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

A process variable and medium technology, applied in the direction of measuring device, test/calibration device, liquid/fluid solid measurement, etc., can solve the problem of generating protection or reference signal

Active Publication Date: 2011-09-28
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
  • 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 , monitor the level of the medium 1 inside the container 2. The medium 1 is preferably an electrically conductive liquid. It can also be used in non-conductive media. The measuring instrument consists of an electronics unit 8 and a probe unit 5 . In a practical construction, the probe unit 5 is preferably installed in the wall of the container 2 in such a way that the wall is directly closed to it. The container 2 can also be, for example, a pipe through which the medium 1 flows; the container thus refers to that type of construction 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 ground, which in particular generates an alternating voltage signal which is sent to the sensor electrode 6 as a control sig...

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PUM

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Abstract

The invention relates to an apparatus for determining and / or monitoring at least one process variable for a medium (1), having at least one evaluation unit (15) which monitors and / or signals when a prescribable limit value for the process variable is exceeded and / or undershot by the medium (1), and having at least one memory unit (17) which stores limit values for the process variable which are associated with at least one property of the medium (1), and wherein the evaluation unit (15) takes a statement about the property of the medium (1) as a basis for using the stored limit value which is associated with the property of the medium (1) from the memory unit (17) to determine and / or monitor the process variable.

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 fill level of a medium by detecting whether there is contact between a probe electrode and the wall of an electrically conductive container or a second electrode via the medium. Since deposits can form on the probe unit in many media, so-called guard or reference electrodes are used which are at the same potential as the probe electrodes and which surround the probe electrodes (see eg DE 32 12 434 C2). Depending on the nature of the deposits, however, it is difficult to properly generate a guard or reference signal. Contents of the invention [0003] It is therefore the object of the present invention to provide a measuring instrument which largely avoids insensitivity to deposits. [0004] This ob...

Claims

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Application Information

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