Aalborg PWE Digital - Manual (Page 40)

If a High Alarm occurs, and one of the two optical outputs is assigned to the High
Alarm Event (see Section 4.8) the optically isolated output will be activated when
the flow is more than the High Flow Alarm value. The Flow Alarm condition is also
indicated on the display Process Information Screen by displaying H character. A
typical display with flow meter Process Information Screen and activated High
Flow Alarm settings is shown below.
4.4.4 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. A typical display
with flow meter Flow Alarm Delay settings is shown below.
4.4.5 Flow Alarm Action Latch Tabular entry
The Flow Alarm Action Latch settings controls Latch feature when optically isolat-
ed 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 optically
isolated output is assigned to the Flow Alarm event, in some cases, the Flow Alarm
Latch feature may be desirable.
35
High Flow Alarm
90.0 %F.S.
4.641 Gl/min AH
MT: 67.81 Gal
Flow Alarm Delay
1 Second