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Digital Dosing Pump
Digital Dosing Pump

Grundfos DMS dosing pumps are low cost diaphragm dosing pumps. The integral digital control unit allows a high turndown ratio to give great control flexibility without the vibration caused by the sharp pulsation in solenoid pumps.

The electronically controlled synchronous motor of the DMS offers almost the same advantages as those of the DME pumps. In a conventional diaphragm pump, the flow rate is adjusted by varying the stroke length. In Grundfos Digital Dosing pumps, the flow rate is adjusted by varying the stroke frequency. The operation of the pump offers several advantages:

  • The pump is always operating at full stroke length, irrespective of the capacity set, for optimum accuracy, priming and suction.
  • A turndown ratio of 1:100 for each pump size.
  • Reduction of pressure surges, preventing mechanical stress on diaphragm, tubes, connections and other dosing parts exposed to leakage and wear.
  • The installation is less affected by long suction and discharge lines.
  • Easier dosing of highly viscous and gas-containing liquids.
  • DMS A Version has analogue control of dosing rate.

Switching To Grundfos

Switching your existing LMI, Prominent, Alldos or Pulsafeeder dosing pump is simple and can bring several benefits. Click here for more...

Technical Specifications

Pump Type DMS 2DMS 4DMS 8DMS 12
Capacity at Max Pressure (l/hr) 2.547.512
Max Pressure (bar) 1175.43.4
Setting Range 1:100
Suction Lift (m) 6
Max Stroke Frequency (min-1) 180
Max Viscosity (mPa) 500
Power Supply (V) @ 50 Hz 230
Repeatability (%) ±1

Application Areas

  • Neutralisation chemicals
  • Disinfection chemicals
  • Coagulants
  • Flocculants
  • Corrosion inhibitors
  • Biocides
  • Detergents
  • Acid cleaners
  • Alkali cleaners
  • Zinc Phosphating chemicals
  • Chromating chemicals
  • Lubricants
  • pH adjustment chemicals
  • Oxygen scavengers

Wet End Materials

Component StandardAlternate 1Alternate 2
Diaphragm PTFE coated EPDM
Head Polypropylene PVDF Stainless Steel 1.4401
Ball Valve Ceramic Stainless Steel 1.4401 Glass

Any combination of the above materials is available.  Other materials are available on request.



A (mm) 137
B (mm) 239
C (mm) 36
D (mm) 168


Grundfos Databooklet pdf link

Grundfos data booklet
4.04MB pdf

Page reviewed: 18th December 2017