HNPM mzr-2505

Max Capacity: 0.0015 – 9 ml/min (min. 10 µl/h *)

Max Pressure: 15 bar

Max Viscosity: 25,000 mPas

Temperature Range: -5 to +60 °C

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HNPM mzr-2505

Micro annular gear pumps are miniaturized rotary positive displacement pumps. They are based on a so-called micro annular gear principle with an externally toothed internal rotor and an internally toothed external rotor. The internal rotor has one tooth less than the external rotor, with tooth ratios of 6/7 and 10/11. The manufacturing tolerances of the rotors are in the range of few micrometers.
The micro annular gear pump mzr-2505 covers the flow rate range 0.0015-9 ml/min. The main features high precision, low pulsation, low volume dosage even of non-lubricating liquids or at high pressures, compact design and an integrated microcontroller. The pump allows dosage in a broad viscosity range and shows small, compact dimensions. The mzr-2505 targets applications in industrial production and process technology. The pump has been designed for continuous delivery and discrete dosage of water, aqueous solutions, solvents, methanol, oil, lubricants, adhesives, inks and paints as well as other high viscosity liquids.

Advantages of the MZR – 2505 Micro Annular Pump 

  • High dosage precision
  • precision CV < 1 % at low volumes
  • High differential pressures
  • achievable also for low viscosity liquids
  • Compact dimensions
  • length 140 mm, including controller
  • Broad viscosity range
  • methanol, water, solvents, adhesives, grease, gel
  • Low pulsation delivery, low shear stress
  • rotary micro annular gear technology
  • Long service life
  • wear-resistant tungsten carbide
  • Precision motor and sophisticated control
  • DC-servomotor with integrated microcontroller


  • Chemical processing
  • Industrial and plant engineering
  • Packaging
  • Medical and pharmaceutical industry
  • Mini plant technology
  • Spray technology
  • Dispensing of adhesives
  • Ink and paint dosage
  • Vacuum applications



Flow rate 0.0015 – 9 ml/min (min. 10 µl/h *)
Viscosity range 0.3 – 25,000 mPas
Precision CV < 1 % (Coefficient of variation CV)
Velocity range 1 – 6000 rpm
Fluid connection 1/4"–28 UNF, frontal
Wetted parts stainless steel 316L (1.4404, 1.4435), tungsten carbide Ni-based; shaft seal: graphite-reinforced PTFE, 316L static seals: FPM, optional: EPDM, FFPM
Motor DC-servomotor 24 V DC, 44 W
Controller integrated 16-bit microcontroller
Dimensions (L x W x H) 140 x 45 x 65 mm
Weight approx. 780 g
Differential pressure range 0 – 2.5 bar (water, 1 mPas); 0 – 15 bar (oil, 16 mPas)
Maximum inlet pressure 5 bar (73 psi), (10 – 40 bar (580 psi) *)
Operating temperature range -5 … +60 °C (-20 … +150 °C *)
Displacement volume 1.5 µl
Smallest dosage volume 0.25 µl
Remark * depending on accessories,

Customized solutions on request



Available Accessories


Reduction gear

reduction gear unit,

reduces pump speed,

stabilizes motor speed in low RPM-range, increases drive torque

Heat insulation module

thermal insulation of pump head and drive for high performance and hermetic inert pump series, 

also available in ATEX

Fluidic seal module

additional sealing system for handling liquids sensitive to air or moisture and for vacuum applications of pumps from the high performance series

Electrical heating module

additional electrical heating for pump heads from the high performance and hermetic inert series with frontal fluid connection,

thermal insulation of pump head and drive,

prevents temperature drop of liquid

Double shell heating module

double shell for active heating or cooling of pump heads from the high performance and hermetic inert series,

thermal insulation of pump head and drive,

prevents temperature drop of liquid


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