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US 2006/0219002 A1Published application
Method for capacitive measurement of fill level
AssigneeEndress + Hauser GmbH + Co. KG
InventorHans-Jörg Florenz
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Abstract
In a method for the capacitive fill level measurement of a fill substance in a container, electrical current is determined at two alternating voltage signals U1, U2 of differing frequencies f1, f2. On the basis of the two values for current, the capacitive reactance and therewith the fill height h of the fill substance can be easily determined. Influences of ohmic resistance on the measurement results are eliminated in this method.
Claims5
1-4. (canceled)
A method for capacitive fill level measurement of a fill substance in a container utilizing a measuring electrode and an evaluation circuit, comprising the steps of:
- producing a first alternating voltage signal U1 having a first frequency f1;
- determining the associated first amount of current I1;
- producing a second alternating voltage signal U2 having a second frequency f2;
- determining the associated second amount of current I2;
- determining the capacitive reactance from the two current values I1, I2 and the two frequency values f1, f2;
- and
- determining the fill height h of the fill substance from the reactance.
4 more elements
Dependencies are inferred from the claim text.