Guide To Performance Curves; Curve Conditions - Grundfos ALPHA1 L Instrucciones De Instalación Y Funcionamiento

10.2 Guide to performance curves

Each pump setting has its own performance curve. See fig. 22.
H
Fig. 22 Performance curves in relation to pump setting
Settling Pump curve
I Constant curve or constant speed I
II Constant curve or constant speed II
III Constant curve or constant speed III
Proportional-pressure curve
Constant-pressure curve
For further information about pump settings, see sections
7. Control functions and 8. Setting the

10.3 Curve conditions

The guidelines below apply to the performance curves on the
following pages:
• Test liquid: airless water.
• The curves apply to a density of ρ = 998.2 kg/m
temperature of 20 °C.
• All curves show average values and must not be used as
guarantee curves. If a specific minimum performance is
required, individual measurements must be made.
• The curves for speeds I, II and III are marked.
• The curves apply to a kinematic viscosity of
(1.004 cSt).
• The conversion between head H [m] and differential pressure
ρ [kPa] has been made for water with a temperature of 60 °C,
3
ρ = 983.2 kg/m .
• Curves obtained according to EN 16297.
I
product.
3
and a liquid
 2
= 1.004 mm /s
III
II
Q
19