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Zeta Potential Analyzer – ZPA 20 DataPhysics Instruments Logo

Zeta Potential Analyzer – ZPA 20

The Zeta Potential Analyzer ZPA 20 uses the patented bidirectional oscillating streaming potential analysis to measure the zeta potential of fibers, powders and plate shaped solid materials. Applications that depend on the adhesion between solids, the adsorption and chemical reaction of ions/molecules, surfactants, polymers etc. can all benefit from investigating the zeta potential and its changes depending on the pH value.

The Zeta Potential Analyzer ZPA 20 is a compact measuring instruments that utilizes the patented bidirectional oscillating streaming potential method. It is designed to measure the zeta potential of various macroscopic solid samples with highest accuracy and within shortest time.

The ZPA 20 uses removable measuring cells for various types of materials. Hence, plate shaped samples as well as fibers and powders can be easily prepared and placed into the system. A consistent packing density of powders and fibers can be ensured using a torque wrench. The ZPA 20 features high precision measuring probes for voltage, current, conductivity, pH value, pressure and temperature.

With its powerful stepping motor the ZPA 20 can create an oscillating flow of the electrolyte with frequencies of up to 0.5 Hz and hence, the zeta potential can be measured in under a minute with a high statistical quality and across a multitude of applied pressures.

Concentration dependent measurements can be done using the optional liquid dosing unit LDU 25. For example, the isoelectric point can be determined automatically by adding basic or acidic solutions to the electrolyte and hence, changing the pH value.

Zeta Potential Analyzer ZPA 20

Main features


The ZPA 20 is controlled via the ZPASoftware. Learn more about the Software for the ZPA 20.


The ZPA 20 can be used with different measuring cells for various materials. With the liquid dosing unit LDU 25 concentrations in the electrolyte can be changed automatically like e.g. the pH value. Learn more about the available accessories.

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