1 mathematical relations, 11 appendix – Martin Christ Beta 2-8 LSCplus User Manual
Page 91
Beta 1-8 LSC&
Beta 2-8 LSC&
11 Appendix
Version 04/2013, Rev. 1.1 of 16/12/2013 • sb
91
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
6.5.3 - "Option: freeze-drying with the PGMplus programmer module")
are based on the following considerations:
Fig. 74: 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