Emerson Rosemount 3100 Series, Reference Manual, Page: 121 / 144

Reference Manual
00809-0100-4840, Rev. BA
July 2008
F-7
Rosemount 3100 Series
To derive up to 10 profile points, it is necessary to have tabulated or graphical
data to relate the required Process Value (PV) to Liquid Height.
Figure F-2 on page F-7 shows an example graph of PV versus Liquid Height.
Parameters P030 to P039 are for entering up to 10 Y-axis values, actual
percentages, which correspond to the 10 fixed percentages on the X-axis,
and determines the plotted points.
For example, 60% of the maximum height (P014) will relate to a percentage of
the maximum PV (P013). This percentage, say 50%, is entered into P035.
The transmitter will interpolate linearly between the plotted points to give an
accurate curve fit, which will determine the output PV from the live level
measurement.
Setting-up Procedure for “Special”:
1. Select units for the PV using P012.
2. Draw the graph of PV versus Liquid Height.
3. Choose the maximum point on the graph where measurements will be
required.
4. Set P014 to liquid height (on X-axis) at this maximum point.
5. Set P013 to the flow rate or content (on Y-axis) at this maximum point.
6. Set P010 to the distance from the transmitter face to the zero point (Y = 0)
on the graph.
7. Use parameters P030 - P039 to enter percentage values that correspond
to the fixed percentages.
Figure F-2. First graph of PV
versus Height