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Operating Manual Freeze Dryer
ALPHA 1-4 LD-2 / 2-4 LD-2
, Version 0203, Page 35
5
Description of the Freeze Drying Processes
5.1
Freezing Separately and Drying on Shelves
Possible water residue is removed from the ice condenser chamber. The defrosting
water valve is opened and closed again so that the water residue can be drained. The
ice condenser chamber should be wiped If necessary.
For pre-cooling the ice condenser the
ALPHA 1-4 LD-2 / ALPHA 2-4 LD-2
is switched
on.
The rack is put onto the bottom plate. For smaller samples it is advisable to pre-cool
the shelves in order to avoid a partial thawing during the evacuation process.
As soon as the shelves with the pre-frozen samples have been put in, the unit is
sealed with the drying chamber and the vacuum pump is switched on.
5.2
Drying with Sealing Device
With the sealing device injection bottles can be sealed with ribbed rubber stoppers on
one or two shelves under vacuum or inert gas. To do this the shelves are moved
against each other by a pressure plate using a spindle.
The height of the pressure plate must be adjusted according to the height of the
bottles. The screw for height adjustment is removed.
The threaded rod is screwed into the lower shelf until its slotted head is even with the
black balls of the guide rod.
Then the pressure plate is fastened with the adjustment screw in such a way that it will
rest on or slightly above the rubber stopper. When using two shelves the lower one as
well as the pressure plate are put directly or immediately above the rubber stoppers.
Instead of the stopper the vacuum-tight rotary leadthrough is put into the standard
ground socket of the acrylic chamber. Before inserting, the ground-in surface of the
leadthrough is greased with vacuum grease.
After completion of the drying process the lever of the rotary leadthrough is turned to
the right until a resistance is felt.
For the sealing of the bottles all shelves must be completely filled. For small quantities
at least three spacers must be evenly put on each shelf (according to the height of the
bottles with rubber stoppers).
The appropriate spacers are available on request.
Summary of Contents for 101041
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