Technical data

5.4.3. Set values for manual main drying and final drying
Fig. 25 Nominal value set for main drying and final drying
The set values “vacuum” and “safety pressure” are locked against
each other. In this way the input of inadmissible nominal values is
prevented. (Only a certain safety pressure can be selected. The
corresponding temperature of the ice pressure curve of this
pressure must be at least 5K higher than the one of the set value
for the vacuum.)
Valid range of values:
Shelf: -100°C .. +100°C
Vacuum: 0.0010 mbar ... safety pressure – 5°C
Safety pressure: vacuum + 5°C ... 6.110 mbar and Atm
Max. range of values
Shelf: -100°C ... +100°C
Vacuum: 0.0010mbar ... 4.020 mbar
Safety pressure: 0.0023mbar ... 6.110 mbar and Atm
The correlation between the vacuum and the temperature is
shown in the conversion table “Vapor pressure curve above ice” in
chapter 2.1.
5.4.4. Manual defrosting (option)
To defrost the ice condenser, select the phase “Defrosting”
(Manual Æ Special Functions Æ Defrosting) and press
“Run”
to start the defrosting process. During the defrosting
process, the ice condenser chamber is heated electrically by a
heating collar. To finish the defrosting process, press “Standby”
.
If this button is not pressed, the defrosting process will end
52 • LSC Control System Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC