Dosing Curves - Grundfos DMX 221 Installation And Operating Instructions Manual

9.6 Dosing curves

The dosing curves are approximated curves showing the dependency between pump perform-
ance, counterpressure and stroke length. The stated values apply to the following conditions:
• Newtonian liquid
• density similar to that of water
• inlet line with foot valve
• flooded suction, 0.5 m
• zero point of pump for specified pressure
• standard pump version.
Abbreviation
Q
Q
0
Q [l/h]
h
h [%]
Hz
bar
Related information
• A.1. Curves
Description
Dosing flow
Zero point of the pump.
Dosing flow in litres per hour
Stroke length
Stroke length in percent of maximum stroke length
Frequency of the alternating current power supply in Hz = 1/s
Counterpressure at the pump outlet valve in bar
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