Apparatus for determining and/or monitoring a process variable
First Claim
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1. An apparatus for capacitive determining and/or monitoring at least one process variable of a medium in a container, comprising:
- at least one probe unit; and
at least one electronics unit, which supplies said at least one probe unit with an electrical, exciter signal and which receives from said at least one probe unit an electrical, measurement signal, wherein;
said probe unit has at least one inner electrode and at least one outer electrode surrounding the inner electrode;
said at least one inner electrode and said at least one outer electrode are insulated electrically relative to one another and relative to the medium;
said at least one electronics unit is embodied in such a manner that it supplies said at least one inner electrode and said at least one outer electrode alternately with the exciter signal, and that it receives and evaluates the measurement signals associated with the individual supplyings of said at least one inner electrode and at least one said outer electrode.
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Abstract
An apparatus for determining and/or monitoring at least one process variable of a medium. The apparatus includes at least one probe unit and at least one electronics unit, which supplies the probe unit with an electrical, exciter signal and which receives from the probe unit an electrical, measurement signal. The invention includes, that the probe unit has at least one inner electrode and at least one outer electrode surrounding the inner electrode.
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Citations
10 Claims
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1. An apparatus for capacitive determining and/or monitoring at least one process variable of a medium in a container, comprising:
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at least one probe unit; and at least one electronics unit, which supplies said at least one probe unit with an electrical, exciter signal and which receives from said at least one probe unit an electrical, measurement signal, wherein; said probe unit has at least one inner electrode and at least one outer electrode surrounding the inner electrode; said at least one inner electrode and said at least one outer electrode are insulated electrically relative to one another and relative to the medium; said at least one electronics unit is embodied in such a manner that it supplies said at least one inner electrode and said at least one outer electrode alternately with the exciter signal, and that it receives and evaluates the measurement signals associated with the individual supplyings of said at least one inner electrode and at least one said outer electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for measuring at least one process variable of a medium in a container, comprising:
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at least one probe unit; and at least one electronics unit, which supplies said at least one probe unit with an exciter signal and which receives from said at least one probe unit a measurement signal, wherein; said probe unit has at least one inner electrode and at least two outer electrodes surrounding the inner electrode, wherein said at least two outer electrodes are tubular; said at least one inner electrode and said at least two outer electrodes are insulated electrically relative to the medium; said at least one electronics unit is embodied in such a manner that it supplies said at least one inner electrode and said at least two outer electrodes alternately with the exciter signal; and the measurement signal is tapped from the electrode supplied with the exciter signal.
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Specification