Energy production device for producing and simultaneously monitoring measured current

A current generation and current measurement technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as failure of current limiting network components

Active Publication Date: 2010-08-18
VEGA GRIESHABER GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One cause of such a deviation could be, for example,

Method used

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  • Energy production device for producing and simultaneously monitoring measured current
  • Energy production device for producing and simultaneously monitoring measured current
  • Energy production device for producing and simultaneously monitoring measured current

Examples

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Embodiment Construction

[0059] figure 1 A current generating device 100 is shown for generating and simultaneously monitoring a measurement current 101 corresponding to a measurement value of a sensor 102 . The figure shows a first current source 103 generating a measurement current 101 . This current is the load-independent output current of the current source 103 . The figure also shows a second current source 104 feeding a test current 110 into the first circuit 109 . A compensation current 105 is generated due to the feeding. In other words, the second current source 104 also generates the compensation current 105 . In this case, the generated compensation current 105 compensates at least part of the measurement current 101 .

[0060] The figure also shows a detection circuit 106 , which in this case is implemented in the form of a voltage measurement performed by the microcontroller 113 at the first node 114 . The detection circuit 106 is designed to detect deviations of the value of the me...

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Abstract

The generation and monitoring of a load-independent output current for a level meter, pressure gauge, flowmeter or evaluation device are described. A current that is equal or unequal to the measuring current, but inverted relative thereto, can be generated continuously or within certain time intervals in a switching circuit that is realized independently of the network generating the measuring current. The generated current can be fed into the measuring circuit at a comparison point and added. The compensation principle makes it possible to determine whether the measuring current corresponds to the nominal value, wherein a testing current is fed into the first electric circuit by means of a second switching circuit that contains a second current source. A certain expectancy value of a voltage to be tapped can be calculated in dependence on the testing current being fed in and the nominal value. If the measured voltage deviates from the expectancy value, a deviation of the measuring current from the nominal value is detected and can be output for a user.

Description

[0001] References to related applications [0002] This application claims the benefit of the filing date of European Patent Application EP 09152814.1, filed 13 February 2009, the disclosure of which is hereby incorporated by reference, and this application claims filing date 13 February 2009 61 / 152,369, the disclosure of which is hereby incorporated by reference. technical field [0003] The invention relates to the generation and monitoring of electric current. The invention relates in particular to a current generating device for generating and simultaneously monitoring a measuring current of a level meter, a pressure meter or a flow meter, to a level meter with a current generating device, to a pressure meter with a current generating device, to a device with a current generating A flowmeter of a device, a method for generating and simultaneously monitoring a measurement current, a program element, and a computer-readable medium. Background technique [0004] Field dev...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01D3/06
Inventor 安德烈亚斯·布莱辛
Owner VEGA GRIESHABER GMBH & CO
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