Freeze-dryer Alpha 3-4 LSCbasic
12 Glossary
92 / 97
Version 11/2018, Rev. 1.2 of 05/03/2019
• sb-pe
Translation of the original operating manuel
Single-chamber method
(not available for freeze-dryers with an LSCbasic control system)
With the single-chamber method, the freezing as well as the subsequent
drying of the product take place inside the ice condenser chamber. The
sample is frozen as a result of the low temperature of the ice condenser
(-55°C in the case of single-stage systems or -85°C in the case of double-
stage systems). During this process, the inside of the chamber can be
cooled down to approx. -20°C or -40°C. The moderate supply of the frozen
sample with energy, which is necessary during the main drying phase, is
ensured by heatable shelves on which the product is placed.
Sublimation
Sublimation (from Latin "sublimis" = high up in the air, raised) is a
thermodynamic process of the direct transition of a substance from the
solid phase to the gas phase.
