Hach Lange Gmbh

Hartmut Dräger

Michael Kussmann

Manfred Battefeld

Frank Steinhauer

Axel Leyer

Sebastian Goertz

Andreas Golitz

Aurelia Stellmach-Hanulok

Silke Brubaker

Michael Küppers

Kathrin Otte

Nina Aleth

A flow velocity measurement arrangement () for determining the flow velocity of an electrically conductive liquid in a liquid line, comprising an air bubble injector () for injecting an air bubble into a liquid flow, a first electrical conductivity measurement cell () downstream of the air bubble injector () and upstream of a measurement line (), a second electrical conductivity measurement cell (') downstream of the measurement line (), an evaluation unit () which determines the flow velocity of the liquid in the measurement line () on the basis of the time-related characteristics of the conductivity measurement results of the two measurement cells (′).

Flow velocity measurement arrangement

The present invention relates to a water sampling immersion probe () for continuously filtering a water sample from wastewater (). The water sampling immersion probe () includes a distal coarse filter () with a porosity of 0.1 to 1.0 mm, a proximal fine filter () arranged downstream of the coarse filter () and having a porosity of less than 5.0 μm, and a sample suction opening () arranged downstream of the fine filter (). The coarse filter () is arranged to not contact the fine filter ().

Water sampling immersion probe

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Berlin, Germany

Hartmut Dräger