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Impedance threshold level sensor

A sensor and material level technology, which is applied to the liquid level indicator, instrument, liquid level indicator and other directions of physical variable measurement, and can solve the problem that the resonance point cannot be clearly formed.

Pending Publication Date: 2020-12-04
VEGA GRIESHABER GMBH & CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This effect is particularly pronounced for non-metallic measuring vessels; in this case, during the transition from the measuring point (first contact with the medium, curve 300) to the housing (contact between the medium and the reference electrode, curve 302) , the resonance point cannot be clearly formed

Method used

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Embodiment Construction

[0043] Unless otherwise stated, the same reference numerals in the figures refer to the same components with the same function.

[0044] To simplify the drawings, in Figure 4 to Figure 6 The electronics unit 101 and the signal processing unit 105 are not shown. However, as with prior art, they are included in all exemplary embodiments.

[0045] Figure 4 A first exemplary embodiment of an impedance point level sensor 100 according to the present application is shown. In the exemplary embodiment shown, the impedance point level sensor 100 is shown in a simplified cross-sectional view, as used in the prior art.

[0046] according to Figure 4 The impedance sensor 100 has a measuring probe 102, which in the exemplary embodiment is formed by a measuring electrode 106 oriented in the axial direction A and rotationally symmetrical and a reference electrode 108 also oriented in the axial direction A and rotationally symmetric, A measurement capacitor 110 and a discrete inductor...

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Abstract

The invention relates to an impedance threshold level sensor (100), comprising: a measuring probe (102) which can be influenced by a medium surrounding the measuring probe (102) in a measuring capacitance (110), the measuring probe (102) comprising a measurement electrode (106) and a reference electrode (108) insulated from the measurement electrode (106), between which the measuring capacitance (110) is formed; a measuring resonant circuit, in which the measuring probe (102) is arranged as a capacitance-determining element, an electronic unit (101) having a signal generator (103) for excitingthe measuring resonant circuit and a signal detector (104) for determining a response signal of the measuring resonant circuit; a signal processing unit (105) for generating a measurement signal, which is connected to the electronic unit (101), wherein the measurement electrode (106) and the reference electrode (108) are designed and arranged in such a way that an increasing filling level of themedium reaches the reference electrode (108) earlier than the measurement electrode (106) or simultaneously.

Description

technical field [0001] The invention relates to an impedance point level sensor according to the preamble of claim 1 . Background technique [0002] Resistive point level sensors, for example for measuring point or fill levels, are basically known in the prior art. Typical applications for sensing predefined fill levels are process vessels, eg process tanks, storage tanks, silos or pipelines etc. in the process industry. Impedance point level sensors are often used as limit switches, i.e. to determine whether the filling medium is above or below a certain filling level (i.e. point level) in different liquids and in granular and powdered bulk materials . [0003] Other types of limit switches and point level sensors are also known, which are selected according to the field of use, process conditions and properties of the filling medium. In addition to resistive point level sensors, sensors operating according to the TDR (Time Domain Reflectometry) principle, vibrating poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
CPCG01F23/265G01F23/266G01F23/268
Inventor 克里斯蒂安·温齐尔勒于尔根·哈斯
Owner VEGA GRIESHABER GMBH & CO
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