For mini plant and microreaction technology

The mzr-7255 micro annular gear pump of the hermetic and chemically inert series is, considering its almost universal suitability for aggressive and corrosive media, a revolution in the pump technology. Its rotors and functional elements being made of ceramics, the pump shows the highest chemical resistance and an outstanding resistance to wear. Thanks to the use of SSiC (pressureless sintered silicon carbide) as bearing and shaft material, a magnetic coupling, and case components made out of alloy C22 (DIN 2.4602), this pump will take up any challenge in the chemical industry applications.


  • High resistance to corrosion
    oxidizing and reducing media, acids and bases
  • Long service life
    wear-resistant ceramic components
  • Hermetically sealed
    magnetic coupling (NdFeB)
  • Compact, chemically inert pump head
    146 mm long, alloy C22, SSiC, Al2O3 and ZrO2-ceramics
  • Precision motor and user-friendly control
    dynamic DC-servomotor with encoder and microcontroller,
  • RS-232 or CAN-Bus, analog, I/O
  • Precise dosage, low pulsation
    rotary micro annular gear technology, no valves


  • Mini plant technology
  • Microreaction technology

Flow charts

Technical data

  • Flow rate
    0.048 - 288 ml/min
  • Smallest dosage volume
    30 µl
  • Displacement volume
    48 µl
  • Maximum system pressure
    80 bar (1160 psi) (inlet pressure + differential pressure)
  • Differential pressure range
    0 – 40 bar
  • Liquid temperature range
    -5 ... +60 °C (-20 ... +200 °C *)
  • Viscosity range
    0.3 - 1000 mPas
  • Precision CV
    < 1% (Coefficient of variation CV)
  • Velocity range
    1 - 6000 rpm
  • Fluid connection
    1/8" NPT internal thread, lateral optional: 1/8" NPT internal thread, frontal
  • Wetted parts
    Pump case alloy C22 (2.4602), optional: stainless steel 316L;
    seals FFKM (Kalrez® Spectrum™ 6375), optional: FPM, EPDM;
    shaft/bearing sintered silicon carbide (SSiC);
    bearing and wetted functional parts Al2O3 ceramics;
    rotors TAZ composite ceramics, optional: tungsten carbide Ni-based
  • Coupling
    8-pole NdFeB magnetic coupling
  • Motor
    DC-servomotor, 24 V DC, 44 W, with microcontroller
  • Interface
    0–10 V, 0 (4) –20 mA, RS-232, 1 digital input/output, optional: CAN-Bus
  • Dimensions (L x W x H)
    146 x 70 x 72 mm
  • Weight
    approx. 1650 g
  • Remarks
    * with optional heat insulation module, 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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