page 13 of 36
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.: 99 90 20 / 01/12/2004
➨
Set hysteresis
∆
p by using keys
∆
p
▲
or
∆
p
▼
:
☞
Set mode is activated by pressing key shortly: Set
∆
p ap-
pears.
☞
Short tips toggle in steps of 1 mbar.
☞
Continuous pressing activates ramp: Hysteresis
∆
p changes
with increasing speed.
Continuous pumping
Pumping down until the ultimate vacuum of the pump is
attained
(e. g. pump down to dry the system from volatile liq-
uids):
If the controller is in mode two-point control:
➨
Press key MODE to change to continuous pumping.
☞
Mode change is only possible if the process control is inac-
tive.
☞
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
∆
p.
☞
Hysteresis
∆
p can be manually changed at any time similar
to p by using keys
∆
p, see ”Manual setting of hysteresis
∆
p”.
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.
☞
Mode change 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
∆
∆
∆
∆
∆
p
67
mbar
Manual setting of hysteresis
∆∆∆∆∆
p