Freeze-dryer Beta 1-8 LSCplus
Freeze-dryer Beta 2-8 LSCplus
11 Appendix
Version 04/2013, Rev. 2.9 of 09/03/2020
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Translation of the original operating manual
Step-by-step instructions
– drying in a flask
1
Freeze the sample separately, e.g. in a deep-freeze.
NOTE
Ensure that the layer thickness of 1 to 2 cm is not exceeded, since
otherwise the drying time needs to be extended.
2
Check the ice condenser chamber and ensure that is completely free
from water residues.
3
Install the drying chamber. Prior to doing so, check whether the O-ring
is completely free of dirt particles. The ground-in stopper of the acrylic
glass bell must be greased with high-vacuum grease.
4
Ensure that all of the valves are closed.
5
Let the vacuum pump warm up 20 to 30 minutes before the freeze-
drying processes commences.
6
Connect a frozen sample to a valve.
CAUTION
After the pressure has fallen below 1.030 mbar, a frozen sample can be
connected to a valve. The next frozen sample cannot be connected to
another valve until the pressure is again lower than 1.030 bar.
NOTE
After the pressure has fallen below 1.030 mbar, a frozen sample can be
connected to a valve. The next frozen sample cannot be connected to
another valve until the pressure is again lower than 1.030 bar.
7
The operating panel displays the vacuum, the ice condenser
temperature, and the current operating mode.
8
The end of the process is reached when the ice condenser is no longer
loaded and when it again reaches a final temperature of approximately -
50°C to -54°C. The pressure decreases as a function of the ice
condenser temperature.
NOTE
The drying time depends on the layer thickness of the sample, the solids
content of the sample, and the amount of heat that is supplied during the
drying process. In the case of a layer thickness of 1 cm, the freeze-drying
process usually takes 24 hours.
9
Switch the vacuum pump off and aerate the drying chamber via the
condensate drain valve or via a rubber valve.
10
Switch the unit off by actuating the mains power switch and take the
product out of the freeze-dryer.
11
Switch the unit on again and start the defrosting process (button
"Operating mode: select/start"
– "Defrosting").
