Operating Manual Freeze Dryer ALPHA 1-2 LDplus Description of the Freeze Drying Processes • 21
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 the shelf 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 inserted
rubber stoppers).
The appropriate spacers are available upon request.
3.3. Separate Freezing and Drying of Liquids in
Flasks (Process B)
Possible water residue is removed from the ice condenser
chamber. The drain valve is opened so that the water residue can
drain off. The ice condenser chamber should be wiped out if
necessary.
The refrigeration compressor and the vacuum pump are activated
via the control system to start the pre-freezing of the ice condenser
and the warming-up of the vacuum pump. The valve is closed
during warming-up of the pump. In case the unit is not equipped
with an electromagnetic pressure control valve we recommend to
use a manual stop valve. Without such a valve the vacuum pump
must not be warmed up.
Several manifolds and mountable drying chambers with several
connections for rubber valves are available for the drying process
outside the ice condenser chamber (see accessories catalogue).
The drying chamber with connections for rubber valves is mounted
directly to the sealing ring of the base plate. Manifolds with outer
ground joints NS 45/40 are connected via the ground-in socket of
the acrylic lid.
In order to ensure a vacuum-tight connection and to simplify the
removal of the named accessories the ground-in surface must be
slightly greased with vacuum grease before use. The manifold or
drying chamber is mounted afterwards and turned by 360° for an
even distribution of the grease.
The ground-in surfaces have to be cleaned and greased before
every further mounting of accessories.
Before the drying process can start it is necessary to check that all
valves are closed.
To start the drying process, the main drying process has to be
activated in the control system. The pressure control valve opens
and the main drying process starts.
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