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Magnetoinductive flow meter and measuring tube for such a flow meter

A technology of measuring tubes and magnetic induction, applied in the field of measuring tubes, can solve the problems of expensive, measuring voltage dependence, uneven formation, etc.

Inactive Publication Date: 2010-06-09
ENDRESS HAUSER FLOWTEC AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] A major disadvantage of such measuring transducers with metallic support tubes is that, on the one hand, considerable technical skill is required to be able to form and guide the magnetic field with the required measuring accuracy
On the other hand, support tubes using non-ferromagnetic materials, (such as using paramagnetic stainless steel), are very expensive, which will lead to a considerable cost factor in the production of the above-mentioned measuring transducers
Further, a disadvantage of conventional magnetic field systems is that, as figure 1 As shown, the magnetic field is formed inhomogeneously in the measuring tube lumen, therefore, the measuring voltage depends significantly on the flow pattern of the fluid in the measuring tube

Method used

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  • Magnetoinductive flow meter and measuring tube for such a flow meter
  • Magnetoinductive flow meter and measuring tube for such a flow meter
  • Magnetoinductive flow meter and measuring tube for such a flow meter

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Embodiment Construction

[0039] figure 2 and image 3 The schematic illustrates an example of a flow meter. At least one physically measured variable of the electrically conductive and flowing fluid 11 , such as a volume flow, is determined by means of the flow meter. The flow meter comprises a magnetic-inductive measuring transmitter 1 and connected thereto a measuring and operating circuit 8 for activating the measuring transmitter and producing a measured value, in particular a digital measured value, characterizing at least one fluid-describing parameter. For further calculation of measured values, the measuring and operating circuit 8 can also communicate with a higher-level process control computer 9 via a corresponding data transmission system 16 , for example by using a microcomputer 10 .

[0040] Belonging to the measuring transmitter 1 is a measuring tube 2 which is inserted into a pipe (not shown) carrying a liquid 11 . Measuring tube 2 comprises a measuring tube lumen surrounded by tub...

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Abstract

The invention provides that a measuring tube (2) for a magnetoinductive flow meter is produced at least proportionately from a magnetically conductive material whose relative permeability, [mu]r, is substantially greater than one. The measuring tube at least proportionately consists of a ferromagnetic metal.

Description

technical field [0001] The invention relates to a measuring tube for a magnetic induction flowmeter and a magnetic induction flowmeter with such a measuring tube. Background technique [0002] For the measurement of electrically conductive fluids, a flow meter with a magnetically inductive measuring transducer is often used. It is known to use magnetic induction flowmeters to measure the volume flow of especially electrically conductive fluids, especially liquids, and to generate corresponding measured values. As is known, the measuring principle of the magnetic induction flowmeter is that the voltage induced in the volume of the flowing fluid part cut by the magnetic field due to the separation of the charge carriers is detected by means of at least two measuring electrodes and in the measuring instrument electronics of the flowmeter are further processed into corresponding measured values, for example measured values ​​of volume flow. Likewise, the structure of the indiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/58
CPCG01F1/58G01F1/586
Inventor 托马斯·青格西蒙·斯廷格林
Owner ENDRESS HAUSER FLOWTEC AG
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