Manual

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.: 999073 / 15/12/2009
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 constant.
☞ Operating in the equilibrium of the process by continuous
adaptation of the controller, no abrupt operation 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, sucking liquids by siphon, drying, sucking
off excesses, etc.
☞ Suction with adjustable 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 or pressure
dependant variable pumping 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 basic setup
vacuum control).
☞ Automatic switching off after complete evaporation of the
solvent, if preselected.
In all basic setups:
☞ 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 components of the VACUUBRAND chemistry vacuum system which are con-
nected to the system.
- the specific user and/or process requirements.
The vacuum controller CVC 2000
II
offers three basic setups depending on
The controller CVC 2000
II
can be adapted to the specific application by choosing the