68 Program features
Flow calculation
The flow calculation function provides a reasonably accurate (typically ±3…6%)
calculation of the flow without the installation of a separate flow meter. The flow is
calculated on the basis of parameter data such as pump inlet and outlet diameters,
pressure at pump inlet and outlet, height difference of pressure sensors, and pump
characteristics.
The user can either define a PQ (power/flow) or HQ (head/flow) performance curve
that is used as the basis for the calculation. It is also possible to use differential
pressure based flow feedback.
The figure below shows the HQ performance curve of the pump for the flow
calculation function.
The figure below shows the PQ performance curve of the pump for the flow
calculation function.
H [m] or H [ft]
Q [m
3
/h] or Q [gpm]
4
2
1
3
5
P [kW] or P [hp]
Q [m
3
/h] or Q [gpm]
2
4
5
3
1
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