Freeze-dryer Epsilon 2-10D LSCplus
6 Operation
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Version 07/2022, Rev. 3.0 of 20/07/2022
• sb
Translation of the original operating manual
T comparative (option): This value indicates the difference between a
Pirani sensor and a capacitive vacuum sensor in per cent based on the
actual value of the capacitive vacuum sensor. When the sublimation rate
decreases, the difference decreases as well. As a result, the value is an
indicator for determining the drying end of the main draining phase. If the
set value is not reached by the end of the main drying phase, the section
will be extended.
NOTE
If only capacitive sensors are permissible (e.g. for freeze-drying solvent-
containing products), comparative pressure measurement is not possible.
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 6.7.3.1 - "Creating a program").
Fig. 58: The warm-up phase of the vacuum pump is shifted to the freezing phase prior to 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”
