Emerson Rosemount 3490 Series Reference Manual page 125

Reference Manual
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Set-up totalizing on the Rosemount 3491
Menu
Totalizer (cumulative totalized flow) on the Rosemount 3491
The Rosemount 3491 has an internal 8-digit totalizer that is updated several times every
second.
Note
The totalizer operates with an input of the control unit PV (D800) in units per second.
When the PV is a volumetric flow rate (e.g. m
flow volume and give the total volume throughput.
Table 4-32: Totalizer Parameters
Parameter
P530
P531
P534
D828
Emerson.com/Rosemount
SETUP → [CONTROLLER] → OUTPUT → TOTALIZER and
MONITOR → [CONTROLLER] → READINGS → TOTALIZER
Description
Total Factor One count is added to the Totalizer Count (D828) for
a quantity of liquid as defined by this parameter. The
display units for D828 is defined by P531.
Total Units This parameter defines the units for the Totalizer
Count (D828).
When using totalizer units of gal, an 8-digit totalizer
increments rapidly and rolls over too frequently. To
help, alternative totalizer units of galx10, galx100,
galx1000, and Mgal are available for selection. When
these special units are selected after selecting gal
units, the totalizer factor (P530) is automatically re-
scaled by x10,x100, x1000, or x1000000 depending
on the selection. Similarly, re-scaling is automatic for
ltrx10, ltrx100, etc. after selecting ltr as totalizer
units.
See Using the App Wizard to set-up a flow
application
100 totalizer units are needed.
Pulse Width A Totalizer mode relay is energized for a
programmed duration (P534) each time the
Totalizer Count (D828) is incremented. Parameter
P534 controls the pulse width (i.e. the pulse 'on'
time) and is between 10 ms and 2.5 s, changeable in
steps of 10 ms.
Parameter P534 also defines the pulse width for a
Sampler mode relay (see
See Set-up the relays
mode relays.
Totalizer This parameter displays the Totalizer Count. To add
this to the Full PV Display, see
options.
3
/hour), the totalizer can accumulate this
for a flow application example where galx
Set-up the relays).
for information on Totalizer
Display configuration
Getting started
January 2021
Factory default
0.0
None
100 ms
N/A
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