Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
F-6
P011 (Tank Shape) P011 Description
This selects the shape of a vessel or open channel, and establishes the linear
or non-linear relationship between the live liquid level (height) and the
Process Value (PV) derived from that level.
The display (reported) units of measurement for the output PV are set using
P012. Changing the units does not automatically re-scale the output PV
value.
There are over 30 shape options available to select, including:
• “P011 = “Linear”” on page F-6
• “P011 = “Special”” on page F-6
• “P011 = “Horizontal Cyl Flat” (Horizontal cylinder, flat ends)” on page F-9
• “P011 = “Spherical”” on page F-9
• “P011 = “Flume/Weir-3/2”” on page F-10
• “P011 = “V-Notch-5/2”” on page F-11
P011 = “Linear”
This setting is applicable when requiring level or content measurements
involving a vessel with a constant cross-section. By selecting “Linear”, the
level or content is a product (multiplication) of the liquid height above the zero
level and a scaling factor (P013). If volume is not required, the scaling factor
is set to 1.0 unless other units for the PV are required.
The volume of the contents can be shown by entering the volume per meter of
height factor in to P013. If the liquid level is being measured in units of feet or
inches, P013 will specify the volume per feet or volume per inch.
P011 = “Special”
By selecting “Special”, parameters P030 to P039 can be edited to plot the
unique profile of an irregular shaped vessel or open channel (see Figure F-2).
Figure F-1.
Flow over a 2-stage weir
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