Technical data

3. Description of the Freeze
Drying Processes
3.1. Freezing and drying inside the ice condenser
chamber (process A) on a temperature-
controlled shelf
First, 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 unit and the vacuum pump are activated via the
control system to pre-cool the ice condenser and to warm up the
vacuum pump. The valve is closed during the warm-up of the
vacuum pump. In case the unit is not equipped with an
electromagnetic pressure control valve, we recommend using a
manual stop valve. Without such a valve, the vacuum pump
cannot be warmed up.
With the sealing device (option), injection bottles can be sealed
with serrated rubber stoppers inside the ice condenser chamber
under vacuum or inert gas. To do this, the shelves are moved
against each other by a pressure plate using a spindle. (When
drying inside the ice condenser chamber, only 1 shelf can be used.
When drying outside the ice condenser chamber, a maximum of 4
shelves can be used.)
After completion of the drying process, the lever of the rotary
leadthrough is turned to the right until a resistance is felt.
Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC Description of the Freeze Drying Processes • 19