Aalborg Vortex - Manual (Page 33)

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b) Flow Alarm Conditions Tabular entry
Flow Alarm can be assigned to Volumetric or Mass Flow reading.
c) Low Flow Alarm Numerical entry
The limit of required Low Flow Alarm value can be entered in increments
of 0.1% from 0 - 100%F.S.
If a Low Alarm occurs, and one of the two optical outputs is assigned to the Low
Flow Alarm Event (see paragraph 5.3.5.2) the optically isolated output will be
activated when the flow is less than the Low Flow Alarm value.
The Low Flow Alarm condition is also indicated on the corresponding Process
Information Screen by displaying L character.
d) High Flow Alarm Numerical entry
The limit of required High Flow Alarm value can be entered in currently
active Volumetric or Mass Flow units.
If a High Alarm occurs, and one of the two optical outputs is assigned to the High
Flow Alarm Event (see Section 5.3.6.2) the optically isolated output will be acti-
vated when the flow is more than the High Flow Alarm value. The High Flow Alarm
condition is also indicated on the corresponding Process Information Screen by
displaying H character.
e) Flow Alarm Action Delay Numerical entry
The Flow Alarm Action Delay is a time in seconds that the Flow rate value
must remain above the high limit or below the low limit before an alarm
condition is indicated. Valid settings are in the range of 0 to 3600 seconds.
f) Flow Alarm Action Latch Tabular entry
The Flow Alarm Action Latch settings controls Latch feature when optically
isolated outputs are assigned to Flow Alarm event. Following settings are
available: Disable or Enabled.
By default, flow alarm is non-latching. That means the alarm is indicated
only while the monitored flow value exceeds the specified set conditions. If
NOTE: If Flow Alarm Conditions were changed, make sure to adjust
Low and High Flow Alarm settings in corresponding flow Engineering
Units.
NOTE: Note: The value of the Low Flow Alarm must be less than the
value of the High Flow Alarm.
NOTE: The value of the High Flow Alarm must be more than the value
of the Low Flow Alarm.