WO2006002914A2 - Messstoffberührende elektrode sowie verfahren zur herstellung derselben - Google Patents
Messstoffberührende elektrode sowie verfahren zur herstellung derselben Download PDFInfo
- Publication number
- WO2006002914A2 WO2006002914A2 PCT/EP2005/007047 EP2005007047W WO2006002914A2 WO 2006002914 A2 WO2006002914 A2 WO 2006002914A2 EP 2005007047 W EP2005007047 W EP 2005007047W WO 2006002914 A2 WO2006002914 A2 WO 2006002914A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- medium
- electrode
- base body
- contact
- wetted
- Prior art date
Links
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 present invention relates to a wetted electrode, in particular for measured value detection in a magneto-inductive flowmeter (IDM), which comes into contact with an abrasive or chemically aggressive medium. Furthermore, the invention relates to a magnetic-inductive flowmeter with such a measuring electrode and a method for producing the same.
- IDM magneto-inductive flowmeter
- volumetric flow measurements primarily the magnetic-inductive flowmeters of interest are used. These are used for continuous or pulsating flow measurement of conductive, homogeneous or multiphase media as well as for filling and dosing processes.
- IDM's core applications include many applications in the paper and pulp industry, from water and stock preparation to additive dosing, and the like.
- the measuring principle of magnetic-inductive flowmeters is based on the law of induction. This physical effect is used to measure the flow velocity of the medium through the measuring tube. Because an electrically conductive medium is passed through a magnetic field B, arises in Medium an electric field E, which is aligned perpendicular to the flow velocity v and to the magnetic field direction. The following applies:
- the potential of the electric field E representing the flow velocity is usually measured via electrodes in contact with the measuring medium.
- a magneto-inductive flowmeter emerges, which is flanged into a pipeline. Through the pipe and the measuring tube of the electromagnetic flowmeter, the medium flows through.
- a measuring arrangement is provided around the measuring tube, in this case a magnet arrangement which is in galvanic connection with the flowing medium through electrodes passing through the wall of the measuring tube provided with a non-electrically conductive lining.
- the wetted electrode from an outer jacket electrode having a second fuse electrode disposed therein.
- the wetted electrode is Concretely designed as a thick-walled hollow body and inside a second, isolated from the wetted electrode electrode fuse electrode is placed. Leads now the abrasive attack on the measuring electrode over time to an actual removal of electrode material, so at the moment in which said hollow body-shaped outer sheath electrode is eroded, the medium activate the inner fuse electrode, which can be determined directly via a corresponding evaluation.
- the electrode itself must be made of a material that is as resistant as possible in order to achieve the longest possible service life when used in conjunction with abrasive or chemically aggressive media.
- the entire electrode head is usually made of platinum or other suitable precious metal.
- the invention includes the technical teaching that a wetted electrode is provided from a shape-determining base body of a non-resistant to the medium non-resistant metal whose surface is at least partially provided with a noble metal coating to improve the electrical conductivity, which makes the electrical contact to a surrounding the body and resistant to the medium resistant sheath body, which is in galvanic contact to the medium.
- the advantage of the solution according to the invention is in particular that the material costs can be significantly reduced overall by the simple material of the base body. Because the form-determining body consists of a common metal and serves only to determine the basic shape of the electrode and the electrical transmission of the measurement signal. On the other hand, the expensive, resistant material is only used for the thin sheath body exposed directly to the abrasive or chemically aggressive medium. The mechanical strength of the electrode can be ensured while reducing the cost of materials over a long time.
- the jacket body of the wetted electrode may consist of a metal sheet or a metal foil of noble metal, preferably selected from the group comprising the subgroup metals: platinum, gold, tantalum or alloys thereof. It is also conceivable-depending on the degree of the desired resistance or type of medium-to use other subgroup metals, such as: Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, or alloys thereof.
- the jacket body from an electrically conductive plastic film.
- plastic films are quite inexpensive and also have a sufficient resistance to abrasive or chemisch ⁇ aggressive media.
- the jacket body is applied by forming on the base body, so that the two connection partners an essentially positive
- the wetted electrode can be assembled in a particularly simple manner.
- the base body may consist of a conventional electrically conductive metal, such as copper, zinc, iron or alloys thereof, such as brass and the like.
- the noble metal coating applied thereto serves to improve the electrical contact between the base body and the jacket body.
- the noble metal coating should preferably consist of the same material as the sheath body, for example also of platinum, gold, tantalum or alloys thereof.
- the noble metal coating can be applied in a simple manner by electroplating or by vapor deposition. This makes it possible to achieve a material-saving low layer thickness with reliable adhesion to the base body.
- a further measure improving the invention consists in detecting, for monitoring the operation of the measuring electrode, the galvanic voltage generated by damage to the sheath body between the sheath body and the base body and signaling it by a downstream evaluation electronics. Because of the action of the abrasive or chemically aggressive medium on the surface of the sheath body this is damaged in the course of time. If the jacket body is broken, a galvanic element is produced on the electrode itself, the voltage of which can be correspondingly evaluated.
- FIG. 1 is a schematic perspective view of a magnetic-inductive flowmeter with two wetted electrodes and
- the magneto-inductive flowmeter (IDM) shown in FIG. 1 has a measuring tube 1 through which an electrically conductive medium whose volumetric flow is to be determined flows at the speed v.
- Two exciter coils 2 and 3 belonging to the magnet arrangement, which are arranged opposite one another on the outside of the measuring tube 1, are supplied with an alternating current or a pulsating direct current I, so that a magnetic field E is produced in the interior of the measuring tube 1.
- a tapping of the voltage thereby induced in the medium takes place at two electrodes 4 and 5 which are likewise arranged opposite each other and are insulated in the measuring tube 1.
- the inside of the measuring tube 1 facing side of both electrodes 4 and 5 are each in contact with an abrasive and / or chemical-aggressive medium, whereas the opposite side of the wetted electrodes 4 and 5 via an electrical line with a - not shown here - Transmitter are in communication.
- the measuring tube 1 has an inner part 6 made of plastic, which is surrounded by a metallic outer part 7.
- the inner part 6 has the function of isolating the metallic outer part 7 from the electrically conductive medium.
- the measuring electrode 4 shown here by way of example is fastened in an electrically insulated manner via its shape-determining basic body 8 on the inner part 6 of the measuring tube 1.
- the electrode 4 has a jacket body 10, which establishes contact with the medium 9.
- the sheath body 10 is made in this embodiment of platinum, a material that is quite resistant to chemically-aggressive media.
- the surface of the main body 8 is provided with a noble metal coating 11 in the vicinity of the specimen.
- the jacket body 10 is applied by forming on the base body 8, so that there is an essentially positive connection between the two parts.
- the noble metal coating 11 is here likewise designed in accordance with the material of the sheath body 10 of platinum, whereas the main body 8 itself in this embodiment Brass exists.
- the noble metal coating 11 is applied galvanically to the surface of the main body 8.
- the measuring electrode 4 is connected to an evaluation electronics 12, which serves to monitor the operation of the measuring electrode 4. Damage to the jacket body 10 is formed on the measuring electrode 4, a galvanic element whose galvanic voltage is detected and signaled by the downstream transmitter 12. The signal indicates that the electrode is damaged and needs to be replaced.
- the sheath body and the precious metal coating of the body is made of another precious metal, which is resistant to the respective abrasive and chemically aggressive medium.
- - at least the jacket body - is made of an electrically conductive plastic film.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,925 US20070189354A1 (en) | 2004-06-30 | 2005-06-30 | Electrode in contact with a substance to be measured, and method for the production thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004031642.2 | 2004-06-30 | ||
DE102004031642 | 2004-06-30 | ||
DE102005030713.2 | 2005-06-29 | ||
DE102005030713A DE102005030713A1 (de) | 2004-06-30 | 2005-06-29 | Messstoffberührende Elektrode sowie Verfahren zur Herstellung derselben |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2006002914A2 true WO2006002914A2 (de) | 2006-01-12 |
WO2006002914A3 WO2006002914A3 (de) | 2006-04-20 |
Family
ID=35457698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/007047 WO2006002914A2 (de) | 2004-06-30 | 2005-06-30 | Messstoffberührende elektrode sowie verfahren zur herstellung derselben |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070189354A1 (de) |
DE (1) | DE102005030713A1 (de) |
WO (1) | WO2006002914A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007003614A1 (de) * | 2006-07-26 | 2008-01-31 | Endress + Hauser Flowtec Ag | Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung |
CA2771291A1 (en) * | 2009-08-14 | 2011-02-17 | Paul Lott | Pipeline inspection apparatus and method |
US10502599B2 (en) * | 2016-03-31 | 2019-12-10 | Rosemount Inc. | Polymeric magnetic flowmeter flow body assembly |
DE102018203726A1 (de) | 2018-03-13 | 2019-09-19 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Herstellung eines Sandwichbauteils |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565619A (en) * | 1983-02-18 | 1986-01-21 | The Foxboro Company | Composite electrode structure |
US4782709A (en) * | 1985-08-19 | 1988-11-08 | Yamatake-Honeywell Co., Ltd. | Electromagnetic flowmeter |
WO1998055837A1 (en) * | 1997-06-02 | 1998-12-10 | Danfoss A/S | Electromagnetic flow meter |
DE10128607A1 (de) * | 2001-06-13 | 2003-01-09 | Abb Patent Gmbh | Meßstoffberührte Elektrode |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4388834A (en) * | 1981-03-31 | 1983-06-21 | Fischer & Porter Company | Electromagnetic flowmeter having a monolithic conduit |
US4517846A (en) * | 1983-06-13 | 1985-05-21 | Flowmetering Instruments Limited | Electromagnetic flowmeter |
US4912838A (en) * | 1987-12-25 | 1990-04-03 | Yamatake-Honeywell Co., Ltd. | Method of manufacturing electrode for electromagnetic flowmeter |
US5247837A (en) * | 1991-09-25 | 1993-09-28 | Rosemount Inc. | Magnetic flowmeter electrode |
GB2324606B (en) * | 1997-04-25 | 2002-01-16 | Kent Meters Ltd | Electromagnetic flowmeter |
GB2333161B (en) * | 1997-12-24 | 2002-06-12 | Abb Kent Taylor Ltd | Electrode integrity checking |
US6611775B1 (en) * | 1998-12-10 | 2003-08-26 | Rosemount Inc. | Electrode leakage diagnostics in a magnetic flow meter |
-
2005
- 2005-06-29 DE DE102005030713A patent/DE102005030713A1/de not_active Withdrawn
- 2005-06-30 WO PCT/EP2005/007047 patent/WO2006002914A2/de active Application Filing
- 2005-06-30 US US11/630,925 patent/US20070189354A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565619A (en) * | 1983-02-18 | 1986-01-21 | The Foxboro Company | Composite electrode structure |
US4782709A (en) * | 1985-08-19 | 1988-11-08 | Yamatake-Honeywell Co., Ltd. | Electromagnetic flowmeter |
WO1998055837A1 (en) * | 1997-06-02 | 1998-12-10 | Danfoss A/S | Electromagnetic flow meter |
DE10128607A1 (de) * | 2001-06-13 | 2003-01-09 | Abb Patent Gmbh | Meßstoffberührte Elektrode |
Also Published As
Publication number | Publication date |
---|---|
US20070189354A1 (en) | 2007-08-16 |
DE102005030713A1 (de) | 2006-01-26 |
WO2006002914A3 (de) | 2006-04-20 |
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