Siemens SITRANS L 7ML5400 Operating Instructions Manual page 304

Technical reference
A.5 Volume Calculation
2.6.1.Vessel Shape set to Universal, Linear
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 one or more arcs), enter numerous
breakpoints along the arc, for best volume calculation accuracy.
2.6.1.Vessel Shape set to Universal, Curved
This calculation creates a cubic spline approximation of the level/volume curve, providing
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:
• two breakpoints very near the minimum level
• one breakpoint at the tangent points of each arc
• one breakpoint at each arc apex
• two breakpoints very near the maximum level
For combination curves, enter at least two breakpoints immediately before and after any
sharp angle (as well as one breakpoint exactly at the angle) on the curve.
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Operating Instructions, 04/2021, A5E33329501-AG
SITRANS LUT400