Martin Christ Epsilon 2-6D LSCplus - Manual (Page 72)

Freeze-dryer EPSILON 2-6 LSCplus
6 Operation
72
Version 10/2012, Rev. 1.6 of 16/12/2014 • sb
Translation of the original operating manual
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 (measured by product sensor 1) from the set value. 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.
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").