Martin Christ Delta 2-24 LSCplus - Manual (Page 122)

Delta 1-24 LSC&
Delta 2-24 LSC&
12 Glossary
122
Version 04/2013, Rev. 1.2 of 20/02/2014 • sb
Translation of the original operating manual
Double-chamber method
Drying on shelves outside the ice condenser chamber is referred to as a
double-chamber system. The advantage compared to the single-
chamber method is the considerably higher product capacity. In addition,
the product chamber can be isolated from the ice condenser chamber by
an intermediate valve in order to perform a so-called pressure increase
test for determining the end of the drying process. In freeze-dryers without
an active shelf cooling, the samples need to be pre-frozen externally, e.g. in
a deep-freeze or freezer cabinet. After the transfer of the product into the
freeze-dryer, the actual sublimation is started.
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.
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.
Wireless Shelf Technology
With the Wireless Shelf Technology (WST), Martin Christ Gefrier-
trocknungsanlagen GmbH has developed a system for laboratory freeze-
dryers that works without cable connections at the electrically heated
shelves and other equipment parts. Instead, a connection plate with two
electrical contacts is placed between the ice condenser chamber and the
external drying chamber. This plate is the central plate for the connection of
the accessories. Every electronic accessory is equipped with a separate
module. These modules enable the combination of various components.
=== E nde der Liste für Tex tma rke I nhal t = ==