Christ Alpha 2-4 LSCplus - Page 68

Freeze-dryer Alpha 1-4 LSCplus
Freeze-dryer Alpha 2-4 LSCplus
6 Operation
68 / 131
Version 01/2011, Rev. 2.3 of 03/07/2017 • sb
Translation of the original operating manual
Vacuum pump warm-up
Apart from the execution of the various sections, the PGMplus programmer
module also controls other tasks that need to be performed during the
process run, e.g. the automatic activation of the vacuum pump.
If the pressure control valve is closed, the PGMplus programmer module
shifts the warm-up phase of the vacuum pump to the freezing phase so that
it is before the first drying section. Since the pressure control valve remains
closed during the warm-up of the vacuum pump, neither the freezing phase
nor the pressure inside the drying chamber will be affected.
The duration of the warm-up phase can be specified separately for every
program (see chapter 6.5.3.1 - "Creating a program").
Fig. 60: The warm-up phase of the vacuum pump is shifted to the freezing phase directly
before the first drying section
T/°C
t/h
100
10
1
0.1
0.01
0.001
+30
+20
+10
0
-10
-20
Pressure/mbar
Section
“freezing”
First
section
“drying”
Warm-up phase
of the vacuum pump
Last
section
“freezing”