Freeze-dryer Epsilon 1-4 LSCplus
Freeze-dryer Epsilon 2-4 LSCplus
11 Appendix
Version 07/2022, Rev. 3.0 of 20/07/2022
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Translation of the original operating manual
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11 Appendix
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11.1 Mathematical relations
The automatic processes in the “Programmer module” menu (see chapter
6.6.3 - " Freeze-drying with the PGMplus programmer module ") are based
on the following considerations:
Fig. 78: Graphical representation of the course of the control set value
Calculation of the control set value and of the gradient for the
temperature:
C/min]
[
sec
sec
sec
sec
−
=
tion
current
of
time
tion
tion
previous
of
value
set
tion
current
of
value
set
gradient
C]
[
sec
+
=
gradient
time
section
elapsed
tion
previous
of
value
set
value
set
control
Example:
Section
Set values
Section time [h:min]
Temperature [°C]
Preceding
...
30
Current
1:00
60
C/min
0.5
min
60
30
min
60
30
60
=
=
−
=
C
C
C
gradient
After an elapsed section time of 30 minutes, for example, the control set
value for the temperature is:
C
C/
.
C
value
set
Control
t
=
+
=
=
45
min
5
0
min
30
30
min)
30
(
Calculation of the control set value for the vacuum:
]
[
10
sec
.)
sec
.
(
10
.
sec
(
10
.)
sec
.
(
10
mbar
value
set
control
time
tion
elapsed
section
current
of
time
section
t
prev
value
set
LOG
t
current
value
set
LOG
t
prev
value
set
LOG
−
+
=
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T/°C
t/h
1000
100
10
1
0.1
0.01
0.001
0.0001
+40
+30
+20
+10
0
-10
-20
-30
Pressure/mbar
Set value of the previous section
Course of the shelf temperature
control set value
Set value of the
current section
Previous
section
Current
section
Following
section
