The MBP 200 bubble pressure tensiometer from DataPhysics Instruments is a powerful measuring device for determining the dynamic surface tension of liquid solutions. To do so, it uses the maximum bubble pressure method.

The MBP 200 can direct a volume flow of gas through a capillary into a liquid, creating bubbles at the capillary opening. In order to track the pressure within the gas bubbles, the device contains a sensitive pressure sensor. Based on the detected pressure maxima, the surface age of the bubble and the dynamic surface tension is calculated. Additionally, the MBP 200 has a valve arrangement, which can generate volume flows of different strengths, to realise different surface ages for the measurement.

The MBP 200 can be used to determine dynamic surface tensions in the range between 10 mN/m and 100 mN/m for surface ages between 5 milliseconds and 200 seconds. This makes the device ideal for analysing liquids, such as surfactant solutions, in a wide dynamic range.

Features of the MBP 200 bubble pressure tensiometer

• the MBP 200 can be fitted with both reusable glass capillaries and disposable capillaries. The disposable plastic capillaries can be used in a wide dynamic range. They reduce the effort required for cleaning and prevent cross-contamination.

• the MBP 200 can measure high differential pressures up to over 3400 Pascal, which enables the analysis of highly viscous liquids, such as certain oils.

• the temperature of the sample vessel can be set between -15 °C and 135 °C with the help of various optional temperature control units. This allows the dynamic surface tension to be analysed in dependence of the temperature.

• with the optional LDU 25 liquid dosing unit, concentration series can be carried out automatically. This enables users to determine the dynamic surface tension for different surface ages as a function of the concentration, for example of a surfactant or additive, in a single measuring procedure.

• the sample vessel is surrounded by a splash guard, which reduces the cleaning effort.

• a collision protection mechanism prevents the capillary from colliding with the bottom of the vessel. This prevents damage to the capillary and the device.

• upgradeable with the TP 50 control panel for intuitive device operation