Martin Christ Epsilon 2-10D LSCplus - Manual (Page 73)

Freeze-dryer EPSILON 2-10D LSCplus
6 Operation
Version 04/2013, Rev. 1.5 of 16/12/2014 • sb
73
Translation of the original operating manual
this limit, the shelf heater will be switched off in order to prevent the product
from thawing due to excessive energy input by the shelf temperature
control system. The LyoControl value is checked only during the main and
final drying phases.
p pressure increase test (option): Depending on the selected mode, the
pressure increase test can also be used as a condition for switching to the
next section (see (see chapter 6.5.3.1 - "Creating a program"), option:
pressure increase test). In the last drying section, two pressure increase
tests will be performed and evaluated. If both values are not greater than
the specified "pressure increase" parameter, the condition for switching to
the next section is fulfilled. If this is not the case, the section will be
extended. If the actual value exceeds the set value before the preselected
time has elapsed, the test will be aborted in order to prevent the product
from thawing.
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.
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 PGM
plus
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. 64: The warm-up phase of the vacuum pump is shifted to the freezing phase prior to the
first drying section
Pos: 156 /01 0 Univ ersal mod ule/Seit enwec hsel @ 0\m od_ 120 211 624 4312 _0. docx @ 10 5 @ @ 1
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”