Universal Linear - Siemens HydroRanger 200 HMI Operating Instructions Manual

If the PMD (primary measuring device) does not match any of the eight preset PMD
calculations, or if a PMD is not used, select a Universal Volume calculation. Use the head/
flow graph or chart provided by the PMD fabricator (or create one based on the PMD or
channel dimensions).
Based on the graph, choose the Universal Flow calculation, and select the head versus
flow breakpoints to be entered (maximum of 32). Generally, the more breakpoints entered,
the greater the flow calculation accuracy.

Universal Linear

2. 1 3.2. Primary Measuring Device
Set = Universal Linear Flow Calculation.
This flow calculation creates a piece-wise linear approximation of the head/flow curve.
This option provides best results if the curve has sharp angles joining relatively linear
sections.
Enter a Head Breakpoint at each point where the head/flow curve bends sharply
(minimum of two). For combination curves (mostly linear but include one or more arcs),
enter numerous breakpoints along the arc, for best flow calculation accuracy.
Typical flow characterization
See also on page 107.
Universal Curved
This calculation creates a cubic spline approximation of the head/flow 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:
A5E36281317 HydroRanger 200 HMI – OPERATING INSTRUCTIONS Page 245