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Field device and method for calibrating a field device

A technique for field devices, electronic circuits, used in test/calibration devices, devices with stored calibration coefficients, level indicators for the measurement of physical variables, etc.

Inactive Publication Date: 2007-05-16
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, microprocessors are only used to linearize, scale, and provide time delay, switching hysteresis, or inversion to a signal prepared with analog electronics

Method used

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  • Field device and method for calibrating a field device
  • Field device and method for calibrating a field device
  • Field device and method for calibrating a field device

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] As can be seen from FIG. 1 , the field device 1 comprises a field device electronics 2 and a sensor unit 5 for determining and / or monitoring the fill level of a medium in a container (not shown), wherein the sensor unit 5 is implemented, for example, as a conductive or capacitive probes. The field device electronics 2 comprises a microprocessor 3, an evaluation unit 4, a signal generating unit 6, a storage unit 7, a digital adjustment element 11 and a switching element 9, wherein the actuating element 8 is actuated contactlessly from outside the housing 14 of the field device electronics Switching element 9. In the illustrated embodiment, the housing 14 is hermetically sealed, the contactless actuation takes place by changing the magnetic field, the switching element 9 is eg a reed relay or a Hall sensor, and the associated actuating element 8 is a permanent magnet. In the exemplary embodiment shown, the interface 9.1 is provided such that a certain distance from the s...

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PUM

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Abstract

The invention relates to a field device (1) and a method for calibrating a field device (1), comprising an electronic system (2) and a sensor unit (5) for the process measurements. The electronic system (2) of said field device receives measuring signals of the sensor unit (5), and comprises an evaluation unit (4) for evaluating said measuring signals, and means for calibrating the field device (1). According to the invention, the means for calibrating the field device (1) comprise a digital regulating element (11) and a microprocessor (3), said digital regulating element (11) being controlled by the microprocessor (3) for the calibration of the field device (1).

Description

technical field [0001] The invention relates to a field device with a field device electronics and a sensor unit for process measurement, and to a method for calibrating the field device. Background technique [0002] In the case of field devices with field device electronics and assigned conductive or capacitive sensor units, the calibration of the sensitivity of the field device must be carried out in the case of extreme field conditions using potentiometers, wherein in particular the potentiometers are used to adjust the analysis electronics switching threshold. The direction in which the switching threshold changes depends on whether the field device is operating in a "MIN" type of operation as a pump-down protection, i.e. an alarm when a predetermined level is lowered, or in a "MAX" operation type as an overfill protection, i.e. Alarm when predetermined material level. Calibration is then usually performed when the indicated sensor state does not correspond to the act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/26G01D18/00G01F23/24G01F1/00G01F25/00G08C17/00
CPCG01F23/26G01F23/266G01D18/008G01F25/0061G01F25/20
Inventor 亚历山大·米勒
Owner EHNDRESS KHAUZER GMBKH KO KG