VOLUME CALCULATION
The XPL+ provides a variety of volume calculation features ( P050 to P055 ).
If the vessel to be monitored does not match any of the 8 preset Tank Shape calculations, a Universal
Volume calculation may be used. Use the level/volume graph or chart provided by the vessel fabricator
( or create one based on the vessel dimensions ).
From this graph, determine which Universal Volume calculation will provide the best results, and select the
level vs volume breakpoints to be entered ( 32 max. ). Generally, the more breakpoints entered, the greater
the volume calculation accuracy.
Universal, Linear ( P050 = 9 )
This volume calculation creates a piece-wise linear approximation of the level / volume curve. This option
provides best results if the curve has sharp angles joining relatively linear sections.
Enter a Level Breakpoint at each point where the level/volume curve bends sharply ( 2 minimum ).
For combination curves ( mostly linear but include 1 or more arcs ), ensure numerous breakpoints are
entered along the arc, for best volume calculation accuracy.
Universal, Curved ( P050 = 10 )
This volume calculation creates a cubic spline approximation of the level/volume curve. This option provides
best results if the curve is non-linear, and there are no sharp angles.
Select at least enough breakpoints from the curve to satisfy the following:
» 2 breakpoints very near the minimum level
» 1 breakpoint at the tangent points of each arc
» 1 breakpoint at each arc apex
» 2 breakpoints very near the maximum level
For combination curves, ensure at least 2 breakpoints are entered immediately before and after any sharp
angle ( as well as 1 breakpoint exactly at the angle ) on the curve.
volume
level
volume
level
TECHNICAL REFERENCE
PL-532 85
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