Freeze-dryer Epsilon 1-4 LSCplus
Freeze-dryer Epsilon 2-4 LSCplus
6 Operation
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Version 04/2014, Rev. 2.13 of 01/12/2021
• sb
Translation of the original operating manual
Comparative pressure measurement
see also chapter 6.6.3.1 - "Creating a program", Button ">>more"
During the
→
sublimation
, i.e. when the concentration of water vapour
molecules is rather high in the atmosphere, the value that is provided by
the gas-type-dependent vacuum sensor of the "Pirani" type (e.g. Thyracont
VCP 63) in the drying chamber deviates from the value that is provided by
a capacitive vacuum sensor (e.g. MKS 722B). When the proportion of water
vapour molecules decreases towards the end of the main drying phase, the
two sensors fall increasingly in line with one another. This difference will be
evaluated and used as an indicator for identifying the drying end of the
main drying phase.
USB process recording
see also chapter 6.6.2 - "Manual freeze-drying", section "Dialog box
"Tools""
This feature enables the recording of a running process on a USB storage
medium. After the end of the process recording, the process data can be
viewed on the PC with LyoLogplus and they can be printed. It is also
possible to import the data directly into an Excel file.
Preselection of the aeration medium
see also chapter 6.6.1.3 - " Main window "Options"", section "General"
If the freeze-dryer is equipped with an automatic aeration valve and
automatic valves for media selection, a special medium can be preselected
that is to be used for all of the aeration medium requests as of the start of
the main drying phase.
LyoBalance weighing system
see also chapter 6.6.1.1 - "Main window "Manual"", dialog box "Tools"
The LyoBalance weighing system enables the user to determine the weight
loss of a product during a freeze-drying process. The drying rate that
results from the weight loss provides information concerning the progress
of the freeze-drying process. Thereby, it also helps the user to determine
the end of the freeze-drying process and to optimise the process
parameters.
Wireless product temperature measurement system WTMplus
The wireless product temperature measurement system WTMplus has
been developed mainly for freeze-dryers in the production area. The
sensors are positioned directly in the product. They transfer their
measurement values to an antenna that is integrated in the drying
chamber. This enables the continuous monitoring of all of the phases of the
freeze-drying process.
LyoCam monitoring camera system
The LyoCam monitoring camera system is used to monitor and analyse
freeze-drying processes. A high-quality camera takes pictures of the
product at intervals from several seconds to several minutes. The intervals
are variable depending on the process section. The pictures are linked to
the LPCplus SCADA system for process visualisation and they are
assigned a time stamp in line with other recorded process parameters.
