Martin Christ Delta 2-24 LSCplus - Manual (Page 65)

Delta 1-24 LSC&
Delta 2-24 LSC&
6 Operation
Version 04/2013, Rev. 1.2 of 20/02/2014 • sb
65
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.
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 of the shelf. 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 Lyo Control LC
plus
): The value LyoRx defines the
minimum permissible value of the LyoControl sensors 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 (siehe (see chapter 6.5.3.1 - "Creating a program"), Option:
Druckanstiegstest). 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.