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Capacitive fill level sensor

A filling level, capacitive technology, applied in the direction of instruments, liquid level indicators, liquid level indicators for physical variable measurement, etc., to achieve the effect of cheap manufacturing and delivery

Active Publication Date: 2015-12-16
BALLUFF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By including electrical grounding, previously known methods can only be used in immersion probes with a grounded metal housing, where the measuring electrodes must always be arranged close to the metal housing area

Method used

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Embodiment Construction

[0049] figure 1 A capacitive fill-level sensor 10 according to the invention is shown, which is cut in the vertical direction in the region of the electrode unit 12 . The capacitive fill level sensor 10 measures the fill level H1 , H2 of a medium 16 which is located in the container 14 within the fill level measuring range H. FIG. In the exemplary embodiment shown, the medium 16 has a first fill level H1. A possible second fill level H2 is also shown.

[0050] The electrode unit 12 is adhered to the outer wall 20 of the container 14 by means of an adhesive layer 18 . Due to the partially cut out depiction, the measuring electrode 22 , the counter electrode 24 , the first shielding electrode 26 and the second shielding electrode 28 are visible. The electrode unit 12 is connected to a first electronics unit 30 which is arranged at the lower end of the container 14 in the exemplary embodiment shown. An output signal 36 is provided via the line 32 which is in contact with the ...

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Abstract

The invention relates to a capacitive fill level sensor (10) for measuring the fill level (H1, H2; H1', H2') of a medium (18) in a container (14), having an electrode unit (12), which contains a strip-shaped measurement electrode (22), a strip-shaped counter electrode (24) and a strip-shaped shielding electrode (26, 28, 40), the shielding electrode (26, 28, 40) at least partially surrounding the measurement electrode (22). The capacitive fill level sensor (10) according to the invention is characterized in that a first AC voltage source (60) having a predefined frequency and amplitude is provided, to which the shielding electrode (26, 28, 40) is connected such that a shielding capacitor (54, 56, 58) formed between the shielding electrode (26, 28, 40) and the measurement electrode (22) has a shielding capacitance that is proportional to the length of the shielding electrode (26, 28, 40), that a second AC voltage source (68) of equal frequency and a predefined second amplitude is provided, the second amplitude being in phase opposition to the first amplitude, to which AC voltage source the counter electrode (24) is connected, such that a measurement capacitor (52) formed between the counter electrode (24) and the measurement electrode (22) has a measurement capacitance that is proportional to the fill level (H1, H2; H1', H2'), and that the measurement electrode voltage (72) present at the measurement electrode (22) is used to determine the fill level (H1, H2; H1', H2').

Description

technical field [0001] The invention is based on a continuous capacitive fill level sensor having an electrode unit according to the general part of the independent claim. Background technique [0002] Capacitive fill level sensors are used to measure the fill level of fluid media or solid materials. In the case of capacitive fill level sensors for measuring the fill level, a measuring impedance is developed, the resistive component of which, but especially the capacitive component of the measuring impedance reflects a measure of the fill level. [0003] In a simple embodiment of the electrode unit, a measuring electrode is provided, which is positioned electrically insulated on the outer wall of the container or in the immersion probe adjacent to the counter electrode. [0004] In published patent application DE 10 2009 017 011 A1 a capacitive fill level sensor is described which is able to measure the fill level of a medium inside a container. The capacitive sensor has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
CPCG01F23/266G01F23/268G01F23/263
Inventor 弗兰克·温肯斯于尔根·格洛克
Owner BALLUFF
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