VACUUBRAND MZ 2C VARIO - Manual (Page 20)

page 20 of 51
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.: 999034 / 22/04/2008
The controller CVC 2000 II can be adapted to the specific application by choosing the
appropriate mode, vacuum control with or without automatic, continuous pump-
ing with preset pumping speed or VACUU•LAN: The components of the chemistry
vacuum system (coolant valve, venting valve) have to be preset once only. The mode
as from last operation and the preselected values (e. g. for pressure, speed or time for
switching off) are stored. In case of similar operation conditions it is possible to start
immediately, if the preselections are chosen appropriately.
Working with the controller
How to configurate the controller
Vacuum control:
☞ Position control on preset pressure value.
☞ The pumping speed is adapted to the occurring gas/vapour,
so that the preset pressure value is kept constantly.
☞ Operating in equilibrium by continuous adaption of the con-
troller, no abrupt switching of valves.
☞ Vacuum supply according to the requirements for lock cham-
bers or pumping systems not compressing against atmos-
pheric pressure, e. g. wide range turbomolecular pumps or
cryo pumps.
Continuous pumping with preset pumping speed:
☞ Simple suction, suck liquids by siphon, drying, sucking off
excess, etc.
☞ Suction with regulated pumping speed.
☞ Pumping down until the ultimate vacuum of the pump is
achieved (e. g. to dry a system).
☞ System controlled by an interface: temporally variable pump-
ing speed to optimise the process conditions (e. g. to dry
sensitive substances).
☞ Pumping with pressure selection ”HI”: Optimum pumping
speed at any pressure.
Vacuum control in automatic mode:
☞ Searching the boiling point and adjusting the set point auto-
matically if the boiling point changes (due to temperature
change, change of ingredients of solutions).
☞ Adjusting the set point automatically after manual setting of
the boiling point (additional automatic mode in operation mode
vacuum control).
☞ Automatic switching off after complete evaporation of the
solvent if preselected.
In all modes:
☞ If cooling water and/or venting valve have been connected
and preselected:
☞ Process-adapted operation of the coolant valve.
☞ Key-driven venting or adjustment of the set point by venting
if process control is active.
The vacuum controller CVC 2000 II offers three modes depending on
- the components of the VACUUBRAND chemistry vacuum system which are con-
nected to the system.
- the specific user and/or process requirements.