Micro annular gear pump mzr-11557 Ex

Ex-pump for application in chemical and process technology

The mzr-11557 Ex 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. Driven by a explosion-proof three-phase AC-motor the pump covers the flow range from 58 ml/min to 1152 ml/min. 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 ceramics 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.


  • Ex-certification ATEX
    conform with EU directive 94/9/EEC
  • High dosage precision
    precision CV < 1 % at low volumes
  • Long service life
    wear-resistant tungsten carbide
  • Broad viscosity range
    water, solvents, adhesives, grease, gel
  • Compact dimensions
    length 358 mm
  • High differential pressures
    achievable also for low viscosity liquids
  • Low pulsation delivery, low shear stress
    rotary micro annular gear technology
  • 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
Ambient temperature range -20 ... +40 °C (-55 ... +60 °C *)
Flow rate 58 – 1152 ml/min (29 - 576 ml/min *)
Viscosity range 0.3 – 1,000 mPas
Precision CV < 1 % (Coefficient of variation CV)
Velocity range 300 – 6000 rpm (150 – 3000 rpm *)
Fluid connection 3/8" NPT internal thread, lateral
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 partially stabilized ZrO2, optional: tungsten carbide Ni-based
Motor three-phase AC motor, IEC-Size 063, 2 poles, IP 55, rated voltage 240/400 V, frequency 50 Hz, 250 W
Dimensions (L x W x H) 344 x 120 x 227 mm
Weight approx. 25 kg
Temperature protection PTC-resistor, 6 pieces
Ex-certification CE II 2G c IIB T3
Place of installation Ex area zone 1, 2
Maximum system pressure 60 bar (870 psi) 200 bar * (2900 psi *)
(inlet pressure + differential pressure)
Differential pressure range 0 - 60 bar (870 psi)
Operating temperature range -5 ... +40 °C
Displacement volume 192 µl
Remark * 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 HNP Mikrosysteme. Actual performance may vary.
Specifications are subject to change without notice.

File Language Size
Manual mzr-11557 Ex
Manual mzr-11557 Ex (1.2 MB)
Betriebsanleitung mzr-11557 Ex (1.2 MB)
1.2 MB
Micro annular gear pump mzr-11557 Ex
Micro annular gear pump mzr-11557 Ex (295 KB)
Mikrozahnringpumpe mzr-11557 Ex (296 KB)
Micropompe gérotor mzr-11557 Ex (296 KB)
295 KB