HNPM mzr-2921

Max Capacity: 18 ml/min

Max Pressure: 3 bar

Max Viscosity: 100 mPas

Temperature Range: -20 to +60 °C 

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HNPM mzr-2921 Low Pressure Micro Annular Gear Pump from HNP Mikrosysteme supplied by Thomson Process Equipment and Engineering Ltd. 

HNP Mikrosysteme compact micro annular gear pump HNPM mzr-2921 Low Pressure Pump for use in Analytical Instrumentation, Fuel Cells, In Vitro Diagnostics and Labratory Automation. 

HNP Mikrosysteme HNPM mzr-2921 is an innovative pump which generates a low pulsation, highly precise flow featuring low shear stress. It dispenses at a high precision the lowest volumes in microliter range.

Due to the compact design of the mzr 2921, small dimensions have been achieved. The pump is suitable for dosage of low viscosity liquids such as deionized water, watery solutions, methanol, solvents, oil and lubricants.


Advantages of the HNPM mzr-2921 Low Pressure Series Micro Annular Gear Pump

  • Compact dimensions -diameter 13 mm, length 75 mm
  • Small dosage volumes, high flow rates -smallest volume 0.5 µl – flow up to 18 ml/min
  • High dosage precision -precision CV 1 % at low volumes
  • Long service life -wear resistant tungsten carbide or ceramics
  • Low pulsation delivery, low shear stress -rotary micro annular gear technology

Applications of the HNPM mzr-2921 Low Pressure Series Micro Annular Gear Pump. 

  • Analytical instrumentation
  • Fuel cells
  • Laboratory automation
  • In vitro diagnostics


Flow rate

0.3 – 18 ml/min (min. 0.003 ml/min *)

Viscosity range

0.3 – 100 mPas (max. 1,000 mPas *)

Precision CV

1 % (Coefficient of Variation CV)

Velocity range

100 – 6000 rpm (min. 1 rpm *)

Fluid connection

slip fittings with outside diameter 2 mm optional: manifold assembly M2.1

Wetted parts

stainless steel 316L, ceramics, tungsten carbide Ni based, epoxy resin, optional: alloy C22 (2.4602) instead of stainless steel, ceramics instead of tungsten carbide; shaft seal: graphite-reinforced PTFE, stainless steel 316L, optional: alloy C276 (2.4819) instead of stainless steel; static seals: FPM, optional: EPDM, FFPM


DC-motor with graphite brushes, assigned power rating 3 W, nominal voltage 18 V, digital magnet encoder 16 counts per turn

Dimensions (L x W x H)

Ø 13 mm, length 75 mm


approx. 50 g (manifold assembly approx. 65 g)

Electrical connection

10-pole connector

Differential pressure range

0 – 3 bar

Maximum inlet pressure

1 bar

Operating temperature range

-20 … +60 °C

Displacement volume

3 µl

Smallest dosage volume

0.5 µl


* depending on accessories,
Customized solutions on request

Even if single parameters are within the indicated performance range of technical data, certain parameter combinations may not be achievable. Single parameters may exceed their indicated performance range under adequate circumstances. For detailed evaluation please contact Thomson Process Equipment and Engineering – the Irish Agent for HNP Mikrosysteme. Actual performance may vary.
Specifications are subject to change without notice.



HNPM mzr-2921 Low Pressure Pump Accessories

Reduction gear

reduction gear unit,

reduces pump speed,

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


Programmable controller S-ND

for micro annular gear pumps from the low pressure series and mzr-xx42,

programmable controller for continuous and discrete dosing


Controller S-KG

for micro annular gear pumps from the low pressure series and mzr-xx42,

4-Q-DC controller for continuous dosing


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