Verfahren und Vorrichtung zur Bestimmung der Konzentration von oberflaechenaktiven Substanzen in einer Fluessigkeit

EP 1162446 A UPAB: 20020508 NOVELTY - The method involves feeding the liquid to a container with a capillary for drop formation. A constant inner container volume is only partly filled with liquid and closed air tight so an increasing pressure difference builds up between the constant inner volume and the exterior when drops occur. The number of drops per time interval or the time for a given number of drops is measured and compared with reference values to derive the concentration. DETAILED DESCRIPTION - The method involves feeding the liquid to a container (1) with a capillary (2) for drop formation at an outlet (4) in its bottom region. A constant inner volume of the container is only partly filled with liquid (3) and is closed air tight so that an increasing pressure difference builds up between the constant inner volume and the exterior when drops occur. The number of drops per time interval or the time for a given number of drops is measured and compared with reference values to determine the concentration. An INDEPENDENT CLAIM is also included for an arrangement for determining the concentration of surface active substances in a liquid and a use of device for automatic real-time concentration monitoring of cleaners, e.g. in cleaning and degreasing baths. USE - For determining the concentration of surface-active substances in a liquid. ADVANTAGE - Enables simple and inexpensive concentration determination or monitoring