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page 6
2
Introduction
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Dear KRÜSS GmbH Customer,
Thank you for purchasing the BP50 from KRÜSS.
Thanks to the simple handling of the unit, you will soon be carrying out your
measurements without any problems. However, we advise you to read this
documentation carefully before starting work and to follow the appropriate
information when installing the unit. As well as the instructions for use, you will also
find helpful information and tips, for example for the optimum preparation of a
measurement.
!
We strongly advise you not to carry out the installation and work without
consulting this manual.
This manual is subject to a permanent quality control. The current version of the
manual can always be acquired from the download section of our homepage
www.kruss.de.
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2.1
Possible uses of the BP50
The BP50 together with the software LabDesk gives you the following options:
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Measurement of dynamic surface tension as a function of surface age
Time-dependent measurement of dynamic surface tension at constant surface
age
Single measurement at constant surface age with quality evaluation of the
results in colour
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2.2
Measuring principle
Gas bubbles are produced in the liquid sample by means of a capillary which is
connected to a pressure sensor. To increase the size of such a bubble the pressure
must work against the surface tension of the liquid. The surface tension of the
liquid can be calculated from the maximum bubble pressure when the bubble is
formed.
The time from the beginning of the formation of the bubble to the time that the
maximum pressure is detected is the age of the surface. In the case of the BP50,
this surface age can be specified over a wide measuring range.
You will find further information on the measuring principle and the theory
behind the bubble pressure method in the LabDesk software manual.
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Introduction
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