Dosing Medium; Transport And Storage; Delivery; Unpacking - Grundfos DMH 25 Série Notice D'installation Et De Fonctionnement

3.10 Dosing medium

In the event of questions regarding the material
Note resistance and suitability of the pump for specific
dosing media, please contact Grundfos.
The dosing medium must have the following basic characteristics
for the standard pumps:
• liquid
• non-abrasive
The dosing of abrasive media is possible with certain versions,
on request.
• non-inflammable
The dosing of inflammable media is possible with certain
versions of explosion-proof pumps, in accordance with ATEX.
Maximum permissible viscosity at operating temperature*
Applies to:
• Newtonian liquids
• non-degassing media
• media without suspended matter
• media with a density similar to water.
Note that the viscosity increases with decreasing
Note
temperature!
Up to stroke
rate 63
Pump type
[n/min]
Maximum viscosity* [mPa s]
DMH 251 300
DMH 252 300
DMH 253 300
DMH 254 300
DMH 255 200
DMH 257 200
* The stated values are approximate values and apply to the
standard pumps.
Permissible media temperature
Min. media
Dosing head
temperature
material
[°C]
PVC 0
Stainless steel,
-10
DIN 1.4571*
Stainless steel,
-10
DIN 2.4610*
PP 0
PVDF** -10
* For SIP/CIP applications (not with ATEX): A temperature of
145 °C at a counter-pressure of max. 2 bar is permitted for a
short period (15 minutes).
** At 70 °C, the maximum counter-pressure is 9 bar.
Warning
Observe the chemical manufacturer's safety
instructions when handling chemicals!
Stroke rate From stroke
rate 121
64-120
[n/min] [n/min]
100 50
100 50
100 10
100 5
100 5
50 5
Max. media temperature
p < p < p <
10 bar 16 bar 25 bar
[°C] [°C] [°C]
40 20 -
90 90 90
90 90 90
40 20 -
60 20 -
The dosing medium must be in liquid form!
Observe the freezing and boiling points of the dosing
medium!
The resistance of the parts that come into contact
with the media depends on the media, media
Caution
temperature and operating pressure. Ensure that
parts in contact with the media are chemically
resistant to the dosing medium under operating
conditions!
Make sure that the pump is suitable for the actual
dosing medium!

4. Transport and storage

Do not throw or drop the pump.
Caution
Do not use the protective packaging as transport
packaging.

4.1 Delivery

The DMH 25X dosing pumps are supplied in different packaging,
depending on pump type and the overall delivery. For transport
and intermediate storage, use the correct packaging to protect
the pump against damage.

4.2 Unpacking

Retain the packaging for future storage or return, or dispose of
the packaging in accordance with local regulations.

4.3 Intermediate storage

See section 3.9 Ambient and operating

4.4 Return

The pump must be thoroughly cleaned before it is returned or
stored. It is essential that there are no traces of toxic or
hazardous media remaining on the pump. Drain the oil from the
drive mechanism and package the pump correctly.
Grundfos accepts no liability for damage caused by
Caution
incorrect transportation, missing or unsuitable
packaging of the pump, residual media or leaking oil!
Before returning the pump to Grundfos Water Treatment for
service, the safety declaration at the end of these instructions
must be filled in by authorised personnel and attached to the
pump in a visible position.
If a pump has been used for a medium which is
Caution
injurious to health or toxic, the pump will be classified
as contaminated.
If Grundfos Water Treatment is requested to service the pump, it
must be ensured that the pump is free from substances that can
be injurious to health or toxic. If the pump has been used for such
substances, the pump must be cleaned before it is returned.
If proper cleaning is not possible, all relevant information about
the chemical must be provided.
If the above is not fulfilled, Grundfos Water Treatment can refuse
to accept the pump for service. Possible costs of returning the
pump are paid by the customer.
The safety declaration can be found at the end of these
instructions.
The replacement of the power supply cable must be
Caution
carried out by an authorised Grundfos service
workshop.
conditions.
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