Navigator 500
Sodium analyzer
7 Menu descriptions
54
OI/ASO550–EN Rev. G
7.1.6 Process Alarm
Process alarm examples
Used to configure up to 8 independent process alarms.
Menu
Comment
Default
Alarm 1 to 8
Source
Selects the analog value for the process alarm source.
None
Type
Selects the alarm type from:
High Process
Low Process
High Latch
High Latch
High Process
Tag
The alarm
Tag
is displayed as a diagnostic message and appears in the
Diagnostic Status Bar
and on the
Diagnostic View
page at
Operator
level –
see page 31.
Alarm <n>
Trip
The alarm trip level in engineering units.
0.0
Hysteresis
The hysteresis trip level in engineering units. Activated at the alarm trip level
but deactivated only when the process variable has moved into the safe
region by an amount equal to the hysteresis value – see Process alarm
examples below.
0.0
Time Hysteresis
If an alarm trip value is exceeded, the alarm does not become active until
the
Time Hysteresis
value has expired. If the signal goes out of the alarm
condition before the
Time Hysteresis
has expired, the hysteresis timer is
reset.
0
Fig. 7.2 High and low process alarm action
Fig. 7.3 High and low latch alarm action
Menu
Process Alarm
Exit
Select
Trip point
Process variable
Alarm on
Alarm off
Alarm on
Alarm off
High process
Low process
Hysteresis
Hysteresis
Alarm on
Alarm off
Hysteresis
Alarm latched
Alarm acknowledged by operator
Alarm acknowledged by operator
Alarm off
Trip point
Alarm On
Hysteresis
Alarm latched
High latch alarm
Low latch alarm
Trip point
Process
variable
Process Variable