Measuring cells

The modular design of the ZPA 20 allows the measuring cells to be easily exchanged. The next sample can be prepared in a second sample cell during the measurement. Different cells are available for different sample types. Corresponding tools for the measuring cells ensure easy and repeatable sample preparation.

MC-ZPA/PF measuring cell for fibers, powders, granules

The MC-ZPA/PF is a cell for measuring the zeta potential of fibers, powders and granules. The sample material is compressed between two compression discs. The optional compression tool with torque wrench can be used to ensure repeatable compression.

MC-ZPA/S measuring cell for plate-shaped solids

The MC-ZPA/S is a cell for measuring the zeta potential of plate-shaped solids. Using a special cutting tool, a sample can be cut from plate-shaped solids such as plastic sheets. The dimensions of the gap, which allows the electrolyte to pass along the sample, can be adjusted with the integrated micrometer screw gauge.

• sample area: 20 mm x 10 mm
• max. sample height: 2 mm
• gap range: 0…0.3 mm

MC-ZPA/K measuring cell for solids

The MC-ZPA/K is a cell for measuring the zeta potential of plate-shaped solid samples which cannot be brought to the sample size of the MC-ZPA/S. The size of the gap that allows the electrolyte to flow along the sample can be adjusted using different spacers. Optionally, the counter surface of the sample can be provided with material in the dimensions of the MC-ZPA/S and measured there.

• sample area: at least 35 mm x 15 mm or at least 35 mm diameter
• maximum sample thickness: 45 mm

MC-ZPA/HF 1 measuring cell for flexible tubes

The MC-ZPA/HF 1 is a cell for measuring the zeta potential on the inner surface of tubes. Various adapters can be used to measure tube diameters within the specified diameter range.

• tubes with an outer diameter of 0.9 mm to 6.0 mm and a length of at least 100 mm

MC-ZPA/HF 3 measuring cell for hollow fiber membranes

The MC-ZPA/HF 3 is a cell for measuring the zeta potential through the wall of hollow fiber membranes.

• Hollow fiber membranes with an outer diameter of max. 2.0 mm and a length of at least 100 mm

MC-ZPA/CM 1 measuring cell for radial flow ceramic membranes

The MC-ZPA/CM 1 is a cell for measuring the zeta potential of tubular ceramic membranes. The ceramic membranes are flowed through radially. Optionally, the flow direction can be changed.

• samples with an outer diameter of 10 mm, 13 mm, 25 mm, and 30 mm each with a sample length of 100 mm

MC-ZPA/CM 2 measuring cell for axial flow ceramic membranes

The MC-ZPA/CM 2 is a cell for measuring the zeta potential of tubular ceramic membranes. The ceramic membranes are flowed through axially.

• samples with an outer diameter of 10 mm, 13 mm, 25 mm, and 30 mm each with a sample length of 100 mm

Contact us nowmail_outline

Liquid dosing unit LDU 25

The Zeta Potential Analyzer ZPA 20 can use a liquid dosing unit LDU 25 to automatically change concentrations inside the electrolyte. Hence, for example the pH value can be changed after each zeta potential measurement and the isoelectric point is determined in a series of experiments during which no manual user intervention is required.

Since the ZPA 20 can measure zeta potentials exceptionally fast even the adsorption kinetic of surfactants can be analyzed by dosing surfactant solution to the electrolyte. For detail see the corresponding application example.

The liquid dosing unit LDU 25 can be equipped with up to four DataPhysics Instruments syringe modules (ESr-LDU) performing independent dosing operations. This allows to dose different solutions individually. There are two options available for dosing: The first allows for a (direct) dosing of the syringe content (SH-LDU) while the second one connects to a liquid reservoir via an additional valve (RRS 25) in order to refill the syringe.

For convenience two pre-configured packages are available:

• The LDU 25 R1 package consists of one LDU 25, one syringe module ESr-LDU and one refill and rinse system RRS 25.
• The LDU 25 R2 package consists of one LDU 25, two syringe module ESr-LDU and two refill and rinse systems RRS 25.

For further details please refer to the LDU brochure.

Contact us nowmail_outline LDU brochurefile_download