Apparatus for determining and/or monitoring a process variable for a medium

A medium and value-based technology, applied in the field of devices with at least one process variable, capable of solving problems such as generating protection or reference signals

Active Publication Date: 2014-03-19
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on the characteristics of the sediment, it is difficult to properly generate a guard or a reference signal

Method used

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  • Apparatus for determining and/or monitoring a process variable for a medium
  • Apparatus for determining and/or monitoring a process variable for a medium

Examples

Experimental program
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Embodiment Construction

[0016] exist figure 1 , the level of the medium 1 inside the container 2 is monitored. The medium 1 is preferably an electrically conductive liquid in this respect. It can also be used in non-conductive media. The measuring instrument consists of an electronic unit 8 and a probe unit 5 . In a practical configuration, the probe unit 5 is preferably mounted in the wall of the container 2 in such a way that the wall is directly closed therewith. The container 2 can also be, for example, a tube through which the medium 1 flows; the container therefore refers to that type of structure which at least sometimes receives the medium. The wall of the container 2 is formed here as a measuring electrode, ie it is electrically conductively connected to ground potential. Alternatively, the second electrode is fed into the container 2 . At the same time, a signal source 10 is connected to the ground, which in particular generates an alternating voltage signal which is sent to the sensor...

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Abstract

An apparatus for determining and / or monitoring at least one process variable of a medium. The apparatus includes: at least one evaluation unit, which monitors and / or signals an exceeding and / or subceeding of a predeterminable limit value of the process variable by the medium; and at least one memory unit, in which limit values of the process variable associated with at least one property of the medium are stored; and wherein the evaluation unit, based on information concerning the property of the medium, applies from the memory unit, for determining and / or monitoring the process variable, a stored limit value associated with the property of the medium.

Description

technical field [0001] The invention relates to a device for determining and / or monitoring at least one process variable of a medium. The process variable is, for example, the fill level. Background technique [0002] In the prior art, it is known, for example, to monitor the level of the medium by identifying whether there is contact between the probe electrode and the wall of the conductive container or the second electrode via the medium. Since deposits can occur on the probe unit in many media, a so-called guard or reference electrode is used, which is at the same potential as the probe electrode and surrounds the probe electrode (see eg DE 32 12 434 C2). However, depending on the characteristics of the precipitate, it is difficult to properly generate a guard or reference signal. SUMMARY OF THE INVENTION [0003] The object of the present invention is therefore to provide a measuring device that avoids insensitivity to deposits over a large area. [0004] This obje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/24G01F23/26G01F25/00H03K17/945
CPCG01F23/266G01F25/0061H03K17/955G01F23/244G01F23/241G01F23/265G01F25/20
Inventor 阿尔明·韦内特
Owner EHNDRESS KHAUZER GMBKH KO KG
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