Emerson Rosemount 3490 Series Reference Manual page 81

Reference Manual
00809-0100-4841
3
to m
3
m (on bottom line). The transmitter base units must be set to meters.
Table 4-3: Pre-programmed Flow Calculation Factors (Parshall Flumes)
Profile (P113 or P123)
Parshall 1-in
Parshall 2-in
Parshall 3-in
Parshall 6-in
Parshall 9-in
Parshall 1 ft
Parshall 1.5 ft
Parshall 2 ft
Parshall 3 ft
Parshall 4 ft
Parshall 5 ft
Parshall 6 ft
Parshall 8 ft
Parshall 10 ft
Parshall 12 ft
Related information
Optional change: transmitter input channel settings (advanced users)
Using a plotted profile for calculating volume or flow
When parameter P113 (or P123) is set to "special", the parameter P115 (or P125) is used
for defining a 20-point look-up table that represents the profile of a vessel or open flow
channel that is not in the control unit library.
Note
When using the App Wizard, select 20 point look-up at the prompt for a profile.
Each point is a Cartesian co-ordinate (X, Y). The X value represents a level, and the Y value
is the corresponding volume or flow rate. The X points are at user-defined intervals,
typically in equal increments (5%) of maximum height.
These X points may be entered as levels (in the same units as the transmitter) and the Y
points entered as the corresponding volumes or flow rates for those levels (in the same
units as selected for the control unit Primary/Process Value). See
graph.
Emerson.com/Rosemount
/hr and the display configured to show the SV (level in cm on top line) and totalizer in
Pwr (P115 or P125) k (P115 or P125)
1.550 151.7
1.550 303.4
1.547 445.2
1.580 924.5
1.530 1378
1.522 1795
1.538 2693
1.550 3590
1.566 5386
1.578 7181
1.587 8976
1.595 10770
1.607 14360
1.600 17672
1.600 20982
Getting started
mul (P115 or P125) P116 (or P126)
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
1.0 1.0
Figure 4-18, right-hand
January 2021
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