Freeze-dryer Alpha 1-4 LSCplus
Freeze-dryer Alpha 2-4 LSCplus
Version 01/2011, Rev. 2.3 of 03/07/2017 • sb
Translation of the original operating manual
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.
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
media 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").
Ensure that no water gets into the pipe connection of the vacuum pump or
vacuum sensor.
12 Drain the defrosting water via the defrosting water valve on the left-hand
side of the unit. To do so, connect a hose to the hose connector and
collect the defrosting water in a suitable vessel.
13 Keep the freeze-dryer open (i.e. without the lid or drying chamber) when
it is not in use so that moisture can evaporate. This increases the
service life of the vacuum sensor.
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