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 fibres, 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 utilises 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 fibres and powders can be easily prepared and placed into the system. A consistent packing density of powders and fibres 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.

Features of Zeta Potential Analyzer ZPA 20

• patented bidirectional oscillating streaming potential method.
• powerful stepping motor for oscillation frequencies of up to 0.5 Hz.
• measuring probes for voltage, current, conductivity, pH value, pressure and temperature.
• measuring duration for a single zeta potential typically under 1 minute.
• Optional Liquid Dosing Unit LDU 25 for automated pH value changes.
• Measuring cells for fibres, powder & granulate materials or for plate shaped solid materials.

Technical Specifications

Measuring principle

• bidirectional oscillating streaming potential / current

Streaming potential measurement

• range and accuracy (automatic range switching)

Standard range

• ± 250 mV ±(0.2% + 3.8 µV)

Extended range

• ± 2500 mV ±(0.2% + 76 µV)

Streaming current measurement

• range and accuracy (automatic range switching)

Standard range

• ± 250 µA ±(0.2% + 3.8 nA)

Extended range

• ± 2.5 mA ±(0.2% + 76 nA)

Operating pressure

• 0 … 2000 mbar

Absolute pressure measurement

• up to 3000 mbar ±(0.5% + 92 µbar)

pH measurement and change

• automatically changeable with optional liquid dosing unit LDU 25

pH range

• pH 2 … pH 12

Conductivity

• 0.01 … 100 mS/cm

Measuring cells

MC-ZPA/PF

• for fibres, powders and granulate materials

MC-ZPA/S

• for plate shaped solid materials; sample dimensions: 20 mm x 10 mm x up to 2 mm

Typical measuring duration for zeta potential

• < 1 min

Dimensions (L [mm] x W [mm] x H [mm])

• 617 x 322 x 580

Weight

• 23 kg

Power supply

• 100 … 240 VAC; 50 … 60 Hz; 4 A