to evaporation of the solvent.
☞ Start process by pressing key ”START/STOP”.
alternatively:
☞ Select function ” Vac control”.
☞ If necessary set value for ”Speed” (high or low pumping speed). Reduce the speed in case of fast
sedimentation (formation of a filter cake).
☞ Set ”Maximum” to switch off the pump at the end of the process or in case of a filter cake crack (pres-
sure increase).
☞ Start process by pressing key ”START/STOP”.
☞
Tip for filtration: Adjust preset pressure to a value well above the boiling pressure of the solvent
(e.g. water >>20 mbar). Set the maximum pressure to e.g. 500 mbar. Once the filtration has finished,
the pressure increases and the pump is switched off automatically.
5.7.2 Vacuum for gel dryer, drying chambers and vacuum concentrators