English (GB)
11
3.10 Dosing medium
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.
* The stated values are approximate values and apply to the
standard pumps.
Permissible media temperature
* 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.
4. Transport and storage
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 conditions
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.
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 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.
Note
In the event of questions regarding the material
resistance and suitability of the pump for specific
dosing media, please contact Grundfos.
Note
Note that the viscosity increases with decreasing
temperature!
Pump type
Up to stroke
rate 63
[n/min]
Stroke rate
64-120
[n/min]
From stroke
rate 121
[n/min]
Maximum viscosity* [mPa s]
DMH 251
300
100
50
DMH 252
300
100
50
DMH 253
300
100
10
DMH 254
300
100
5
DMH 255
200
100
5
DMH 257
200
50
5
Dosing head
material
Min. media
temperature
Max. media temperature
p <
10 bar
p <
16 bar
p <
25 bar
[°C]
[°C]
[°C]
[°C]
PVC
0
40
20
-
Stainless steel,
DIN 1.4571*
-10
90
90
90
Stainless steel,
DIN 2.4610*
-10
90
90
90
PP
0
40
20
-
PVDF**
-10
60
20
-
Warning
Observe the chemical manufacturer's safety
instructions when handling chemicals!
Caution
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
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!
Caution
Do not throw or drop the pump.
Do not use the protective packaging as transport
packaging.
Caution
Grundfos accepts no liability for damage caused by
incorrect transportation, missing or unsuitable
packaging of the pump, residual media or leaking oil!
Caution
If a pump has been used for a medium which is
injurious to health or toxic, the pump will be classified
as contaminated.
Caution
The replacement of the power supply cable must be
carried out by an authorised Grundfos service
workshop.
