WO2008080412A1 - Electromagnetic flowmeter with elevated electrode - Google Patents

Electromagnetic flowmeter with elevated electrode Download PDF

Info

Publication number
WO2008080412A1
WO2008080412A1 PCT/EE2007/000018 EE2007000018W WO2008080412A1 WO 2008080412 A1 WO2008080412 A1 WO 2008080412A1 EE 2007000018 W EE2007000018 W EE 2007000018W WO 2008080412 A1 WO2008080412 A1 WO 2008080412A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring tube
electrode
electromagnetic flowmeter
wall
distance piece
Prior art date
Application number
PCT/EE2007/000018
Other languages
French (fr)
Inventor
Lembo MÄSS
Original Assignee
As Aswega
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by As Aswega filed Critical As Aswega
Publication of WO2008080412A1 publication Critical patent/WO2008080412A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor

Definitions

  • the electrode device of the electromagnetic flowmeter can be used in instrument engineering, specifically in the manufacturing of electromagnetic flowmeters.
  • the known operating principle of the electromagnetic flowmeter is that an electromotive force, which is expressed by electric voltage (hereinafter referred to as the flow signal) on the electrodes in the wall of the measuring tube, is created by electromagnetic induction in a fluid that flows inside a measuring tube located in a magnetic field.
  • the flow signal electric voltage
  • the electrode surface in contact with the flowing fluid flowing inside the measuring tube (hereinafter referred to as the electrode head) is located on the internal wall of the measuring tube (hereinafter referred to as the wall of the measuring tube) (GB2047409, GB2298716, DE3843667, DE4437374, GB2232257, EP0608793, EE 2000 00266 Ul, G01F1/58).
  • a residue on the wall of the measuring tube or the wear of the wall of the measuring tube will result in changes in the smoothness of the surface of the measuring tube and respective changes in the laminar flow profile of the fluid flowing at low speeds inside the measuring tube in the vicinity of the wall of the measuring tube, where also the electrode head is located.
  • Such changes in the flow profile will result in changes in the flow signal and decrease of the accuracy of the electromagnetic flowmeter, so much the more because of the fact that changes in the flow profile in the vicinity of the electrode head will influence the flow signal to a greater extent than equal changes in the flow profile further away.
  • the aim of this solution is to improve the electrode device of the electromagnetic flowmeter, in order to decrease changes in the flow signal, caused by changes in the flow profile resulting from a residue on the wall of the measuring tube of the electromagnetic flowmeter or the wear of the wall of the measuring tube, and to maintain the accuracy of the electromagnetic flowmeter at low speeds of the fluid measured in the long run.
  • the electrode head in the electrode device of the electromagnetic flowmeter is located at a distance from the wall of the measuring tube.
  • a distance piece 3 consisting of one or several parts is located between the head of the electrode 1 and the wall of the measuring tube 2.
  • the distance piece 3 consisting of one or several parts (hereinafter referred to as the distance piece) is taken to mean a bush of insulating material, a bush together with a washer or washers of insulating material, a washer or washers of insulating material, a wall boss of insulating material of the measuring tube 2.
  • a functional height of the distance piece 3 is 0.10-0.15 of the diameter of the measuring tube 2 (Fig. 2).
  • the distance piece 3, the height of which is 0.10-0.15 of the diameter of the measuring tube 2 will secure the location of the head of the electrode 1 in an area, where at low speeds the flow profile is virtually not influenced by changes in the smoothness of the wall of the measuring tube 2 and vortexes near the wall caused by that.
  • the location of the head of the electrode 1 at a distance from the wall of the measuring tube 2 will ensure greater stability of the flow signal and the maintenance of the accuracy of the electromagnetic flowmeter at low speeds in the long run.
  • the distance piece 3 is cylindrical, conical, elliptical, or square in shape.
  • Fig. 1 shows a general view of the electrode device of the electromagnetic flowmeter.
  • Fig. 2 shows a general view of the measuring tube of the electromagnetic flowmeter.
  • Fig. 1 shows a general view of the electrode device of the electromagnetic flowmeter, which includes an electrode 1, a measuring tube 2 and a distance piece 3 in the form of a bush of insulating material.
  • Fig. 2 shows a general view of the measuring tube of the electromagnetic flowmeter, which includes the measuring tube 2, electrodes 1 and distance pieces 3 in the form of bushes of insulating material.
  • the head of the electrode 1 is located at a distance from the wall of the measuring tube 2 by 75 means of the distance piece 3.
  • a bush of insulating material serves as the distance piece 3.
  • the height of the distance piece 3 is selected so that the head of the electrode 1 is located at a distance of 0.1 of the diameter of the measuring tube from the wall of the measuring tube 2.
  • the bush of insulating material 85 serving as the distance piece 3 is conical in shape.
  • the electrode device of the electromagnetic flowmeter the head of the electrode 1 of which is located at a distance from the wall of the measuring tube 2 by means of the distance piece 3, the height of which is 0.10-0.15 of the diameter of the measuring tube 2, will render it possible to obtain a 90 more stable flow signal at low flow rates, irrespective of changes in the smoothness of the wall of the measuring tube 2, thus rendering it possible to maintain the accuracy of the electromagnetic flowmeter at low flow rates in the long run.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The electrode device of the electromagnetic flowmeter (Fig. 1) includes a distance piece (3) with a height of 0.10-0.15 of the diameter of the measuring tube (2), located between the head of the electrode (1) and the wall of the measuring tube (2). The distance piece (3) is conical, cylindrical, elliptical, or square in shape, and consists of one or several parts.

Description

ELECTROMAGNETIC FLOWMETER WITH ELEVATED
ELECTRODE
Technical field of the invention
The electrode device of the electromagnetic flowmeter can be used in instrument engineering, specifically in the manufacturing of electromagnetic flowmeters.
State of the art
The known operating principle of the electromagnetic flowmeter is that an electromotive force, which is expressed by electric voltage (hereinafter referred to as the flow signal) on the electrodes in the wall of the measuring tube, is created by electromagnetic induction in a fluid that flows inside a measuring tube located in a magnetic field.
In case of the known electrode device of the electromagnetic flowmeter, the electrode surface in contact with the flowing fluid flowing inside the measuring tube (hereinafter referred to as the electrode head) is located on the internal wall of the measuring tube (hereinafter referred to as the wall of the measuring tube) (GB2047409, GB2298716, DE3843667, DE4437374, GB2232257, EP0608793, EE 2000 00266 Ul, G01F1/58).
A residue on the wall of the measuring tube or the wear of the wall of the measuring tube will result in changes in the smoothness of the surface of the measuring tube and respective changes in the laminar flow profile of the fluid flowing at low speeds inside the measuring tube in the vicinity of the wall of the measuring tube, where also the electrode head is located. Such changes in the flow profile will result in changes in the flow signal and decrease of the accuracy of the electromagnetic flowmeter, so much the more because of the fact that changes in the flow profile in the vicinity of the electrode head will influence the flow signal to a greater extent than equal changes in the flow profile further away.
Subject matter of the invention
The aim of this solution is to improve the electrode device of the electromagnetic flowmeter, in order to decrease changes in the flow signal, caused by changes in the flow profile resulting from a residue on the wall of the measuring tube of the electromagnetic flowmeter or the wear of the wall of the measuring tube, and to maintain the accuracy of the electromagnetic flowmeter at low speeds of the fluid measured in the long run.
To reach this aim, the electrode head in the electrode device of the electromagnetic flowmeter is located at a distance from the wall of the measuring tube.
In the electrode device of the electromagnetic flowmeter (Fig. 1), a distance piece 3 consisting of one or several parts is located between the head of the electrode 1 and the wall of the measuring tube 2. The distance piece 3 consisting of one or several parts (hereinafter referred to as the distance piece) is taken to mean a bush of insulating material, a bush together with a washer or washers of insulating material, a washer or washers of insulating material, a wall boss of insulating material of the measuring tube 2.
A functional height of the distance piece 3 is 0.10-0.15 of the diameter of the measuring tube 2 (Fig. 2). The distance piece 3, the height of which is 0.10-0.15 of the diameter of the measuring tube 2, will secure the location of the head of the electrode 1 in an area, where at low speeds the flow profile is virtually not influenced by changes in the smoothness of the wall of the measuring tube 2 and vortexes near the wall caused by that.
The location of the head of the electrode 1 at a distance from the wall of the measuring tube 2 will ensure greater stability of the flow signal and the maintenance of the accuracy of the electromagnetic flowmeter at low speeds in the long run.
The distance piece 3 is cylindrical, conical, elliptical, or square in shape.
List of illustrations
The invention is described by the following example with reference to the added figures.
Fig. 1 shows a general view of the electrode device of the electromagnetic flowmeter. Fig. 2 shows a general view of the measuring tube of the electromagnetic flowmeter.
Fig. 1 shows a general view of the electrode device of the electromagnetic flowmeter, which includes an electrode 1, a measuring tube 2 and a distance piece 3 in the form of a bush of insulating material.
Fig. 2 shows a general view of the measuring tube of the electromagnetic flowmeter, which includes the measuring tube 2, electrodes 1 and distance pieces 3 in the form of bushes of insulating material. Example of executing the invention
In the electrode device of the electromagnetic flowmeter, the head of the electrode 1 is located at a distance from the wall of the measuring tube 2 by 75 means of the distance piece 3. A bush of insulating material serves as the distance piece 3.
The height of the distance piece 3 is selected so that the head of the electrode 1 is located at a distance of 0.1 of the diameter of the measuring tube from the wall of the measuring tube 2.
80 There is no actual need for a distance piece 3 higher than 15 mm, and a distance piece 3 lower than 2.5 mm will not ensure the required distance of the head of the electrode 1 from the wall of the measuring tube 2.
In order to avoid entanglement of possible solid particles found in the fluid to be measured with the distance piece 3, the bush of insulating material 85 serving as the distance piece 3 is conical in shape.
The electrode device of the electromagnetic flowmeter, the head of the electrode 1 of which is located at a distance from the wall of the measuring tube 2 by means of the distance piece 3, the height of which is 0.10-0.15 of the diameter of the measuring tube 2, will render it possible to obtain a 90 more stable flow signal at low flow rates, irrespective of changes in the smoothness of the wall of the measuring tube 2, thus rendering it possible to maintain the accuracy of the electromagnetic flowmeter at low flow rates in the long run.

Claims

Claims of the invention
95 1. The electrode device of the electromagnetic flowmeter, comprising of a measuring tube (2) and an electrode (1) in the wall of the measuring tube (2), is distinguished by the fact that between the head of the electrode (1), consisting of the surface of the electrode (1) in contact with the fluid flowing inside the measuring tube (2), and the wall of the measuring tube 100 (2) it contains a distance piece (3) with a height of 0.10-0.15 of the diameter of the measuring tube (2).
2. The electrode device of the electromagnetic flowmeter according to Clause 1, which is distinguished by the fact that the distance piece (3) is conical, cylindrical, elliptical or square in shape.
105 3. The electrode device of the electromagnetic flowmeter according to Clause 1 and Clause 2, which is distinguished by the fact that the distance piece (3) is a bush of insulating material, a bush with a washer or washers of insulating material, a washer or washers of insulating material performing analogous functions, a wall boss of insulating material of the
110 measuring tube (2) performing analogous functions.
PCT/EE2007/000018 2006-12-28 2007-10-02 Electromagnetic flowmeter with elevated electrode WO2008080412A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EEP200600043A EE05165B1 (en) 2006-12-28 2006-12-28 Electromagnetic wear electrode device
EEP200600043 2006-12-28

Publications (1)

Publication Number Publication Date
WO2008080412A1 true WO2008080412A1 (en) 2008-07-10

Family

ID=38941840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EE2007/000018 WO2008080412A1 (en) 2006-12-28 2007-10-02 Electromagnetic flowmeter with elevated electrode

Country Status (2)

Country Link
EE (1) EE05165B1 (en)
WO (1) WO2008080412A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987728A (en) * 2015-02-17 2016-10-05 艾默生过程控制流量技术有限公司 Electromagnetic flowmeter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0608793A2 (en) * 1993-01-27 1994-08-03 TURBO-WERK Messtechnik GmbH Electric flowmeter
EP1666849A1 (en) * 2004-12-02 2006-06-07 Krohne AG Electro-magnetic flowmeter and method for its manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0608793A2 (en) * 1993-01-27 1994-08-03 TURBO-WERK Messtechnik GmbH Electric flowmeter
EP1666849A1 (en) * 2004-12-02 2006-06-07 Krohne AG Electro-magnetic flowmeter and method for its manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987728A (en) * 2015-02-17 2016-10-05 艾默生过程控制流量技术有限公司 Electromagnetic flowmeter

Also Published As

Publication number Publication date
EE200600043A (en) 2008-08-15
EE05165B1 (en) 2009-04-15

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