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About preeflow® eco-DUO Precision Metering, Mixing and Dispensing System

The preeflow eco-DUO high precision volumetric metering, mixing and dispensing unit measures, mixes and dispenses a wide range of materials for two-component dispensing with absolute control. The preeflow eco-DUO 330, preeflow eco-DUO 450 and eco-DUO 600 are two-component precision volumetric, positive displacement, dosing/mixing/dispensing systems that give you accuracy and repeatability using a progressive cavity pump principle.

The preeflow eco-DUO uses the precision dispensing technology of the preeflow eco-PEN; by integrating two eco-PENS through a manifold and a static mixing nozzle, the eco-DUO provides extremely precise metering, mixing and dispensing of critical two-part materials like epoxies and silicones.

“We are very satisfied with the performance of the eco-DUO450. The system has been reliably meeting
our requirements for many years with minimum maintenance.” – Petra Hofmann, Seba Dynatronic Mess- und Ortungstechnik GmbH

We can integrate the preeflow eco-DUO 330, preeflow eco-DUO 450 and eco-DUO 600 into any robotic dispensing system.

Features & Benefits

  • Genuine volumetric meter, mix and dispense dosing
  • Accuracy of ±1%, >99% of the time
  • Viscosity independent
  • Suck back effect
  • Easy to clean
  • Controllable dosing flow


  • Electronics packaging
  • Semiconductor
  • Medical
  • Biological chemistry
  • Laboratory
  • Photovoltaic
  • Optics and photonics



eco-CONTROL EC200 2.0 for preeflow eco-pen eco-CONTROL EC200 2.0

The eco-CONTROL EC200 2.0 control system provides total control of preeflow volumetric valves during the dispensing process. It’s designed for either benchtop or rack-mounted location, dependent on the model.

Operating principle

The unit is operated via a bright, 7” touch screen, making it simple to use. External signals can be connected via I/O ports to a PLC for control in automated lines. Up to 100 dosing programs, with part management can be stored locally.

Error messages for filling level and motor current are also monitored (an RS232 interface is provided).

It is possible to control two eco-PEN precision volume dosing units (as a factory-fit option).


  • Quantity and start/stop program
  • Set-volume readout in g or ml
  • Dosing flow readout in ml/min and g/min
  • Storage of up to 100 dosing programs with part management
  • Set pressure and actual pressure readings in bar/psi

Selector Guide

Model Smallest dose Adjust flow rate Weight
For two part formulations
0.005 ml (5μl) 0.1 – 6.60 ml/min 1230g
For two part formulations
0.010 ml (10μl) 0.2 – 12.00 ml/min 1230g
For two part formulations
0.030 ml (30μl) 0.6 – 32.00 ml/min 1880g

Other Information

Syringe adapter with integrated bleed valve

For use in applications where the chosen material is supplied in syringe barrels, an optional adapter with an integrated bleed valve allows for direct dispensing without the risk of air bubble formation.

Cartridge adapter for preeflow eco-PENs

Made of black anodized aluminium and stainless steel, and FFKM sealing elements, the syringe adapter is compatible with almost all materials and allows for air bubble-free dispensing, even after several syringe barrel changes.

With a 1/8-inch external thread, the adapter is well suited for the eco-PEN, eco-DUO series 300, 330 and 450 and eco-DUOMIX450.

Helpful Resources

See how the preeflow eco-DUO 450 works as part of a real application in this dispensing Case Study:

Case Study - preeflow eco-DUO BPR Medical preeflow® eco-DUO volumetric adhesive dispensing helps ensure integrity of lifesaving medical device

A medical application using volumetric dispensing equipment to ensure the high quality and efficient production of a life saving cannula valve.


See also our Technical Articles and White papers page for the following white paper and more:

The “Endless Piston” Pump – Technology for Precision Dispensing by Peter Swanson
preeflow rotor and stator
Precise Dispensing of Two-Part Materials by Paul Whitehead


All Downloads

Filename Size Download
preeflow eco-DUO Technical Data Sheet All Models 0.57MB Download
eco-CONTROL EC200-DUO Product Data Sheet 0.95MB Download
preeflow Microdispensing Brochure cover 2.42MB Download
The Endless Piston Pump Technology for Precision Dispensing 0.37MB Download
Case study: preeflow® eco-DUO volumetric adhesive dispensing helps ensure integrity of lifesaving medical device 1.15MB Download

Ordering Information

Part number Description
VIS21529 preeflow eco-DUO 330
VIS20639 preeflow eco-DUO 450
VIS21175 preeflow eco-DUO 600
VIS22402 preeflow eco-CONTROL EC200-2.0 DUO dispense controller
VIS21626 eco-DUO330 Package
incl. eco-DUO 330, eco-CONTROL EC200 DUO, 2 x pressure sensors
VIS20646 eco-DUO450 Package
incl. eco-DUO 450, eco-CONTROL EC200 DUO, 2 x pressure sensors
VIS21204 eco-DUO600 Package
incl. eco-DUO 600, eco-CONTROL EC200 DUO, flowscreen control panel
VIS20326 preeflow eco-REMOTE 232 port for external channel selection
VIS21750 Syringe adapter for eco-PEN and eco-DUO 300/330/450
VIS21811 Syringe adapter with integrated bleed valve


Let’s start by talking about your application

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  • Last updated: November 2023
  • Version: 8.0

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.