Bubble pressure tensiometer MBP 200

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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 - - the MBP 200 can be fitted with both reusable glass capillaries and disposable capillaries. - - the MBP 200 can measure high differential pressures up to over 3400 Pascal, which enables the analysis of highly viscous liquids. - - the temperature of the sample vessel can be set between -15 °C and 135 °C with the help of various optional temperature control units. - - 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.