VACUUBRAND PC 620 - Manual (Page 23)

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.: 999029 / 01/10/2009
page 23 of 48
Basic setup Standard
Venting
Short venting (e. g. in case of boiling retardation or sudden
foaming occurs):
➨ Press key VENT shortly (< 2 sec.).
☞ Pumping is interrupted, the process control is stopped.
Venting the system:
➨ Press key VENT continuously (> 2 sec.).
☞ Pumping is interrupted, process control is stopped.
☞ Ventilation until pressure does not change any more, i. e.
until atmospheric pressure is attained
☞ Key STOP interrupts venting at any time.
The process control is inactive, i. e. controller is ready for vacuum
control, but control operation has not been activated.
☞ The controller is in operation mode two-point control, the
actual pressure is displayed.
☞ Values for set point p and hysteresis as from last operation
are reactivated.
☞ Press key START/STOP to start process control.
☞ If using a coolant valve, the valve must be configurated,
see section ”How to change the basic setup”.
After switching on
Starting and stopping the process control
In both modes (two-point control and continuous vacuum):
➨ To start the process control: Press key START/STOP.
☞ If the coolant valve is preselected: Coolant valve opens im-
mediately, the symbol is displayed.
☞ In-line valve opens. If a coolant valve is preselected, the in-
line valve opens at the first demand of vacuum 2 sec. after
the coolant valve: Pumped vapour reaches cold surfaces of
condenser.
➨ To stop the process control: Press key START/STOP.
☞ Attention: Take suitable precautions if the system risks to
become pressurized due to low boiling point solvents when
the in-line valve has been closed.
☞ If a coolant valve is preselected: Cooling water continues to
run for additional 5 min. to allow condensation, symbol cool-
ing water is flashing.
Switching between two point control and continuous pumping
➨ Press key MODE.
☞ Change of mode is only possible if the process control is
inactive (after switching on or pressing key START/STOP).
☞ The two-point control display disappears or appears.
MODE
Attention: If pressurized inert gas is used install an overpressure relief valve.
Max. pressure at the pressure transducer 1600 mbar! Ensure that high pressure
is compatible with the mechanical stability of the system!
START
STOP
VENT