Dosing pump for analytical instrumentation

The compact micro annular gear pump mzr-2521 of the low pressure series is an innovative pump concept for use in analytical instrumentation. The pump 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 its compact design 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.


  • Compact dimensions
    diameter 13 mm, length 75 mm
  • Small dosage volumes, high flow rates
    smallest volume 0.25 µl, flow up to 9 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


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

Flow charts

Technical data

  • Flow rate
    0.15 – 9 (min. 0.0015 *) ml/min
  • Smallest dosage volume
    0.25 µl
  • Displacement volume
    1.5 µl
  • Differential pressure range
    0 - 1.5 bar (22 psi)
  • Maximum inlet pressure
    1 bar (15 psi)
  • Liquid temperature range
    -20 ... +60 °C (-4 ... +140 °F)
  • Viscosity range
    0.3 – 100 (max. 1,000 *) mPas
  • Precision CV
    1 % (Coefficient of variation CV)
  • Velocity range
    100 – 6,000 (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
  • Motor
    DC-motor with graphite brushes, assigned power rating 3 W, nominal voltage 18 V, digital magnet encoder 16 counts per turn
  • Electrical connection
    10-pole connector
  • Dimensions (L x W x H)
    Ø 13 mm, length 75 mm
  • Weight
    approx. 50 g (manifold assembly approx. 65 g)
  • Remarks
    * depending on accessories, Customized solutions on request
  • Notice
    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 HNP Mikrosysteme. Actual performance may vary. Specifications are subject to change without notice. 
    This document is subject to change without notice.

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