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3)
Deviation Alarm
Also the deviation alarm can only be done on a " Controlling system" because it links the value of the
threshold set point but in some ways is a cross between Process and Band alarm .
For this reasons the deviation alarm acts as a process alarm where the alert threshold is added or removed
from the set point.
Again there are two possibilities:
A)
deviation alarm Up [M > (SP + SA)]
B)
Deviation alarm Down [M < (SP – SA)]
Note:
The band and deviation alarms automatically moving the absolute value of the threshold when you change
the set point value.
The process alarm, however, is indifferent to changes of set points.
pag. 35 di 121
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