Apparatus for measuring the electrical conductivity of a liquid medium
First Claim
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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Accused Products
Abstract
Device for measuring electrical conductivity of a liquid medium comprising constant voltage means, connected to a first electrode arrangement for injecting an alternating signal into the liquid medium, detection means, connected to a second electrode arrangement coupled via the liquid medium, for generating a measurement signal influenced by the electrical conductivity with a clock frequency (CLK) of the alternating signal, and evaluation means which from a current-proportional injection signal of the current injected by the first electrode arrangement into the liquid medium and from the measurement signal generate a conductivity signal of the liquid medium. The constant voltage means are made in an individual circuit branch which has commutator means for the first electrode arrangement and ohmic resistance means in a series connection, the current-proportional injection signal being tapped as a voltage drop over the resistance means.
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Citations
32 Claims
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1. A device for measuring an electrical conductivity of a liquid medium, comprising:
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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, and evaluation 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, and wherein the current-proportional injection signal is tapped as a voltage drop over a resistor of the ohmic resistance means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32)
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14. A method for measuring an electrical conductivity of a liquid medium, comprising:
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injecting an alternating signal into the liquid medium, wherein the alternating signal is injected by constant voltage means electrically connected to a first electrode arrangement, generating a measurement signal influenced by the electrical conductivity of the liquid medium, wherein the measurement signal has a clock frequency of the alternating signal, the measurement signal generated by a detection means electrically connected to a second electrode arrangement, said detection means physically separated from the first electrode arrangement and electrically coupled to the first electrode arrangement via the liquid medium, and generating a conductivity signal of the liquid medium, wherein the conductivity signal is generated by evaluation means from (i) a current-proportional injection signal of current infected by the first electrode arrangement into the liquid medium and (ii) the measurement signal, and providing the conductivity signal for further electronic processing, wherein the constant voltage means is located in a circuit branch having a commutator for the first electrode arrangement and ohmic resistance means in a series connection, wherein the current-proportional injection signal is tapped as a voltage drop over the ohmic resistance means, and wherein the conductivity signal of the liquid medium has an uninterrupted range of conductivity between 0.001 mS/em and 1000 mS/cm. - View Dependent Claims (30, 31)
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Specification