Christ Alpha 2-4 LSCplus - 11 Appendix; Mathematical Relations

Freeze-dryer Alpha 1-4 LSCplus
Freeze-dryer Alpha 2-4 LSCplus
11 Appendix
96 / 131
Version 01/2011, Rev. 2.3 of 03/07/2017 • sb
Translation of the original operating manual

11 Appendix

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][
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 







 


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