HNPM mzr-7255

  • Max. Capacity 288 ml/min

  • Max. Pressure 40 bar

  • Max. Viscosity 1000 mPas

  • Temperature Range -20 to +100 °C 

HNPM mzr-7255

Hermetic Inert Series Pump mzr-7255 micro annular gear pump suitable for aggressive and corrosive fluids from HNP Mikrosysteme.

The HNP MIkrosysteme micro annular gear pump mzr-7255 is leak Free, has a long Service life and is low on energy consumption with outstanding resistance to corrosion and wear. 

The HNP (HNPM) Mikrosysteme  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.


Advantages of the HNP Mikrosysteme HNPM mzr-7255 micro annular gear pump with compact chemically inert pump head.

  • 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


Applications of the HNPM mzr-7255 Hermetically sealed ceramic rotor pump: 

  • Mini plant technology
  • Microreaction technology
  • Accessories
  • Heat insulation module
  • Electrical heating module


Technical Data for the HNPM Mikrosysteme MZR-7255 Micro Annular Gear Pump

Flow rate 0.048 – 288 ml/min
Viscosity range 0.3 – 1,000 mPas
Precision CV < 1 % (Coefficient of variation CV)
Velocity range 1 – 6000 rpm
Fluid connection 1/8" 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 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
Maximum system pressure 80 bar (1160 psi) (inlet pressure + differential pressure)
Torque transfer 8-pole NdFeB magnetic coupling
Differential pressure range 0 – 40 bar (580 psi)
Operating temperature range -5 … +60 °C (-20 … +200 °C *)
Displacement volume 48 µl
Smallest dosage volume 30 µl
Remark * with optional heat insulation module,
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.