Fluid-dependent customizable dosing pump

The micro annular gear pump mzr-7243 of the modular pump series is suitable for dosing and metering in low to medium pressure and viscosity ranges. To the main assets of this series belong low pulsation, high precision low volume dosage of non-lubricating liquids, compact design with smallest dimensions and low price. These pumps are suitable for dosing and dispensing deionized water, aqueous solutions, solvents as well as low to highly viscous oils, lubricants or dyes 


  • Customized material selection
    pump components in stainless steel/tungsten carbide, aluminium/tungsten carbide or alloy C22/ceramics
  • High dosage precision
    precision CV 1 % at low volumes
  • Dynamic powerful small drive
    stepper motor, high torque
  • Long service life
    wear- and corrosion-resistant materials
  • Low pulsation delivery, low shear stress
    rotary micro annular gear technology


  • Chemical processing
  • Industrial and plant engineering
  • Packaging
  • Dispensing of adhesives

Flow charts

Technical data

  • Flow rate
    0.048 - 28.8 ml/min
  • Smallest dosage volume
    30 µl
  • Displacement volume
    48 µl
  • Differential pressure range
    0 - 5 bar (73 psi), max. 40 bar * (max. 580 psi *)
  • Maximum inlet pressure
    1 bar (15 psi), max. 5 bar * (max. 73 psi *)
  • Liquid temperature range
    -20 ... +60 °C (-4 ... +140 °F)
  • Viscosity range
    0.3 - 10,000 (0.3 - 50,000*) mPas
  • Precision CV
    1 % (Coefficient of variation CV)
  • Velocity range
    1 - 600 rpm
  • Fluid connection
    1/8" NPT internal thread, lateral; optional: flanged connection with pipe socket, frontal
  • Wetted parts
    Pump case: stainless steel 316L, optional: aluminium anodized, alloy C22; rotors: tungsten carbide Ni-based, optional: ceramics; bearing: ceramics, epoxy resin; shaft seal: graphite-reinforced PTFE, stainless steel 316L; static seals: FPM, optional: EPDM, FFPM
  • Motor
    stepper motor NEMA 17 standard
  • Dimensions (L x W x H)
    approx. 128 x 42 x 60 mm
  • Weight
    approx. 815 g (aluminium version approx. 560 g)
  • Remarks
    * with optional additional axial bearing support; 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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