Bubble Pressure Tensiometer

Measuring the Dynamic Surface Tension High-performance laboratory tensiometer

Multifunctional Precise Auto Mode – Measurements through the whole • Meaures the surface tension using the SITA bubble lifetime range differential pressure method – independent of • Evaluating surfactant effects immersion depth • Analysing the kinetics of surfactants • Large bubble lifetime range: 15 ms (highly • Characterizing the wetting behaviour of dynamic) to 100,000 ms (quasi-static) surface active agents • Automatic calibration in water, monitoring of the calibration process Online Mode – Continuous measurement • Measurement of temperature dependencies • Analysing the ageing behaviour Flexible • Evaluating the sample stability • Fast and easy set-up of the device • Intuitive operation Single Mode – Single measurement • Portable in secure storage case • Control and test requirements • Battery operation • Concentration measurements

Optimized for R & D and quality control Measuring the surface tension, analysing surfactants

Windows-Software SITA-LabSolution

• Automation of laboratory measurements and active ingredient analyses • User-defined sequences for Analysing the kinetics of recurrent measuring and surfactants in research & controlling tasks development • Intuitive operation • Efficient conduction Quality control through of experiments comparision with reference • Comfortable report function and limit values for creating measurement protocols and reports Automation of measuring and analysis tasks

Large bubble lifetime range from highly dynamic to quasi-static

Precise and flexible through Laboratory automation innovative measuring Controlling a wide range of accessories with the Windows-Software SITA-LabSolution method

Robust, application- optimised capillaries Buerette (fluid dosing unit) Sampler • Active ingredient analyses • Automatic measurements of a large • Evaluation of concentration curves quantity of samples for quality control

Thermostat Magnetic stirrer, (heating)stirrer • Automatic tempering Sample conditioning: • Analysis of temperature curves • Homogenisation • Sample tempering

www.sita-lab.com Lab Solutions Measuring principle

fresh surface hemisphere minimum pressure maximum pressure

Measuring the dynamic surface tension with the SITA bubble pressure continuously with its radius. The surface tension is calculated from the method enables high precision and flexibility without difficult adjustment deviation between pressure maximum and minimum. The calibration is of the immersion depth. This is done by pumping air through a capillary carried out automatically with water. Thereby, the radius of the capillary into the liquid to be analyzed. The pressure within the bubble changes is taken into account.

Technical data

Surface tension Liquid temperature Measuring gas Ambient air, depressurized alternatively: inert gases Measuring range (10...100) mN/m (dyn/cm) Measuring range (-20...125) °C Display Colour LCD, illuminated Measuring deviation max. 1% of full scale value Measuring deviation max. 0.5 %, adjustable Storage 4 GByte, 64 methods Resolution 0.1 mN/m Resolution 0.1 °C Dimensions Main unit: 200 x 140 x 60 mm³ Reproducibility 0.5 mN/m Reproducibility 0.3 K (HxWxD) Sensor: 200 x 35 x 90 mm³ Weight 1,870 g Bubble lifetime/surface age General data Adjustable range (15...100,000) ms Power supply 5 V/500 mA (USB), Measuring deviation max. 1 ms integrated battery Resolution 1 ms Acceptable ambient (-20...50) °C/(10...40) °C temperature Control deviation adjustable (storage /operation)

SITA Messtechnik GmbH Tel. + 49 (0)351 871 8041 Gostritzer Straße 63 Fax + 49 (0)351 871 8464 01217 Dresden www.sita-lab.com Germany [email protected] Poligono Industrial Azitain, Parcela 3A - 20.600 EIBAR - SPAIN Phone: +34 943 82 00 82 - Fax: +34 943 82 01 57 [email protected] www.neurtek.com