1
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4
-DIN,
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8
-DIN &
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16
- DIN Controllers & Indicators - Product Manual
59305, Issue 5 – March 2005 Glossary Page 107
Alarm Hysteresis Type: General Parameter
An adjustable band on the “safe” side of an alarm point, through which the process variable
must pass before the alarm will change state, as shown in the diagram below. E.g. a high
alarm’s hysteresis band is below the high alarm value, and a low alarm’s hysteresis is above
the low alarm value.
Also refer to Alarm Operation.
Figure 41. Alarm Hysteresis Operation
PROCESS
HIGH ALARM
PROCESS
LOW ALARM
BAND ALARM
DEVIATION
HIGH ALARM
DEVIATION
LOW ALARM
Inactive
Inactive
Inactive
Inactive
Inactive
Inactive
Alarm Inactive Alarm Inactive
Alarm Active
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