초록 ▼

In a level measuring device for electrically non-conductive liquids comprising a sensor which is positioned in a vessel and is in contact with the liquid, and further comprising an evaluation circuit connected to this sensor both compensation of a changing dielectric constant and a high degree of ac

In a level measuring device for electrically non-conductive liquids comprising a sensor which is positioned in a vessel and is in contact with the liquid, and further comprising an evaluation circuit connected to this sensor both compensation of a changing dielectric constant and a high degree of accuracy and resolution are achieved by placing a driver electrode 5 in the lower part of the vessel 1 at a position essentually coaxial to the sensor electrode 3, 4, and by placing a compensating electrode 6 between the driver electrode 5 and the wall 8 of the vessel 1, such that further capacitors are formed between the two electrodes 5 and 6 themselves as well as between them and the sensor electrode 3, 4 and between them and the wall 8 of the vessel 1.

대표청구항 ▼

A level measuring device to measure the level of an electrically non-conductive liquid in a vessel comprising a sensor electrode which is coaxially positioned in said vessel and is partly immersed in said non-conductive liquid, forming together with the wall of said vessel a capacitor that is connec

A level measuring device to measure the level of an electrically non-conductive liquid in a vessel comprising a sensor electrode which is coaxially positioned in said vessel and is partly immersed in said non-conductive liquid, forming together with the wall of said vessel a capacitor that is connected to an evaluation circuit measuring the capacitance of said capacitor, said capacitance providing a measure for said liquid level in said vessel to be determined, taking into account a compensating electrode also located in said vessel, wherein a driver electrode is placed in the lower area of said vessel at a position essentially coaxial to said sensor electrode, and wherein said compensating electrode is positioned between said driver electrode and said wall of said vessel, the two electrodes constituting further capacitors in conjunction with each other, and with said sensor electrode, and with said wall of said vessel.