Micro annular gear pump mzr-2521

Dosing pump for analytical instrumentation

The compact micro annular gear pump mzr-2521 of the low pressure series is an innovative pump concept for use in analytical instrumentation. The pump generates a low pulsation, highly precise flow featuring low shear stress. It dispenses at a high precision the lowest volumes in microliter range. Due to its compact design small dimensions have been achieved. The pump is suitable for dosage of low viscosity liquids such as deionized water, watery solutions, methanol, solvents, oil and lubricants.


  • Compact dimensions
    diameter 13 mm, length 75 mm
  • Small dosage volumes, high flow rates
    smallest volume 0.25 µl, flow up to 9 ml/min
  • High dosage precision
    precision CV 1 % at low volumes
  • Long service life
    wear-resistant tungsten carbide or ceramics
  • Low pulsation delivery, low shear stress
    rotary micro annular gear technology
  • Analytical instrumentation
  • Fuel cells
  • Laboratory automation
  • In vitro diagnostics

Reduction gear

reduction gear unit,
reduces pump speed,
stabilizes motor speed in low RPM-range, increases drive torque

Programmable controller S-ND

for micro annular gear pumps from the low pressure series and mzr-xx42,
programmable controller for continuous and discrete dosing

Controller S-KG

for micro annular gear pumps from the low pressure series and mzr-xx42,
4-Q-DC controller for continuous dosing
Flow rate 0.15 – 9 ml/min (min. 0.0015 ml/min *)
Viscosity range 0.3 – 100 mPas (max. 1,000 mPas *)
Precision CV 1 % (Coefficient of Variation CV)
Velocity range 100 – 6000 rpm (min. 1 rpm *)
Fluid connection slip fittings with outside diameter 2 mm optional: manifold assembly M2.1
Wetted parts stainless steel 316L, ceramics, tungsten carbide Ni based, epoxy resin, optional: alloy C22 (2.4602) instead of stainless steel, ceramics instead of tungsten carbide; shaft seal: graphite-reinforced PTFE, stainless steel 316L, optional: alloy C276 (2.4819) instead of stainless steel; static seals: FPM, optional: EPDM, FFPM
Motor DC-motor with graphite brushes, assigned power rating 3 W, nominal voltage 18 V, digital magnet encoder 16 counts per turn
Dimensions (L x W x H) Ø 13 mm, length 75 mm
Weight approx. 50 g (manifold assembly approx. 65 g)
Electrical connection 10-pole connector
Differential pressure range 0 - 3 bar (44 psi)
Maximum inlet pressure 1 bar
Operating temperature range -20 ... +60 °C
Displacement volume 1.5 µl
Smallest dosage volume 0.25 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-2521
Manual mzr-2521 (1.4 MB)
Betriebsanleitung mzr-2521 (2.0 MB)
1.4 MB
Faulhaber Motion Manager
Faulhaber Motion Manager (13.0 MB)
Faulhaber Motion Manager (13.0 MB)
13.0 MB
Micro annular gear pump mzr-2521
Micro annular gear pump mzr-2521 (109 KB)
Mikrozahnringpumpe mzr-2521 (109 KB)
Micropompe gérotor mzr-2521 (110 KB)
109 KB