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Analysing foam parameters, Controlling surfactant effects

The new generation SITA FoamTester

20 years of experience meets the needs of innovative foam testing

The SITA FoamTester analyses the characteristics of surfactant-containing liquids easy, fast and precise with automated measuring sequences.


• Fully automated foam analysis

• Precise reproducible foaming

• Innovative optical measuring method

• Measuring foam and liquid volume

• Analysing foam structure

• Recording drainage

• Automated cleaning


Automated SITA foam testing

Functionial components of the SITA FoamTester

Benefits of automated foam testing

Autonomous repetition of test runs without intervention by the user
Immediate statements about the reproducibility
Fast and easy screening of test and sample parameters

Convenient sample handling

Automatic sample preconditioning (e.g. temperature, concentration of additives) with external devices
Integrated sample reservoir with magnetic stirrer for running multiple test series

Automated self-cleaning system with external liquid supply (e.g. tap water)


Flexible experimenting

Easy and free creation of experiments at the office PC by drag‘n‘drop using fully parameterisable device tasks and supportive functions (loops and timers)

Creating multiple re-usable templates and exactly repeatable test routines to select and start by a single touch at the device

Instant start with test routines for typical applications pre-defined by SITA

Create foam

Differentiation of various sample formulations and reproducible test sequences using an application-oriented foam creation with proven SITA method

Established SITA standardised stirring disc
Variable stirring parameter: speed, duration, acceleration, direction, intervals
Minor influence of the vessel glass on foam formation
Removable measuring vessel with stirring unit

Measure foam

Use of optical, contactless measuring methods

Foam Surface Scanner

Determination of the topography of the foam surface and therefore the total volume using the structured-light method

Foam Interface Scanner

Determination of the foam structure and the liquid level by optimal use of a movable camera system, which illuminates and observes the measuring vessel at an angle Θ above the critical angle for total internal reflection

Automatic acquisition of the total volume (liquid and foam) by the Foam Surface Scanner, of the residual liquid volume by the Foam Interface Scanner and of the foam volume in combination
Analysis of the foam volume of clear and cloudy liquids
Recording of the foam structure over the range of 130 mm x 50 mm
All measurements in the same measuring vessel, connected to the thermal circuit

Analyse foam and understand foaming

Convenient evaluation of measuring data with the software SITA-FoamLab in the office

Complete transparency of the measuring progress and the results by intuitive visualisation

Analysis of the slope and the resulting volume during foam formation

Analysis of the foam decay and the drainage

Analysis of bubble sizes and shapes in the foam structure

Comprehensive characterising of foam and foaming
- By the determination of further parameters such as half-life period and foam density
- By the individual height-dependent evaluation of foam structure parameters such as average bubble size or circularity index
- By tracking time dependent changes in the foam structure
- Flexible comparison by clear display of different measuring sequences

Easy export of data and results for documentation


Fields of Application

Optimisation of surfactant containing products in

Product Development
Raw material development and selection
Product processing and application

Quality and process assurance


Application examples


Influence of the formulation and raw materials on foaming behavior
Foam stability of toothpaste and foam baths

Foam structure as a reference point for user perception


Cleaning agents

Influence of temperature on the foaming of spray cleaners

Influence of contaminations on the foaming in cleaning baths


Cooling lubricants

Influence of water hardness on aging process
Durability of defoamers

Optimisation of the filtration process to prevent foaming


Inks, paints and coatings

Effectiveness of defoamers


Liquid processing industry

Foaming behaviour of flow suspension in paper industry

Recipe optimisation to reduce foaming in bottle filling of beverages
Adjustment of foaming production auxiliaries in textile manufacturing

Foaming effects of polymers in plastic production


Technical data

Foam creation
Recommended sample volume (200 ... 500) ml
Usable measuring vessel volume

1,500 ml (incl. foam)

height 180 mm
diameter 110 mm

Capacity of sample reservoir
2,000 ml
Sample tempering of measuring vessel and sample reservoir
(0 ... 60) °C using a optional thermostat
Stirring speed (0 ... 2,000) U/min (bidirectional)
Adjustable stirring programs speed, duration, direction, acceleration
Analysis of foam volume (foam creation and decay)
Measurement values
total volume, foam volume, liquid volume
Evaluated parameters max. foam volume, foam half-life, flash foam
Measuring range total volume (0 ... 1,500) ml; resolution 1 ml
Measuring range liquid volume
(0 ... 500) ml; resolution 1 ml
Analysis of foam structure
Parameters number of bubbles, bubble size distribution, average bubble diameter, circularity index
Evaluation area height 130 mm
width 50 mm
Resolution 3,200 dpi
General data
Rinse connection 3/4“ (2 ... 6) bar
Operating temperature (10 ... 40) °C
Power supply (100 ... 240) V / (50 ... 60) Hz,
300 W
Dimensions (HxWxD) (770 x 450 x 305) mm
Weight approx. 35 kg
PC interface



Available models


SITA Foam Testing System Expert

consisting of SITA FoamTester und SITA-FoamLab Expert

SITA Foam Testing System Basic

consisting of SITA FoamTester und SITA-FoamLab Basic

Convenient sample handling
Flexible experimenting
Application-oriented foam generation with proven SITA method
Optical, contact-free measuring systems
Foam creation analysis
Foam decay analysis
Foam structure analysis

Optional: External laboratory devices for sample conditioning

Extension of experiments by additional functions for sample conditioning

Automatic integration and direct control within the test sequence


Automatic dispenser CAT Contiburette μ10D


for the dosage of liquids

Resolution: 10 µl

Dosing speed: 0,2 - 20 ml/min

Thermostat Lauda ECO RE 415S


for cooling and heating of sample liquids

Temperature range: (-15...200) °C

Ambient temerature range: (5 ... 40) °C

Thermostat Lauda ECO E4S


for heating of sample liquids

Temperature range: (room temperature...200) °C

Ambient temerature range: (5 ... 40) °C

The market launch of the SITA FoamTester is supported within the scope of the German development programme "Market launch of innovative products and product design".

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