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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
F.3.12 Contents (volume) measurement
There are five shape options available to select, including:
Tank Shape/NLP (P011) = “Linear” (see page 112)
Tank Shape/NLP (P011) = “Special Plot” (see page 112)
Tank Shape/NLP (P011) = “Horizontal Cyl Flat” (see page 115)
Tank Shape/NLP (P011) = “Spherical” (see page 115)
Tank Shape/NLP (P011) = “Horizontal Cyl Dome” (see page 115)
Tank Shape/NLP (P011) = “Linear”
This default setting is for level or volume (content) measurements involving a tank with a
constant cross-section. When “Linear” is selected, the level or volume is the liquid height
above the zero level multiplied by a scaling factor. If volume is not required, the Scale Factor
parameter (page 121) is set to 1.0 unless requiring other measurement units for the output PV.
The volume of the contents is calculated by entering the volume-per-meter of height into the
Scale Factor parameter (page 121). If the liquid level is being measured in feet or inches, enter
the volume-per-feet or volume-per-inch respectively.
Tank Shape/NLP (P011) = “Special Plot”
When selecting “Special Plot”, parameters Profile Point 1 to 10 (page 124) can be edited
to plot the unique profile of an irregular shaped tank or open channel (see Figure F-2).
Figure F-2. Two-stage weir cross-section
To derive the 10 profile points, it is necessary to have tabulated or graphical data to relate the
process value (PV) to the live liquid height. Figure F-3 on page 114 shows an example graph of
PV versus Liquid Height. In the example, 60% of the maximum height on the X-axis relates to a
Rectangular
Weir
V-notch
Weir
4–20 mA/HART
Mobrey MSP400RH
or MSP900GH
Maximum Height
Profile Height (P014)
Bottom Reference (P010)
Mobrey MCU900
Series Control Unit