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Apparatus for measuring the electrical conductivity of a liquid medium

  • US 9,354,193 B2
  • Filed: 06/26/2012
  • Issued: 05/31/2016
  • Est. Priority Date: 07/20/2011
  • Status: Active Grant
First Claim
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1. A device for measuring an electrical conductivity of a liquid medium, comprising:

  • constant voltage means for injecting an alternating signal into the liquid medium, the constant voltage means electrically connected to a first electrode arrangement,detection means for generating a measurement signal influenced by the electrical conductivity of the liquid medium, the measurement signal having a clock frequency of the alternating signal, wherein the detection means is electrically connected to a second electrode arrangement, which is physically separated from the first electrode arrangement and which is electrically coupled to the first electrode arrangement via the liquid medium, andevaluation means for generating an output signal from (i) a current-proportional injection signal of current injected by the first electrode arrangement into the liquid medium and (ii) the measurement signal, said output signal provided for further electronic processing,wherein the constant voltage means is located in a circuit branch having a first commutator for the first electrode arrangement and ohmic resistance means for providing a source of ohmic resistance, the first commutator and the ohmic resistance means connected in series with the constant voltage means, andwherein the current-proportional injection signal is tapped as a voltage drop over a resistor of the ohmic resistance means.

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