Freeze-dryer Alpha 3-4 LSCbasic
12 Glossary
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Translation of the original operating manuel
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12 Glossary
Working range of the vacuum sensor
Deviating from the information provided by the manufacturer, the capacitive
vacuum sensor used for the freeze-drying process can be used within the
following specified working ranges:
Type:
Sensor type
Working range
Measurement error
Pfeiffer CMR363
10 mbar, capacitive
0.05
– 10 mbar
0.02 mbar
Pfeiffer CMR364
1 mbar, capacitive
0.005
– 1 mbar
0.002 mbar
Reference designation
Within the life cycle of industrial systems, a uniform equipment identification
system is required for planning, design, implementation, operation,
maintenance and dismantling so that all of the objects within the system
can be clearly identified at any time. The reference designations (also
known as device tags) are affixed to the equipment or components and
entered into the technical documents (e.g. circuit diagram).
Desorption
Desorption (from Latin de-sorbere, sorbere = sup up, suck in) describes a
phenomenon whereby molecules are released from the surface of a solid.
In order to be able to desorb, the particle must have, or be provided with, a
sufficient amount of energy in order to overcome the binding energy.
Pressure notification
When a certain vacuum value is exceeded (depending on the solvent
mixture to be freeze-dried), the oxygen level of the system increases. As a
result, the risk of an explosive atmosphere inside the system also
increases. The alarm pressure level is a tool with which the user can
increase the safety level when freeze-drying solvent-containing products.
The alarm pressure level is an optional limit value which can be set by the
user and which must be within the working range of the vacuum sensor (1
mbar to 0.005 mbar). When the specified alarm pressure level is reached, a
warning and an optional sound signal are issued and the event is
documented in the error list. The user is responsible for taking the
appropriate measures.
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.
Double-chamber method
Drying on shelves outside the ice condenser chamber is referred to as a
double-chamber system. In freeze-dryers without active shelf cooling, the
samples need to be prefrozen 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.
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