Grundfos DMH 28X Installationsanleitung Seite 9

3.3.2 Accuracy
• Dosing flow fluctuation: smaller than ± 1 % within the control
range 10-100 %
• Linearity deviation: ± 1 % of the full scale value.
Applies to:
• water as dosing medium
• fully deaerated dosing head
• standard pump version.
3.3.3 Maximum inlet pressure
Pump model
DMH 280
DMH 281
DMH 283
DMH 285
DMH 286
DMH 287
DMH 288
3.3.4 Minimum counterpressure at the discharge valve of the
pump
Pump model
All
A positive pressure difference of at least 2 bar is
required between the suction valve and the
discharge valve in order for the dosing pump to
operate correctly. If the total counter-pressure (at the
Note
dosing point) and geodetic height difference between
the suction valve and the dosing point is less than 2
bar (20 m WC), a pressure-loading valve must be
installed immediately before the dosing point.
3.3.5 Maximum suction lift* (continuous operation) for media
with a viscosity similar to water
Pump model Pump type
DMH 280 All
DMH 281 All
DMH 283 All
DMH 285 All
DMH 85-50
DMH 111-50
DMH 286
DMH 170-50
DMH 222-50
DMH 287 All
DMH 288 All
* Applies to a filled dosing head.
[bar]
1
10
5
5
5
5
5
[bar]
2
Maximum suction lift
[m WC]
Flooded suction
1
1
1
1
1
Flooded suction
Flooded suction
1
1
3.3.6 Maximum suction lift (continuous operation) for media
with maximum permissible viscosity
Pump model
All
3.4 Sound pressure level
Pump model
DMH 280
DMH 281
DMH 283
DMH 285
DMH 286
DMH 287
DMH 288
* Testing according to DIN 45635-01-KL3.
3.5 Electrical data
3.5.1 Enclosure class
The enclosure class depends on the motor variant selected, see
motor nameplate.
The specified enclosure class can only be ensured if the power
supply cable is connected with the same degree of protection.
Pumps with electronics: The enclosure class is only met if the
sockets are protected! The data regarding the enclosure class
applies to pumps with correctly inserted plugs or screwed-on
caps.
3.5.2 Motor
Version: see motor and pump nameplates.
Maximum suction lift
[m WC]
Flooded suction
dB(A)*
55 ± 5
55 ± 5
65 ± 5
75 ± 5
75 ± 5
75 ± 5
65 ± 5
9