Instruction Manual
Freeze-dryer EPSILON 1-4 LSCplus
Freeze-dryer EPSILON 2-4 LSCplus
2 Layout and mode of operation
22
Version 04/2014, Rev. 1.4 of 09/12/2014 • sb
Translation of the original operating manual
2.2.2.5 End of drying and aeration
The end of the drying process is reached when both the product and shelf
temperature are clearly in the positive range (+15 to +20°C) and if their
difference is not greater than 5 K.
Another indication of the end of the drying process is the behaviour of the
vacuum and of the ice condenser temperature. The ice condenser is no
longer subject to load and reaches the final temperature of approximately -
55°C or -85°C. The pressure in the drying chamber decreases in
accordance with the ice condenser temperature.
The vacuum pump will be switched off and the drying chamber will be
aerated via a rubber valve or via the aeration valve. The aeration valve can
also be used to flood the unit with nitrogen or another inert gas instead of
ambient air.
Then, the product can be removed from the unit.
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2.2.2.6 Defrosting
Defrosting by way of the shelf heater
The ice condenser can be defrosted at room temperature.
In addition, the freeze-dryer can be defrosted via the heatable shelf. For
this purpose, the shelf is heated to a specific value for a predefined time.
The heat emission from the shelf accelerates the defrosting process.
In order to avoid damage, the stainless steel bowl with the liquid must be
removed directly after the completion of the defrosting process. Then, wipe
the chamber dry in order to remove any remaining water.
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