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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
percentage of the maximum PV on the Y-axis. The related percentage, say 55%, is entered into
parameter Profile Point 6.
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 (height) measurement.
Each live level measurement is converted into a percentage (0 to 100%), which is proportional to
the maximum height. In graph terms, the converted percentage corresponds to an X ordinate
on the X-axis. Using this X ordinate, the Y ordinate is then calculated to get a percentage
proportional to the maximum PV. This percentage is multiplied by the maximum height to get
the output process value (PV).
Setting-up procedure for “Special Plot” option:
1. Select the displayed (reported) units for the output PV (see page 120).
2. Draw the graph of PV versus Liquid Height, and note the maximum points.
3. Enter the maximum liquid height into Profile Height (page 122).
4. Enter the maximum volume or flow into PV Scale Factor (page 121).
5. Enter the distance from the transmitter face to the zero point (Y=0) into the
Bottom Reference parameter (page 105).
6. Use parameters Profile Point 1 (P030) to Profile Point 10 (P039) to enter the
percentage values that relate to the X-axis fixed percentages.
Note
The origin (0,0) is always used as the start point. It is not a parameter.
It is possible the process value (PV) at the maximum height is less than 100% of the
maximum volume or flow. (See Figure F-4 on page 114).