The ZPA 20 zeta potential analyzer is a laboratory measuring instrument for an accurate and fast zeta potential measurement, i.e., the charge near the surface in solution. It uses a patented measuring method based on the bidirectional measurement of the streaming potential or the streaming current.

The ZPA 20 uses removable measuring cells for different types of materials. Therefore, plate-shaped samples as well as fibres and powders can be easily prepared and placed in the corresponding measuring cell. A consistent packing density of the powders and fibres is easy to obtain. The ZPA 20 has measuring sensors for voltage, current, conductivity, pH, pressure, and temperature.

Thanks to its powerful stepper motor, the ZPA 20 can make the electrolyte flow through the measuring cell at different speeds and pressures, alternately from opposite directions. This results in measurement results with high statistical accuracy. Concentration-dependent measurements can be realised with the optional LDU 25 liquid dosing unit. Thus, one can, amongst other things, determine the isoelectric point automatically.

Features of the ZPA 20 zeta potential analyzer:

• patented measuring method based on bidirectional analysis of the streaming potential or streaming current

• powerful stepper motor for oscillations with up to 0.5 Hz

• measuring probes for voltage, current, conductivity, pH, pressure, and temperature

• typical measuring time for individual zeta potentials less than one minute

• LDU 25 optional liquid dosing unit for automated change of pH value or other changes in concentration