HNPM mzr-6359 Ex

Max Capacity: 112 ml/min

Max Pressure: 40 bar

Max Viscosity: 100 mPas

Temperature Range: -20 to +100 °C 

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Explosion Proof, Atex Area, Micro Annular Gear Pump HNPM mzr-6359 Ex is Hermetic Inert Pump by HNP Mikrosysteme for use in chemical and process technology at Thomson Process Equipment and Engineering.

HNPM Atex Pump Ex Series HNPM mzr-6359 Ex Micro Annular Gear Pump offers Precision Dosing, Low Pulsation Small Volume Dosage at High Pressure for broad viscosity range of liquids including watery solutions, solvents, oil and gels. For pumping even corrosive and aggressive liquids. 

HNP Mikrosysteme micro annular gear pump HNPM mzr-6359 Ex covers the flow range 0.048 – 225 ml/min. The highly precise, low pulsation small volume dosage even of non-lubricating liquids or at high pressure, the compact design of this Ex-pump, the broad viscosity range and the small measurements are unique features of this pump series. 

The HNP Mikrosysteme HNPM mzr-6359 Ex pumps are applied in the field of chemical and process technology and are suitable for both continuous delivery and discrete dosage of watery solutions, solvents, oil and other viscous liquids. Accessories extending the operating parameters of the device are available.Thanks to the use of rotors and functional elements being made of ceramics, a magnetic coupling, and case components made out of alloy C22, this pump will take up any challenge in the chemical industry applications.

Advantages of the HNPM mzr-6359 Ex

  • Ex-certification ATEX – conform with EU Directive 2014/34/EU
  • Compact, chemically inert – length 280 mm, alloy C22, SSiC, Al2O3 and ZrO2-ceramics
  • Long service life – wear-resistant ceramic components
  • Hermetically sealed – magnetic coupling (NdFeB)
  • High dosage precision – precision CV < 1 % at low volumes
  • Low pulsation delivery, low shear stress – rotary micro annular gear technology, no valves


Ambient temperature range

0 … +40 °C

Flow rate

0.024 – 112 ml/min

Viscosity range

0.3 – 100 mPas

Precision CV

< 1 % (Coefficient of variation CV)

Velocity range

1 – 4700 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


DC-motor, 24 V DC, 2 A, 53 W, encoder: 500 counts per turn, type HEDL 5540

Cable length

10 m


approx. 4900 g



Place of installation

Ex area zone 1, 2

Maximum system pressure

80 bar (1160 psi) (inlet pressure + differential pressure)

Differential pressure range

0 – 15 bar (1 mPas), 0 – 40 bar (above 16 mPas)

Operating temperature range

-5 … +60 °C (-20 … +120 °C *)

Displacement volume

24 µl

Smallest dosage volume

15 µl


* 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's Irish agent, Thomson Process Equipment and Engineering Ltd. Actual performance may vary.
Specifications are subject to change without notice.



Accessories for the ATEX Micro Annular Gear Pump from HNP Mikrosysteme HNPM mzr-6359 Ex

for micro annular gear pumps mzr-xx09 Ex and mzr-xx59 Ex,

programmable controller for continuous and discrete dosing


Heat insulation module

thermal insulation of pump head and drive for high performance and hermetic inert pump series, 

also available in ATEX


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