Ex-pumps for application in chemical and process technology

The micro annular gear pump mzr-4609 Ex covers the flow range 0.012 - 56 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 dimensions are unique features of this pump series. The 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.


  • Ex-certification ATEX
    conform with EU Directive 2014/34/EU
  • High dosage precision
    precision CV < 1 % at low volumes
  • Compact dimensions
    length < 295 mm, including Ex-motor
  • Broad viscosity range
    methanol, solvents, adhesives, grease, gel
  • Long service life
    wear-resistant tungsten carbide
  • Low pulsation delivery, low shear stress
    rotary micro annular gear technology

Technical data

  • Flow rate
    0.012 - 56 ml/min
  • Smallest dosage volume
    2 µl
  • Displacement volume
    12 µl
  • Differential pressure range
    0 – 10 bar (145 psi)
  • Maximum inlet pressure
    5 bar (73 psi), (10 bar (145) *)
  • Ambient temperature range
    0 ... +40 (+104 °F) °C
  • Liquid temperature range
    -5 ... +40 °C (+23 ... +104°F)
  • Viscosity range
    0.3 - 5,000 mPas
  • Precision CV
    < 1 % (Coefficient of variation CV)
  • Ex-certification
    CE Ex II 2G Ex h IIC T4 Gb
  • Place of installation
    Ex-area zone 1, 2
  • Wetted parts
    stainless steel 316L (1.4404, 1.4435), Ni-based tungsten carbide; shaft seal: graphite-reinforced PTFE, 316L; static seals: FPM, optional: EPDM, FFPM
  • Motor
    DC-motor, 24 V DC, 2 A, 53 W, encoder: 500 counts per turn, type HEDL 5540
  • Velocity range
    1 - 4,700 rpm
  • Cable length
    10 m
  • Weight
    approx. 2,500 g
  • Remarks
    * with optional fluidic seal 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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