Martin Christ Epsilon 2-10D LSCplus - Manual (Page 130)

Freeze-dryer EPSILON 2-10D LSCplus
12 Glossary
130
Version 04/2013, Rev. 1.5 of 16/12/2014 • sb
Translation of the original operating manual
Pressure increase test
The pressure increase test can only be carried out with double-chamber
method. During the pressure increase test, the intermediate valve prevents
the flow of steam from the drying chamber to the ice condenser so that the
water vapour of the sublimation cannot flow off. The result is a more or
less distinct pressure increase that is measured in the product chamber.
When the product has been completely dried, the vacuum does not
decrease at all or only to a slight extent.
The pressure increase test is often used as a criterion for the automatic
switching from the main drying phase to the final drying phase as well as
for identifying the end of the process.
Reference designator
During the service life of industrial systems, a standardised reference
designation system is required for the planning, design, realisation,
maintenance, and disassembly stages in order to be able at all times to
identify every single component within the system in an unambiguous
manner. The reference designators are affixed to the components and
entered into the technical documentation (e.g. circuit diagrams).
Safety pressure
Since the vacuum has a dominating influence on the product temperature,
Martin Christ Gefriertrocknungsanlagen GmbH has integrated a so-called
safety pressure feature into the freeze-dryers in order to ensure the
protection of the product. If the pressure inside the drying chamber
increases too strongly so that it exceeds the safety limit, the energy supply
of the shelves will be interrupted and the sublimation process slows down.
This prevents the product from melting.
The safety pressure value that is entered should correspond to a
temperature value that is 5°C below the melting point of the product on the
vapour pressure curve above ice.
Single-chamber method
At the single-chamber method, the freezing as well as the subsequent
drying of the product are both performed on several temperature controlled
shelves inside the ice condenser chamber.
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.
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