Device and method for carrying out a contactless measurement of the conductivity of a liquid situated in a flow channel
AssigneeFresenius Medical Care Deutschland GmbH
InventorsFranz-Wilhelm Koerdt, Peter Kaiser, Hans Georg Hülsmann
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Abstract
The invention relates to a device and method for carrying out a contactless measurement of the conductivity of a liquid situated in a flow channel, and to the use of said device and method. According to the invention, the invention provides that a toroidal coil is precisely arranged around the flow channel. Said toroidal coil is interconnected with a capacitor to an oscillating circuit. The invention also provides that the electric characteristics of this circuit are then measured according to the conductivity which is sought after.
Claims15
A device for contact-free measurement of the conductivity of a liquid in a flow channel, comprising:
- only one toroidal coil, wherein the toroidal coil is adapted to be arranged around the flow channel;
- and
- an analyzer circuit connected to the toroidal coil;
- wherein neither the toroidal coil nor the analyzer circuit contacts the liquid in the flow channel.
A method of performing contact-free conductivity measurement of a liquid in a flow channel, comprising the steps of:
- disposing only one toroidal coil around the flow channel;
- connecting an analyzer circuit to the toroidal coil;
- measuring electric properties of the toroidal coil;
- and
- calculating the conductivity from the measured electric properties with the analyzer circuit;
- wherein the method is performed without the use of an electrode.
Dependencies are inferred from the claim text.