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Method and corresponding device for in-situ calibration of analog measurement transmission paths

A technology of transmission path and mode, applied in the direction of test/calibration device, thermometer test/calibration, heat measurement, etc.

Active Publication Date: 2020-06-12
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This recalibration involves removal of the sensor and thus represents a considerable effort

Method used

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  • Method and corresponding device for in-situ calibration of analog measurement transmission paths
  • Method and corresponding device for in-situ calibration of analog measurement transmission paths
  • Method and corresponding device for in-situ calibration of analog measurement transmission paths

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Embodiment Construction

[0039] figure 1 Shown is the sensor 2 , the measurement transmission path 1 and the control unit 3 , as well as a schematic arrangement of the different sensor components. In this case, the sensor comprises at least one sensitive component 22 and a control / evaluation unit 21 . The signal direction of the analog electrical signal is routed from the control / evaluation unit 21 to the control unit 3 via the measurement transmission path 1 .

[0040] In a particularly preferred embodiment, the sensitive component 22 consists of a temperature sensor. The reference element 23 is used to calibrate the first temperature sensitive component 22 . Calibration of the sensor takes place at a fixed temperature point at which the reference element 23 undergoes a phase change. In this example of an embodiment, the subsequent simulation mode for calibrating the measurement transport path 1 can preferably be triggered by the fact that a fixed temperature point for calibrating the sensor 2 is ...

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Abstract

The invention relates to a method for the in-situ calibration of an analogue measurement transport path (1) in conjunction with determining and / or monitoring a process variable of a medium. An analog electrical signal is transmitted via said measurement transmission path (1) from a control / evaluation unit (21) associated with a sensor (2) using a pair of At least one component (22) sensitive to the process variable determines and / or monitors the process variable. The sensor (2) operates in a measurement mode or in a simulation mode. In the measurement mode, the control / evaluation unit (21) converts the measured value of at least one sensitive component (22) of the sensor (2) into an analog electrical signal representative of the process variable. In the simulation mode, the control / evaluation unit (21) outputs at least one analog electrical signal for a set time span, which is unambiguously identifiable as simulated and recognized by the control unit (3) and recording, and the measurement transmission path (1) is calibrated, wherein the control unit (3) determines between the analog electrical signal predetermined by the control / evaluation unit (21) and the recorded analog electrical signal deviation.

Description

technical field [0001] The invention relates to a method for the in-situ calibration of an analog measurement transmission path in conjunction with determining and / or monitoring a process variable of a medium, wherein analog electrical signals are transmitted from a control / evaluation unit to a control unit via the measurement transmission path. In this case, the control / evaluation unit is associated with the sensor. A sensor determines and / or monitors a process variable based on at least one component sensitive to the process variable. Process variables are, for example, temperature, density, viscosity, pressure, fill level, flow, chemical composition, temperature or analytical data such as pH, turbidity or conductivity of the medium. In various embodiments, corresponding sensors are manufactured and sold by E+H Corporation. The medium can be, for example, a liquid or a gas. Analog electrical signals are, for example, current, voltage or capacitance. [0002] Furthermore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00G01K15/00
CPCG01D18/006G01K15/005
Inventor 乌尔里希·海茨丹尼尔·科赫马克·施塔尔
Owner EHNDRESS KHAUZER GMBKH KO KG