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...4 CONFIGURATION MODE
...4.3.2 Alarms – Figs. 4.3, 4.4, 4.5 and 4.6
Process
Variable
Alarm On
Alarm Off
Note.
Process Alarms
above the high process alarm trip point value or falls below the low process
alarm trip point value. Process alarm trip point values are configured in
engineering units in Set Up Level (Level 2). If an alarm hysteresis value of
zero is configured the alarm becomes inactive when the process variable
value returns past the alarm trip point value. If a positive or negative
hysteresis value is configured the alarm becomes inactive when the process
variable reaches the hysteresis point. The hysteresis value is configured in
engineering units e.g. if a hysteresis point five inches H
trip point is required, a hysteresis value of –5.0 is configured. The
programmable alarm hysteresis function can also be utilized for pump
control applications when an output relay is assigned to an alarm.
22
Hysteresis
High Process
– an alarm becomes active when the process variable rises
Fig. 4.4 Process Alarms
Hysteresis
Low Process
0 below the alarm
2
Trip
Point
Alarm
On
Alarm
Off
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