With the vacuum controllers for indivi-
dual workstations, there is a very high
vacuum in the vacuum connection. In
order to ensure that the desired pres-
sure setpoint is triggered exactly in
extreme cases, it can be started slow-
ly.
Rapid reduction of pressure down
to the desired boiling point (set-
point) + 10 %.
Example:
If the setpoint is 600 mbar, pressure
is lowered to 660 mbar (=600 + 60
mbar).
Within one minute, the desired boi-
ling point (setpoint) is started.
Pressure differential operation.
C Controlled
Pressure Reduction
(see fig. 5).
Vacuum Controller NC 800:
This controlling profile can only be
set in H1 operating mode.
Rapid reduction of pressure down
to desired boiling point (setp.).
From boiling point a gradual reduc-
tion of pressure; reduction rate can
be set by pressure reduction d and
post distillation time t.
Setting values:
see section 4.2
Running:
see section 4.3
4.2 Setting Values
The following operational parameter
can be set for manual operation:
-
Pressure setpoint (SETP);
-
Pressure differential (h) for vacu-
um valve;
-
pressure reduction (d);
-
post distillation time (t).
The "mbar" displays functions
as a dialogue display (flashing) for
entries; the "mode" and "setp"
displays remain unchanged.
Set-up is carried out by using the
SET-key and the UP and DOWN
keys:
SET-key:
Changing readings in this order:
Pressure setpoint
Pressure differential h
pressure reduction d
post distillation time t
actual value.
UP and DOWN-keys:
for changing values.
Run of entering values:
-
SET
-
Input pressure setpoint (mbar)
-
SET
-
Input pressure differential (mbar)
-
SET
-
Input pressure reduction (mbar)
-
SET
-
Input post distillation time (min)
-
SET
For pressure differential operation,
the post distillation time has to be
set „off“ (tOFF).
Range for the input is:
-
Pressure setpoint:
1- 999 mbar;
-
Pressure differential:
1 - 100 mbar;
-
Pressure reduction
:
0 - 100 mbar;
-
Post distillation time:
tOFF - 99 min.
Values entered are automatically
retained after 10 seconds if no
further entries are made; the dis-
play "mbar" changes to the actual
pressure.
Pressure setpoint, pressure diffe-
rential, pressure reduction and
post distillation time can be chan-
ged in manual mode at any time.
The last entered values are
retained once the system is
switched off.
The value inputs can be viewed at
any time (in "mbar" display
flashing):
Pressure setpoint:
Press the SET key once;
Pressure differential:
Press the SET key twice;
Pressure reduction:
Press the SET key three times;
Post distillation time:
Press the SET key four times.
4.3 Running
4.3.1 Controlling
If the Vacuum Controller is in H2
mode, it must first be put in H1
mode (see chapter 4.3.2, item
).
Press MAN key.
The system will evacuate to the
pre-set pressure setpoint and
regulate this level within the
set pressure differential.
Mode, pressure setpoint and
actual pressure are displayed.
Press the STOP key to finish.
4.3.2 Controlling with soft setpoint
start
This controlling profile is only
available for Vacuum Controllers
NBC 800 (vacuum controllers for
individual workstations).
Set to H2 mode:
Turn off the Vacuum Controller.
Press AUTO key and simul-
taneously turn on the Vacuum
Controller.
Display
shows „hpa“.
Press SET key.
Display
shows the current
modus (H1 or H2).
Do not press the SET-Key
instead of the STOP-Key,
because basic settings could
change. However, if you
happen to press the SET-Key,
please press the STOP-Key
afterwards.
Toggle between H1 and H2 with
the up and down keys.
Press the STOP key.
The new pressure unit will be
stored after 5 seconds.
The contoller changes to the
operating mode.
Press the MAN key.
System is evacuated to pre-
selected pressure setpoint
+ 10 %.
The pressure setpoint is started
within one minute.
The system will regulate within
the set pressure differential.
Mode, pressure setpoint and
actual pressure are displayed.
Press the STOP key to finish.
Translation of original Operating Instructions, english, KNF 121205-121650 02/10
5
Содержание Laboport N810
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