Emerson Rosemount 3490 Series Reference Manual page 118

Getting started
January 2021
Rising level alarm
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Table 4-26: Rising Level Alarm Parameter
Parameter
P490
Related information
Auxiliary functions for relay modes
Rate of change mode relay
Set-up alarms
Pump efficiency alarm (Rosemount 3491 and 3492 only)
Menu
The pump efficiency feature allows an alarm to be indicated (P550, P4*1) if the calculated
pump efficiency falls below a defined limit (P495).
118
SETUP → [CONTROLLER] → APPLICATION → ALARM
Description
R Lev alrm del The Rising Level alarm requires a minimum of one
Assist or Standby mode relay.
If any Standby relay is energized, monitoring of the
rising level is activated. For Assist relays, they must
all be energized for monitoring of the rising level to
be activated.
A timed delay (P490) starts after the monitoring is
activated. If the level is still rising after the delay time
has expired and the calculated rate of change of the
control unit PV (D800) is positive, the result is a
Rising Level alarm condition. The alarm condition
stops as soon as the rate of change is negative,
indicating a falling level.
For the Rising Level alarm to be indicated by a relay
output or the current output, a method must be
selected.
SETUP → [CONTROLLER] → APPLICATION → ALARM
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