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
- 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.
* insignificant during automatic opera-
tion.
Values entered are automatically
retained after 10 seconds if no
further entries are made; the dis-
play "mbar" changes to the actual
pressure.
Pressure differential, pressure
reduction and post distillation time
can be altered in automatic mode,
however not until the first boiling
point has been achieved.
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 differential:
Press the SET key twice;
Pressure reduction:
Press the SET key three times;
Post distillation time:
Press the SET key four times.
5.3 Running
Press AUTO key.
In the "mode" display "A1" appears
and the start-up level of 600 mbar.
The SET key, the UP key and the
DOWN key can not operated.
The vacuum controller searches for
the first boiling point step by step
and with short gaps.
Once the first boling point has
been achieved, the code "bP" for
"boiling point" appears on the
"mode" display.
The value found (first boiling point)
becomes the pressure set-point.
If no values for pressure reduction
d and post distillation time t have
been stored, the controller regula-
tes the new pressure setpoint until
this process is halted by pressing
the STOP button.
If values for pressure reduction d
and post distillation time t are sto-
red, the pressure will be reduced
after the distillation point has been
found.
"Mode“ display shows status
"bP". Alternating with "bP" the re-
maining post distillation time
appears in minutes.
When the pressure has been re-
duced:
- the controller switches off;
-display „mode“ shows „End“;
-a signal sounds ( 3 x 10 seconds)
-the vacuum valve closes, the
system remains under vacuum.
Press the STOP key to finish.
If the system is to be restarted eg.
in order to distill the solvent using
the next lowest boiling pressure,
after having pressed the STOP key
(and possibly changing the d and t
values), the AUTO key has to be
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