English (GB)
9
1.3.4 Accuracy
•
Applies to:
– water as dosing medium
– fully deaerated dosing head
– standard pump version.
•
Dosing flow fluctuation and linearity deviation:
± 1.5 % of the full-scale value.
•
Construction tolerance: according to
VDMA 24284.
1.3.5 Inlet pressure and counter-pressure /
suction lift during operation
Maximum inlet pressure
* For pumps with pressure sensor (Flow Monitor
pump option), the inlet pressure on the suction side
must not exceed 1 bar.
Minimum counter-pressure at the pump
discharge valve
* For pumps with pressure sensor (Flow Monitor
pump option), the minimum system pressure is
2 bar and the minimum pressure difference
between the suction and discharge sides is 2 bar.
If the volume flow is not constant (as, for example,
in the case of contact or analog control), even
small volume flows should not fall below the
minimum pressure or the minimum pressure
difference.
Maximum suction lift* (start-up) for media with a
viscosity similar to water
* Deaeration valve open.
** Pumps with Plus
3
system are delivered with a
special start-up device.
Pump type
Operating conditions / version*
No
rmal
o
p
eration
Slow-mo
d
e o
p
eration
With
Plu
s
3
syste
m
[bar]
[bar]
[bar]
DDI 0.4-10 -
DDI 5.5-10
2
2
No flooded
suction, no
positive inlet
pressure!
DDI 13.8-4
2
2
—
DDI 20-3
1.5
1.5
—
Pump type
Operating conditions / version*
All*
[bar]
DDI 0.4-10 -
DDI 20-3
1
Pump type
Operating conditions / version
Continuous
operation
Continuous
operation with
Plus
3
system
[m]
[m]
DDI 0.4-10
Flooded suction
**
DDI 2.2-16
1.5
**
DDI 2.5-10
1.5
**
DDI 5.5-10
2.0
**
DDI 13.8-4
2.8
—
DDI 20-3
2.8
—
