Emerson Rosemount 3490 Series, Reference Manual

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to m
3
/hr and the display configured to show the SV (level in cm on top line) and totalizer in
m
3
(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) Pwr (P115 or P125) k (P115 or P125) mul (P115 or P125) P116 (or P126)
Parshall 1-in 1.550 151.7 1.0 1.0
Parshall 2-in 1.550 303.4 1.0 1.0
Parshall 3-in 1.547 445.2 1.0 1.0
Parshall 6-in 1.580 924.5 1.0 1.0
Parshall 9-in 1.530 1378 1.0 1.0
Parshall 1 ft 1.522 1795 1.0 1.0
Parshall 1.5 ft 1.538 2693 1.0 1.0
Parshall 2 ft 1.550 3590 1.0 1.0
Parshall 3 ft 1.566 5386 1.0 1.0
Parshall 4 ft 1.578 7181 1.0 1.0
Parshall 5 ft 1.587 8976 1.0 1.0
Parshall 6 ft 1.595 10770 1.0 1.0
Parshall 8 ft 1.607 14360 1.0 1.0
Parshall 10 ft 1.600 17672 1.0 1.0
Parshall 12 ft 1.600 20982 1.0 1.0
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
Figure 4-18 , right-hand
graph.
Reference Manual Getting started
00809-0100-4841 January 2021
Emerson.com/Rosemount 81