VACUUBRAND PC 620 - Manual (Page 24)

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 24 of 48
➨ Set hysteresis Δp by using keys Δp▲ or Δp▼:
☞ Set mode is activated by pressing key shortly: Set Δp ap-
pears.
☞ Short tips toggle in steps of 1 mbar.
☞ Continuous pressing activates ramp: Hysteresis Δp changes
with increasing speed.
Continuous pumping
Pumping down until the ultimate vacuum of the pump is
attained (e. g. pump down to dry off volatile liquids in the sys-
tem):
If the controller is in mode two-point control:
➨ Press key MODE to change to continuous pumping.
☞ Changing the mode is only possible if the process control is
inactive.
☞ The two-point control display disappears.
MODE
➨ Start: Press key START/STOP.
☞ Arrow down and valve and/or pump symbol are flashing.
➨ Stop: Press key START/STOP.
➨ Selecting the set point by using keys p▲ or p▼.
☞ Set mode is activated by pressing key shortly: Set p ap-
pears.
☞ Short tips toggle p in steps of 1 mbar.
☞ Continuous pressing activates ramp: set point p changes
with increasing speed.
☞ Changing set point p leads at the same time to an automatic
preselection of hysteresis
Δp.
☞ Hysteresis Δp can be changed manually at any time (similar
to changing set point p) by using keys
Δp, see ”Manual set-
ting of hysteresis Δp“.
Two-point control
Manual setting of set point p (boiling point)
➨ Start continuous pumping.
☞ Switch over to continuous pumping by pressing key MODE
if controller is in two-point control mode.
☞ Changing the mode is only possible if process control is
inactive. Display two-point control disappears.
MODE
Semiautomatic determination of set point p (boiling point)
START
STOP
p 267
mbar
ΔΔΔΔΔp 67
mbar
Manual setting of hysteresis
ΔΔΔΔΔp