Freeze-dryer Epsilon 2-10D LSCplus
6 Operation
Version 07/2022, Rev. 3.0 of 20/07/2022
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Translation of the original operating manual
Conditions for switching to the next section
For all of the program sections to be executed automatically, certain
switching conditions must be fulfilled at the end of each section. If these
conditions are not fulfilled, e.g. due to incorrect set values, a corresponding
process message will be displayed and the section will be extended.
Ice condenser temperature: This value is checked only when the system
switches from freezing (loading) to drying. The ice condenser temperature
must be
-40°C.
Vacuum: This value is checked only during the drying phase. The actual
vacuum can differ from the set value by 20% maximum. In the case of a set
value of 0.001 mbar (final vacuum), there will be no check. In order to reach
the vacuum as quickly as possible, a section time of 1 minute can be
preselected. Since this is not possible in practice, a process message will
be issued for the first time after 15 minutes in this case.
T shelf: This value defines the permissible deviation of the shelf
temperature from the set value. At the end of the section, the actual
temperature of the shelves (in the case of WST shelf 1) will be compared to
the set value. If the shelf temperature is beyond the permissible range, the
section will be extended until the deviation is within the permissible range.
T product: This value defines the permissible deviation of the product
temperature from the set value. By default, the wired product temperature
sensor 1 is used. If the freeze-dryer is equipped with the wireless WTMplus
temperature measurement system, it is also possible to select a different
wired product temperature sensor or a WTMplus sensor (see chapter
6.7.1.3 - "Main window "Options"", section "Administration"/"Sensor
configuration").
During the freezing phase, the product temperature may exceed the set
value by the defined value. In the drying phase, the system will provide a
signal to the user if the actual value lies below the set value by more than
the permissible deviation.
LyoControl-Rx (option with LyoControl LCplus): The value LyoRx defines
the minimum permissible value of the LyoControl sensor (measured by the
LyoControl sensor 1) during the drying phase. If the actual value falls below
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.
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 chapter 6.7.3.1 - "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.
