The Micro Dispense Module µDispense® is a compact system for the precise dosing and metering of liquids in the microliter to milliliter range.  µDispense® guarantees a process-safe liquid handling, with high precision and trueness. It reduces maintenance expenses due to its long service life. The size of a Micro Dispense Module corresponds to the half-height syringe pumps format. With the Cavro® script language protocol and an extended  command set, syringe pump programs can be processed. Due to the interface compatibility, syringe pumps can easily be replaced.

The Micro Dispense Module is characterized by its modular design with optional modules, such as shiftable in- and outlet, optional pump size, filter and flow sensor. The core component is a micro annular gear pump, a robust and highly precise device with an extremely long service life and low pulsation. The quiet and rotatory operating micro annular gear pump allows dispensing smallest volumes of liquid on the one hand, and a continuous, uninterrupted and reversible flow on the other hand. Rinsing with high flow rates is also possible with the same system. A powerful electronics with integrated drive controller monitors and controls the system. Together with the flow sensor a closed loop controlled flow is possible.


  • Analytical instrumentation
  • Biotechnology
  • Laboratory automation
  • Blood typing
  • Ion channel screening
  • Flow Cytometry
  • Cell sorting
  • DNA isolation
  • Chromatography
  • IVD

Dispense Module in syringe pump format

  • size of half-height syringe pumps format
  • communication via syringe pump programming commands and expanded command set
  • compatible integration in analytical devices
  • modular design (fluid in- and outlet, sensors, filter, materials)
  • low noise level

Micro annular gear pump

  • high precision of dispense volume and volume flow
  • discrete dosing of smallest liquid volumes
  • continuous, uninterrupted volume flow with low pulsation
  • wide dynamic range of pump with low dosing volumes and high volume flow for rinsing without replacement of components
  • long service life and low life cycle costs
  • low cycle times

Sensor control and monitoring (optional)

  • precise controlled volume flow
  • process monitoring and documentation

Typical liquids

  • Organic and inorganic solvents
  • Nutrient media
  • Water solutions

Technical data

  • Pumps
    mzr-2521, mzr-2921, mzr-4622
  • Flow rate range (without control)
    up to 72 ml/min *
  • Controlled flow rate range
    10 - 1,000 µl/min (H2O) / 50 - 2,500 (Methanol) *
    Additional media on request.
  • Dosing volume
    beginning from 1 µl
  • Precision CV
    < 1 % (Coefficient of variation CV)
  • Differential pressure range
    up to 3 bar (43.5 psi) *
  • Storage temperature range
    -20 … +65 °C (+104 ... +149 °F)
  • Liquid temperature range
    -5 ... +60 °C (+23 ... +140 °F) @ 20 ... 95 % humidity
  • Viscosity range
    up to 20 * mPas
  • Liquids
    aqueous solutions, solvents
  • Materials of pump
    stainless steel 316L, ceramics, tungsten carbide Ni based, epoxy resin; shaft seal: graphite-reinforced PTFE, stainless steel 316L; static seals: FFPM, optional: FPM, EPDM
  • Additional materials
    manifold: PEEK™;
    valve: PEEK™, FFPM optional: PPS, FPM, EPDM;
    volume flow sensor: borosilicate glass;
    filter: stainless steel
  • Seal materials
    static seal: FFPM, optional: EPDM, FPM
  • Electronics
    ARM Cortex M3 microprocessor
  • Motor
    brushless DC-motor (BLDC); nominal voltage 24 V; torque 3.3 mNm; analog hall sensors
  • Electrical connection
    D-sub plug, 15-pole (male connector)
  • Power supply
    24 V DC ±10 %, max. 1.5 A
  • Interface
    RS-232 and RS-485 with 9600 or 38400 Baud;
    CAN with 100 and 125 kBaud
  • Protocol
    standard commands of syringe pumps OEM Communication (OC) protocol and Data Terminal (DT) protocol
  • Addressing
    max. 15 devices with RS-485 Bus ("daisy-chaining"); max. 15 devices with CAN-Bus
  • Inputs and outputs
    2 additional digital inputs with TTL Level; 3 additional outputs with TTL level
  • Fluid connection
    1/4"-28 UNF
  • Accessories
    additional fluidic inlets and outlets, filter, gear box, volume flow sensor
  • Dimensions (L x W x H)
    106.7 x 44.4 x 127.0 mm (4.2" x 1.75" x 5.0")
  • Weight
    approx. 800 g
  • Remarks
    * depending on the size of the micro ring gear pump.
  • 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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