DMI

Summary

Product identification

• Product Line: Grundfos DMI Dosing Pumps
• Description: Simple and cost-efficient dosing pumps based on a well-proven synchronous-motor design, suitable for general or specific dosing purposes. Dosing heads and valves are available in different materials.
• Dosing Range: 0.3 to 18 l/h
• Pressure Range: Up to 16 bar
• Noise Level: 45 dB(A)
• Installation: Flexible, suitable for both horizontal and vertical installation. Control elements are top-mounted for horizontal installation.
• Control Variants:
  • DMI B: Designed for simple manual control, including stroke-length adjustment.
  • DMI A (AR): Offers more sophisticated control features, including internal frequency control, external contact-signal control (pulse control with multiplier/divisor), access to check functions and venting, and optional memory function. The DMI AR series also includes an alarm relay output.
• Applications:
  • Industrial and municipal water treatment
  • Water treatment in cooling towers
  • Industrial cleaning
  • Cleaning-In-Place (CIP) and disinfection (dairies, food and beverage industries, etc.)
  • Paper production/finishing
  • Chemical industry
  • Chemigation
  • Galvanic and surface treatment
  • Plating
  • Water treatment in swimming pools
  • Semiconductor industry

Operating limits

• Performance Range (50 Hz): Dosing capacities from 0.3 l/h at 10 bar to 18.0 l/h at 3.5 bar. Maximum stroke rate is 120 strokes/min for most models.
• Performance Range (60 Hz): Dosing capacities from 0.36 l/h at 10 bar to 21.6 l/h at 3 bar. Maximum stroke rate up to 232 strokes/min (DMI 0.8-16, DMI 1.1-16).
• Turn-down Ratio:
  • Pumps with stroke length adjustment: 10% to 100% of the maximum capacity.
  • Pumps with pulse control offer even more flexibility.
• Permissible Temperature Range of Pumped Media:
  • PVC Dosing Head: 0 to 40 °C (p < 10 bar), 0 to 20 °C (p < 16 bar)
  • Stainless Steel (DIN 1.4571) Dosing Head: –10 to 70 °C (p < 10 bar), –10 to 70 °C (p < 16 bar). Short-term resistance (15 minutes) to 120 °C at a counter pressure of maximum 2 bar.
  • PP Dosing Head: 0 to 40 °C (p < 10 bar)
  • PVDF Dosing Head: –10 to 60 °C (p < 10 bar), –10 to 20 °C (p < 16 bar). At 70 °C, the maximum counter pressure is 3 bar.
• Max. Suction Lift (Continuous Operation, liquids with a viscosity similar to water):
  • Standard: Up to 6 m (e.g., DMI 0.8-16 to DMI 18-4)
  • With Plus3 system: 1.5 m
• Max. Suction Lift (Start-up, non-degassing liquids with a viscosity similar to water):
  • Standard: Up to 2.8 m (e.g., DMI 6-8, DMI 9-6, DMI 14-4, DMI 18-4)
  • With Plus3 system: Special start-up device, consequently, the max. suction lift at start-up is not a problem.
• Max. Permissible Viscosity at Operating Temperature:
  • Standard: 100 to 200 mPa·s
  • With Plus3 system: 50 to 100 mPa·s
  • HV variant (with spring-loaded valves): 200 to 500 mPa·s
• Max. Inlet Pressure: 0.2 bar (Standard version). For Plus3 system, flooded suction only (pump must not be installed with inlet pressure, as this would cause overflow).
• Min. Required Counter Pressure: 1 bar (Standard and Plus3 system versions).
• Permissible Ambient Temperature: 0 to 40 °C
• Permissible Storage Temperature: –10 to 40 °C
• Max. Relative Humidity: 92% (non-condensing)

Feed water

• Pumped Media Compatibility: The datasheet provides a general guide on the resistance of materials (at room temperature) to various liquids. Factors such as purity, temperature, and abrasive particles may affect the chemical resistance of a specific material.
• Materials of Construction (Dosing Head, Gasket, Valve Ball):
  • Dosing Head: Polypropylene (PP), PVDF (polyvinylidene fluoride), PVC (polyvinyl chloride), Stainless steel (DIN 1.4401), PP with Plus3 (PP-P3), PVC with Plus3 (PVC-P3).
  • Gasket Material: EPDM, FKM, PTFE.
  • Valve Ball Material: Ceramic, Glass, PTFE, Stainless steel (DIN 1.4401).
• Examples of Compatible Media (at specified concentrations): Acetic acid, Aluminium chloride (AlCl₃), Aluminium sulphate (Al₂(SO₄)₃), Ammonia (NH₄OH), Calcium hydroxide (Ca(OH)₂), Calcium hypochlorite (Ca(OCl)₂), Chromic acid (H₂CrO₄), Copper sulphate (CuSO₄), Ferric chloride (FeCl₃), Ferric sulphate (Fe₂(SO₄)₃), Ferrous chloride (FeCl₂), Ferrous sulphate (FeSO₄), Hydrochloric acid (HCl), Hydrogen peroxide (H₂O₂), Nitric acid (HNO₃), Peracetic acid (CH₃COOOH), Potassium hydroxide (KOH), Potassium permanganate (KMnO₄), Sodium chlorate (NaClO₃), Sodium chloride (NaCl), Sodium chlorite (NaClO₂), Sodium hydroxide (NaOH), Sodium sulphide (Na₂S), Sodium sulphite (Na₂SO₃), Sulphurous acid (H₂SO₃), Sulphuric acid (H₂SO₄).
• Note: See the official PDF for exact tabulated values and specific resistance (resistant, limited resistance, not resistant) for each chemical, concentration, and material combination.

Product water

• Accuracy:
  • Dosing flow fluctuation: < ±1.5% of full scale value within the control range 10% to 100%.
  • Linearity deviation: ±4% of full scale value within the control range 20% to 100%.
  • Accuracy is based on water as the dosing liquid, a fully deaerated dosing head, and a standard pump version.

Electrical

• Supply Voltage:
  • 115 V ±10%, 50/60 Hz
  • 230 V ±10%, 50/60 Hz
• Motor: Overload-protected synchronous motor with gear reduction.
• Maximum Power Consumption: 11 W or 22 W (depending on pump model).
• Maximum Current Consumption:
  • At 115 V: 0.096 A or 0.192 A
  • At 230 V: 0.048 A or 0.096 A
• Enclosure Class: IP 65
• Mains Plug Options: EU (Schuko), USA/Canada, Australia/New Zealand/Taiwan, Switzerland, or without plug.

Mechanical / hydraulic

• Dimensions (Standard DMI):
  • A: 225 mm (for DMI 0.3-10 to DMI 6-8), 230 mm (for DMI 9-6 to DMI 18-4)
  • B: 20.7 mm (for DMI 0.3-10 to DMI 6-8), 26.7 mm (for DMI 9-6 to DMI 18-4)
  • C: 175.5 mm (for DMI 0.3-10 to DMI 6-8), 184.5 mm (for DMI 9-6 to DMI 18-4)
  • D: 112 mm (for DMI 0.3-10 to DMI 6-8), 133 mm (for DMI 9-6 to DMI 18-4)
  • E: G 3/8
  • See the official PDF for exact tabulated values for HV (high-viscosity) versions, as dimensions may change.
• Dimensions (DMI with Plus3 System):
  • A1: 261 mm
  • B1: 25.2 mm
  • C1: 251 mm
  • D1: 197.5 mm
  • E1: G 3/8
  • Note: Not all DMI models are available with the Plus3 system. See the official PDF for specific model availability.
• Weight (Standard Version): 2.9 kg
• Connections (Suction/Discharge):
  • Pipe: 4/6 mm
  • Tube: 4/6 mm, 5/8 mm, 6/9 mm, 9/12 mm, 1/8" / 1/4", 1/4" / 3/8", 3/8" / 1/2", 6/12 mm (with cementing d. 12 mm)
  • Threaded: Rp 1/4 (female), 1/4" NPT (female), 1/2" NPT (male)
  • Welding diameter: 16 mm
• Valve Types:
  • Standard
  • Spring-loaded (0.05 bar suction opening pressure; 0.05 bar discharge opening pressure)
  • Spring-loaded (0.05 bar suction opening pressure; 0.8 bar discharge opening pressure)
  • Spring-loaded, discharge only (0.8 bar opening pressure)
• Special Features:
  • Plus3 System: Incorporates priming/deaeration and calibration system for moderately volatile liquids (e.g., chlorine bleaching agents). Features a double-diaphragm system for high process accuracy and cost-efficient operation. The priming chamber allows for suction lift configuration and exchange of chemical tanks without interrupting discharge.
  • Spring-loaded Valves: Available as an option for improved performance when handling viscous liquids.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

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