Measuring transducer for process instrumentation, and method for monitoring the condition of the sensor thereof

A technology for measuring transducers and process instruments, which is applied in the field of measuring transducers and can solve problems such as measurement signal changes and measurement value errors.

Inactive Publication Date: 2011-04-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changes in the sensor material, e.g. due to chemical contamination, can lead to changes in the measurement signal and thus to errors in the measured value

Method used

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  • Measuring transducer for process instrumentation, and method for monitoring the condition of the sensor thereof
  • Measuring transducer for process instrumentation, and method for monitoring the condition of the sensor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The single figure shows the basic electrical structure of a measuring transducer 1 which is used in a process instrumentation installation and which can be connected to a fieldbus 2 for communication with a superordinate control station in a process technology installation. communication. On the one hand, the measuring transducer 1 can be provided with its operating parameters, such as the address on the fieldbus 2 or the display mode of the measured value, for the measuring transducer 1 through the fieldbus 2; information or status information.

[0013] The sensor 3 is used to detect a physical or chemical parameter, in the exemplary embodiment shown, to detect pressure. The rest of measuring transducer 1 has the function of a control and evaluation unit, the core of which is formed by A / D converter 4 and microcontroller 5 . The control and evaluation unit determines a measured value of the physical or chemical parameter depending on the measurement signal MS, which ...

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PUM

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Abstract

The invention relates to a measuring transducer for process instrumentation, comprising a sensor for sensing a physical or chemical variable. The sensor has at least one electrical element which is embedded in a substrate made of semiconducting material and is electrically separated therefrom by means of a blocked PN junction (DS) during normal operation. In order to monitor the condition of the sensor (3), the PN junction (DS) is connected in the conducting direction in a test mode, and the electrical property of the PN junction, in particular the forward voltage, is determined and is used for monitoring the condition. In addition, a temperature sensor (TS) mounted on the sensor (3) can be monitored by determining, on the basis of the dependence of the forward voltage on the temperature, a comparative value for the temperature sensed by the temperature sensor (TS). If major differences occur, it can be concluded that there is a failure of the sensor (3), and a corresponding error message can be output via a field bus (2).

Description

technical field [0001] The invention relates to a measuring transducer for a process instrumentation installation according to the preamble of claim 1 , which has a sensor for detecting a physical or chemical parameter, and to a measuring transducer according to claim 1 The method for monitoring the state of a sensor as described in the preamble of claim 5. Background technique [0002] In process technology installations, a wide variety of field devices for process instrumentation systems are used for process control. Measuring transducers are used to detect process variables such as temperature, pressure, flow, level, density or gas concentration of a medium. By means of the controller, the process can be influenced depending on the detected process variable in accordance with a strategy, for example specified by the control station. Examples of regulators include regulating valves, heating devices or pumps. [0003] DE 693 09 123 T2 discloses a sensor for a pressure tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00
CPCG01L19/04G01D11/245G01D18/00G01L27/007G01L27/00G01D3/0365G01L9/065G01D2218/10
Inventor 埃里克·谢米斯凯托马斯·埃斯尔特德尔菲娜·默尼尔罗宾·普马尼克马丁·施帕茨
Owner SIEMENS AG
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