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Dynamic Foam Analyzer


Time-dependent analysis of bubble size in liquid foams

Dynamic Foam Analyzer – DFA100FSM for the bubble structure liquid foams

The FSM Foam Structure Module for the DFA100 captures the bubble size and size distribution of foam using intelligent video image analysis. The results help you to produce foam with the shape you want it to have. They also show the decay of long-lasting foam, long before it actually collapses, thus supporting you in optimizing foam stability.


  • Foams for washing and cleaning

  • Foams in food and personal care products

  • Surfactant development

  • Flotation as a method for separating solids

Measuring methods

  • Foamability and foam stability using the optically detected height of foam created reproducibly

  • Foam formation behavior of heavily foaming liquids using stirring cycles

  • Optically detected foam bubble sizes and their statistical distribution

  • Moisture and drainage behavior of foam using its electrical conductivity

  • Carrying out a measurement up to 20 consecutive times and displaying the results together

Measuring results

  • Bubble count per mm², mean bubble size and standard deviation as well as bubble radius directly after foam formation

  • Decay observation by recording time-dependent values of all bubble size parameters

  • Bubble size histogram showing size distribution

  • Bubble count half-life

  • Additional results for foam height and volume from DFA100 main instrument

  • Dynamic Foam Analyzer – DFA100FSM for the bubble structure liquid foams

  • Dynamic Foam Analyzer – DFA100FSM for the bubble structure liquid foams

Precise investigation of bubble size and quantity

It depends on the particular product whether foam with large or small bubbles is desired. Homogeneity is also important as an indirect measurement of long-term stability or for the sensory perception of foam. With the FSM, you can express these foam properties in solid numbers. To enable different types of foam to be investigated with the same precision, the resolution of the optical system can be easily adapted to small or large pore sizes.


Scientific characterization of foam

Foam in everyday products as well as technical applications appears in manifold forms and is often produced on purpose, but can also be undesired. Our DFA100 characterizes almost every aspect of foam, putting a wide range of methods into practice with impressive ease of use.

Revealing time-dependent changes in structure

Before foam collapses, its structure starts to change, i.e. large bubbles are formed and smaller ones disappear. Thanks to versatile timing options, this process is accurately recorded and analyzed. The results help to specifically optimize the liquid in order to obtain stable or rapidly decaying foam depending on the requirements. Moreover, foam height measurements and even liquid content detections can be carried out within the same experiment to obtain a comprehensive picture of foam behavior.

ADVANCE Software

Automatic analysis and powerful evaluation

The simple operation of the instrument goes hand in hand with the intuitive user interface of our ADVANCE software. Easy to create automation programs control the measurement run and allow cyclical repetitions. The synchronous display of all time-related data for foam height, bubble structure, and liquid content is particularly convenient.


  • Intuitive software with a workflow-oriented user interface

  • Swift and repeatable analyses thanks to measurement templates and powerful automation functions

  • Result management made easy with clear and comprehensive charts and tables

  • A wide range of results describing foam formation, stability, and decay

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