Dosing Medium - Grundfos DMX 221 Installations- Und Bedienungsanleitung

9.2 Dosing medium

Dosing medium characteristics
The dosing medium must have the following basic characteristics:
• liquid
• non-flammable.
For pumps with integral relief valve, the dosing medium must have the following characteristics in
addition:
• non-crystallizing.
Make sure the dosing medium is not freezing or boiling at operation conditions.
In case of questions regarding the material resistance and suitability of the pump for a specific
dosing medium, contact Grundfos.
Medium temperature for pumps with PVC dosing head
Maximum counterpressure
Up to 12 bar
Up to 16 bar
Medium temperature for pumps with stainless-steel dosing head
Maximum counterpressure
Up to 16 bar
For SIP or CIP applications (up to 2 bar, maximum 15 minutes)
Medium temperature for pumps with PP dosing head
Maximum counterpressure
Up to 10 bar
Medium temperature for pumps with PVDF dosing head
Maximum counterpressure
Up to 9 bar
Up to 10 bar
Up to 16 bar
Maximum viscosity
The values apply to dosing media with the following characteristics:
• Newtonian liquid
• non-degassing and non-abrasive liquid.
Parameter
Maximum viscosity
Related information
• 9.3.4 Suction lift
• https://en.wikipedia.org/wiki/Newtonian_fluid
Value
100-400 mPa s (depending on the pump type)
Medium temperature
0-40 °C
0-20 °C
Medium temperature
-10 to +70 °C
up to 145 °C
Medium temperature
0-40 °C
Medium temperature
-10 to +70 °C
-10 to +60 °C
-10 to +20 °C
DMX 221 | | 38