12
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: 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.
7. Transport and storage
7.1 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.
7.2 Unpacking
Retain the packaging for future storage or return, or dispose of
the packaging in accordance with local regulations.
7.3 Intermediate storage
• Permissible storage temperature: –20 °C to +50 °C.
• Permissible air humidity: max. relative humidity:
70 % at +40 °C, 90 % at +35 °C.
7.4 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 Alldos 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 Alldos 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 Alldos 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
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
[°C] [°C] [°C]
PVC 0 40 20
Stainless steel,
DIN 1.4571*
–10 100 100
Stainless steel,
DIN 2.4610*
–10 100 100
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 Alldos 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 Alldos
service workshop.
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