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Sensor device for potentiometric measurement of liquid levels in containers

A sensor device, a technology of potentiometric measurement, which is applied to the liquid level indicator, liquid level indicator, measuring device and other directions of physical variable measurement, which can solve the problems of inaccurate measurement and increased error.

Active Publication Date: 2020-12-15
宝盟电气股份公司
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Problems solved by technology

[0004] However, it is disadvantageous that the oscillating device generating the alternating voltage has a certain parasitic capacitance with respect to the electrode arrangement and with respect to the environment and, due to the asymmetry that is always present in practice, overcouples the common-mode part of the alternating voltage into the measurement voltage
In the measurement of fillings with a small permittivity and thus a small capacitance, the measurement is very inaccurate, since the parasitic capacitance of the oscillating device becomes comparable to the capacitance of the filling, and errors are therefore especially in the case of liquid level drops very strongly increased when
In addition, parasitic capacitances, e.g. caused by shielding measures, act on the measurement signal in a burdensome manner

Method used

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  • Sensor device for potentiometric measurement of liquid levels in containers
  • Sensor device for potentiometric measurement of liquid levels in containers

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Embodiment Construction

[0036] exist figure 1 An embodiment of a sensor device 1 for potentiometric measurement of a filling level 2 in a container 3 is shown in . To this end, an alternating voltage is generated between the upper or proximal end 46 and the lower or distal end 45 of the electrode 4 by an oscillating device 5 comprising an alternator 51 not shown in more detail and a transformer device 52 not shown in more detail.

[0037] The electrodes 4 protrude into the container 3 and are immersed in a filling, which here is, for example, a liquid. Fill level 2 can be determined here by comparing the voltage drop between lower electrode potential 27 and upper electrode potential 28 with the voltage between lower electrode potential 27 and container 3 and evaluating the processing result. Since these voltages are small, amplifiers 12 and 10 are used in order to preprocess them (for example with a microprocessor with ADC) for subsequent evaluation circuits.

[0038] The problem here is that the s...

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Abstract

A sensor array for a potentiometric measurement of a fill level in a container. The sensor array includes an electro-magnetically shielding array whose potential is dependent on a potential of the container, and an oscillator array which generates an AC voltage. The oscillator array is at least partly arranged in the electro-magnetically shielding array.

Description

technical field [0001] The invention relates to a sensor device for potentiometric measurement of liquid levels in containers. Background technique [0002] Such sensor devices have been known for a long time and are used, for example, to measure container volumes in the chemical or food industry. With such a measuring principle, the ratio between the voltage between one electrode terminal and the container wall or the counter electrode and the voltage fed between the two electrode terminals is measured. A prerequisite for this is at least a low electrical conductivity of the filling. [0003] If operating with an alternating voltage of sufficiently high frequency, the potentiometric measuring method can also be realized purely physically by means of the dielectric properties of the filling, ie by means of its capacitive effect. [0004] However, it is disadvantageous that the oscillating device generating the alternating voltage has a certain parasitic capacitance relativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/24G01F23/22
CPCG01F23/22G01F23/24G01F23/263G01N27/301
Inventor D·布伦德勒P·芬德
Owner 宝盟电气股份公司
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