| 摘要 |
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. |
| 主权项 |
1. A 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, which is separated from the first electrode arrangement and which is coupled via the liquid medium, said detection means generating a measurement signal (U(U)) influenced by the electrical conductivity with a clock frequency (CLK) of the alternating signal, and evaluation means, which from a current-proportional injection signal (U(I)) of the current injected by the first electrode arrangement into the liquid medium and from the measurement signal (U(U)), generate an output signal, and make it available for further electronic processing,wherein
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, and the current-proportional injection signal (U(I)) being tapped as a voltage drop over the resistance means.
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