Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-65
Rosemount 3490 Series
P534 Pulse Width (Factory default is "100ms")
A Totaliser relay is energised for a programmed duration (P534) each time a
Totaliser Count (D828/D829) is incriminated. Parameter P534 controls the
'On' time and 'Off' time - i.e. the pulse width - and may be a value of between
10ms and 2.5s, changeable in steps of 10ms.
The rate at which the unit can output a totaliser pulse is entirely dependent on
the pulse width. Parameter P534 also determines the width of a pulse that is
output by a Sampler relay - see “Sampler Relay Output“ on page 4-67.
P536 Totaliser 2 Source (Factory default is "None")
If requiring Totaliser 2, select a parameter to be totalised.
Menu:
<MAIN MENU>/<MONITOR>/[<CONTROL UNIT>/] <READINGS>/ <TOTALISER>
D828 Totaliser 1
This parameter displays the Totaliser 1 Count. To add this to the primary
display, see “Primary Display Options“ on page 4-72.
D829 Totaliser 2
This parameter displays the Totaliser 2 Count. To add this to the primary
display, see “Primary Display Options“ on page 4-72.
Resetting the totaliser
To re-set a totaliser to zero, display the Totaliser Count parameter e.g. D828,
and then press the button corresponding to "Reset" on display line 4.
About Totalising on
Model 3493
Model 3493 has two totalisers:
Totaliser 1 (Cumulative totalised flow) on Model 3493
This is an 8-digit totaliser showing cumulative totalised flow through a flow
structure. It can only be re-set manually.
Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER
P530 Total 1 Factor (Factor default is 0.0)
One count is added to the Totaliser Count (D828) for a quantity of liquid as
defined by this parameter. The display units for D828 is defined by P531.
P531 Total 1 Units (Factory default is "None")
This parameter defines the units for the Totaliser Count (D828).
When using units of gal (US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10, galx100, and galx1000 are available for selection. When these
special units are selected after selecting gal units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection
P534 Pulse Width (Factory default is "100ms")
A Totaliser relay is energised for a programmed duration (P534) each time the
Totaliser Count (D828 / D829) is incremented. Parameter P534 controls the
'On' time and 'Off' time - i.e. pulse width - and may be a value of between
10ms and 2500ms (0.01 to 2.5 seconds), changeable in steps of 10ms.
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