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DT-100/DT-110 – Particle size measurement of concentrated dispersions

By means of the acoustic spectrometer DT-100 and DT-110 the particle size distribution of liquid, concentrated dispersions in its original state can be measured. The system is using the latest theories, the size range is 5 nm to 1000 µm.

These acoustic spectrometers are measuring the sound speed and the attenuation of short ultrasound pulses for a set of frequencies, typically from 1 to 100 MHz (“transmission pulse technique” or “tone burst method”). The data will be recorded at different gaps between ultrasound sender and detector to improve the accuracy of the signals. Due to the wide frequency range of this unique technique, very small (< 100 nm) as well as coarse particles (>> 10 µm). can be measured with high precision. The variable gap between sender and detector enables the characterization of diluted (< 1 Vol.-%) and concentrated (up to 50 vol.-%) dispersions. The Windows-based software takes into account the different ultrasound-wave-particle interactions as scattering, viscous losses and thermodynamic effects.

Measuring principle of DT-100/DT-110

Benefits and key features

  • No dilution, no sample preparation
  • Measurement of the acoustic attenuation spectrum from 1 to 100 MHz with highest accuracy and reproducibility
  • Wide concentration range (0.1 – 50 Vol-%), due to variable sender detector gap
  • Wide particle size range (5 nm – 1000 µm)
  • No calibration necessary
  • Measurement of sedimenting and high viscous samples (up to 20000 mPas)
  • On-line-measurement possible (by-pass setup)
  • DT-100: sample volume 15 – 150 ml
  • DT-110: small volume < 5 ml
  • Can be combined with zeta potential measurement (DT-1202)

References and norms

/1/ ISO 20998-1 Measurement and characterization of particles by acoustic methods.
/2/ A. Dukhin, P. Goetz: Characterization of Liquids, Nano- and Microparticulates, and Porous Bodies using Ultrasound. 2nd Edition. Oxford: Elsevier, 2010.
/3/ PARTICLE WORLD 19; p. 18 – 19; “Characterization of liquids, dispersions, emulsions and porous materials using ultrasound”.


This software-controlled unit is designed to enable the particle size and zeta potential measurement independent of the pH or the amount of an additive. The system can be programmed to carry out automatically different types of protocols (dosing amount of additive/acid/base, pH-value and time).

  • Optionally one or two 5 ml-burettes
  • pH: 0.5 – 13.5 ml
  • minimal amount of titration: about 20 µl (depending on viscosity)
  • chemical resistant teflon probe
  • suitable also for high viscous additives

Two different probes are available to measure the electric conductivity. Both are fully integrated in the DT-software:

  • conductivity probe for aqueous solvents: 10-4 – 10 S/m
  • conductivity probe for organic solvents: 10-11 – 10-4 S/m

The probe for measurements in organic solvents is also available as a separate device: DT-700.

Other instruments

DT-1202Acoustic attenuation spectroscopy 5 nm – 1,000 µm
Bettersizer S3 seriesStatic light scattering and dynamic image analysis 0.01 – 3,500 µm
Bettersizer 2600Static light scattering 0.02 – 2,600 µm
Bettersizer STStatic Light Scattering 0.1 – 1,000 µm
BeNano seriesDynamic Light Scattering 0.3 nm – 15 µm
BeVision D2Dynamic image analysis 2 µm – 10,000 µm

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