Owner manual
Gamma 1-16 LSC&
Gamma 2-16 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. 73: 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][
secsec
secsec
tioncurrentoftimetion
tionpreviousofvaluesettioncurrentofvalueset
gradient
C][sec gradient time sectionelapsedtionpreviousofvaluesetvaluesetcontrol
Example:
Section
Set values
Section time [h:min] Temperature [°C]
Preceding ... 30
Current 1:00 60
C/min 0.5
min60
30
min60
3060
CCC
gradient
After an elapsed section time of 30 minutes, for example, the control set
value for the temperature is:
C C/.CvaluesetControl
t
45min50min3030
min)30(
Calculation of the control set value for the vacuum:
][ 10
sec
.)sec.(10.sec(10
.)sec.(10
mbarvaluesetcontrol
timetionelapsed
sectioncurrentoftimesection
tprevvaluesetLOGtcurrentvaluesetLOG
tprevvaluesetLOG
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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