zetacadbZetameter ZetaCAD

Surface and large particles zetametry using streaming potential or streaming current

Overview - Principle

ZetaCAD has been specially designed to automatically determine the Zeta Potential by the technique of streaming potential/current measurement. An electrolyte is forced to pass through a capillary or a porous plug by a pressure gradient.

The excess charges around the particles or wall are carried along by the liquid. Their accumulation down stream causes the build-up of an electric field which drives an electric current back (by ionic conduction through the liquid) against the direction of the liquid flow. A steady state is quickly established and the measured potential across the capillary is called the streaming potential.

ZetaCAD Principle





This technique concerns mainly samples having large particles (> 50 µm) or surfaces able to be retain in the cell, or surfacic membranes or hollow fibers samples, where the electrolyte can pass through under a pressure gradient. ZetaCAD gets the followings characteristics:

Differential pressure

- 500 to + 500 mbar

Streaming potential

-2 400 to +2 400 mV

Streaming current

- 240 to + 240 µA


0 to 20 mScm -1


2 to 12


  • Reliable and simple to setup
  • Measurement and rinsing of the system are fully automated
  • Menu driven software Windows based
  • Data acquisition, treatment and export available with Excel


  • Powders
  • RO Membranes
  • Hollow fibers
  • Textile fabrics, fibers
  • Geology-Minerals
  • Glass
  • Polymers
  • Hair


Download some references and literature published from ZetaCAD end-users.

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