Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-67
Rosemount 3490 Series
For details of (MCU) PV, SV, TV, and FV, see “Transmitter inputs to the 3490“
on page 4-13.
P537 Total 2 dec pl (Factory default is 1)
Use this parameter to set the number of decimal places to be shown when
displaying the Totaliser 2 Count (D829).
Menu:
MAIN MENU / MONITOR / [CONTROL UNIT /] READINGS / TOTALISER
D829 Totaliser 2
This parameter displays the Totaliser 2 Count, which is the daily flow total for
the present day. It is reset to zero at midnight.
To add this value to the primary display, see “Primary Display Options“ on
page 4-72. When showing on the Upper display, use the LEFT-ARROW or
RIGHT-ARROW buttons to scroll through daily flow totals from the previous
365 days. The ESCAPE button restores the Upper display to show the daily
flow total value for the present day.
Resetting the totalisers on Model 3493
To reset a totaliser to zero, display the Totaliser Count parameter (e.g. D828),
and then press the button that corresponds to "Reset" option on display line 4.
Totaliser 1 may have password (PIN) protection to prevent unauthorised
persons from re-setting the total. See “PIN Security“ on page 4-75 for full
details of PIN security.
Totaliser 2 does not have password (PIN) protection and may be reset at any
time using the procedure above for parameter D829.
Sampler Relay Output
A Sampler mode relay can be used as a coarse totaliser or as a trigger to an
external event. They output a pulse at a slower rate than a Totaliser relay.
Parameter P535 is a Sampler Factor that defines the frequency of the
Sampler pulse. For example, a value of 100 means that the Sampler relay
outputs a single pulse for every 100th increment to the Totaliser Count
(D828/D829).
The pulse width is the same as selected for the Totaliser relay (P534).
For information on setting up a Sampler relay, see Sections “Relays“ on
page 4-40 and “Totalising examples“ on page 4-68.
Totaliser Wizard
A Totaliser can be set-up easily using the "Totaliser" Wizard, accessible by
navigating to the TOTALISER menu screen.
This Wizard requires the totaliser source parameter (e.g. PV value) to have
suitable units selected (e.g. m
3
/hour). Otherwise, it will display a 'invalid units'
message and then exit to the menu upon pressing the appropriate button.
See “Totalising examples“ on page 4-68 for examples using this Wizard.
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