Description Of The Freeze Drying Processes; Separate Freezing And Drying Outside The Ice Condenser Chamber (Process B) On Shelves - Fisher ALPHA 1-2 LDplus Operating Manual

3. Description of the Freeze
Drying Processes
3.1. Separate Freezing and Drying Outside the Ice
Condenser Chamber (Process B) on Shelves
Operating Manual Freeze Dryer ALPHA 1-2 LDplus
It is also possible to dry the product outside the ice condenser
chamber. In this case, the product has to be frozen e.g. in a deep-
freeze.
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
Description of the Freeze Drying Processes • 19