Aalborg Vortex - Manual (Page 36)

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corresponding values of high and low pressure alarm levels. Alarm action can be
assigned with preset delay interval (0-3600seconds) to activate the optically iso-
lated output (separate for High and Low alarm). Latch Mode control feature allows
each optical output to be latched on or follow the corresponding alarm status.
Following settings are available for Pressure Alarm (see Figure 5.8):
a) Pressure Alarm Mode Tabular entry
This function determines whether Pressure Alarm is Enabled or Disabled.
The following selections are available: Enabled or Disabled. The default
entry is Disabled. Alarm Mode selections can be set with the Up and Dn
buttons and are accepted by pressing ENT button.
b) Low Pressure Alarm Numerical entry
The limit of required Low Pressure Alarm value can be entered in
currently active Pressure Engineering units.
If a Low Pressure Alarm occurs, and one of the two optical outputs is
assigned to the Low Alarm Event (see paragraph 5.3.5.2) the optically
isolated output will be activated when the process pressure is less than
the Low Pressure Alarm value. The Low Pressure Alarm condition is also
indicated on the corresponding Process Information Screen by displaying
L character.
c) High Pressure Alarm Numerical entry
The limit of required High Pressure Alarm value can be entered in
currently active Pressure Engineering units.
If a High Alarm occurs, and one of the two optical outputs is assigned to
the High Alarm Event (see paragraph 5.3.5.2) the optically isolated output
will be activated when the process Pressure is more than the High
Pressure Alarm value. The Pressure Alarm condition is also indicated on
the corresponding Process Information Screen by displaying H character.
d) Pressure Alarm Action Delay Numerical entry
The Pressure Alarm Action Delay is a time in seconds that the Pressure
reading value must remain above the high limit or below the low limit
NOTE: The value of the Low Pressure Alarm must be less than the
value of the High Pressure Alarm.
NOTE: The value of the High Pressure Alarm must be more than the
value of the Low Pressure Alarm.