GB1111981A - Improvements in flow meters - Google Patents
Improvements in flow metersInfo
- Publication number
- GB1111981A GB1111981A GB1921365A GB1921365A GB1111981A GB 1111981 A GB1111981 A GB 1111981A GB 1921365 A GB1921365 A GB 1921365A GB 1921365 A GB1921365 A GB 1921365A GB 1111981 A GB1111981 A GB 1111981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lining
- potentials
- electrodes
- rings
- gain
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
1,111,981. Fluid-flow meters, electrical. SOC D'INSTRUMENTATION SCHLUMBERGER. March 6, 1965, No. 19213/65. Heading G1N. Relates to the elimination of short circuiting of potentials induced in a flowing liquid in the region of the pick-up electrodes of an induction type fluid-flow meter having a flow channel lined with non-magnetic metal. The meter comprises a non-magnetic pipe 10 (Fig. 2) with a stainless steel lining 16 separated therefrom by plastics insulating material 22 except where it is fixed to the pipe flanges 12, 14. Diametrically opposed pick-up electrodes 52, 56, insulated from the lining 16 by surrounds 54, 58 are disposed on a diameter perpendicular to the direction of a magnetic field produced by a permanent or electromagnetic (preferably A. C., not shown). Surrounding each electrode is a pair of concentric copper guard rings 60, 64 and 62, 66, which are brazed to the lining 16. A third electrode 68 is electrically connected to the lining to act as a reference potential point. The electrodes are connected to the inputs of differential amplifiers 70, 72 (Fig. 3) the outputs of which are connected to the guard rings. If for instance the gain of amplifier 70 is zero then the metal lining 16 constitutes an electrical connection between points in the liquid where different potentials exist. This alters the potentials particularly where the electrical conductivity of the liquid is low. If the gain is increased progressively from zero to unity currents are induced in the lining which produce potentials, in the region of the rings, identical to those which would be found if the lining was insulating. The potential of the rings will become equal to the potential of the associated electrode when the amplifier gain is unity. The outputs of the amplifiers are also connected to a mV meter to indicate the flow rate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR973655A FR1403065A (en) | 1964-05-06 | 1964-05-06 | Improvement in electromagnetic flowmeters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1111981A true GB1111981A (en) | 1968-05-01 |
Family
ID=8829501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1921365A Expired GB1111981A (en) | 1964-05-06 | 1965-05-06 | Improvements in flow meters |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1403065A (en) |
GB (1) | GB1111981A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4137767A (en) * | 1977-09-13 | 1979-02-06 | Honeywell, Inc. | Electromagnetic flow meter |
US4181013A (en) * | 1976-07-23 | 1980-01-01 | Honeywell Inc. | Electrodes for an electromagnetic flow meter |
US4269071A (en) * | 1977-09-13 | 1981-05-26 | Honeywell Inc. | Electrodes for an electromagnetic flow meter |
US4290312A (en) * | 1979-01-26 | 1981-09-22 | Hokushin Electric Works, Ltd. | Signal generator for electromagnetic flowmeter |
US4419899A (en) * | 1981-04-28 | 1983-12-13 | Tokyo Shibaura Denki Kabushiki Kaisha | Electromagnetic flow meter |
EP0764831A1 (en) * | 1995-09-22 | 1997-03-26 | Endress + Hauser Flowtec AG | Method of manufacturing a measuring tube for an electro-magnetic flow sensor |
-
1964
- 1964-05-06 FR FR973655A patent/FR1403065A/en not_active Expired
-
1965
- 1965-05-06 GB GB1921365A patent/GB1111981A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4181013A (en) * | 1976-07-23 | 1980-01-01 | Honeywell Inc. | Electrodes for an electromagnetic flow meter |
US4137767A (en) * | 1977-09-13 | 1979-02-06 | Honeywell, Inc. | Electromagnetic flow meter |
US4269071A (en) * | 1977-09-13 | 1981-05-26 | Honeywell Inc. | Electrodes for an electromagnetic flow meter |
US4290312A (en) * | 1979-01-26 | 1981-09-22 | Hokushin Electric Works, Ltd. | Signal generator for electromagnetic flowmeter |
US4419899A (en) * | 1981-04-28 | 1983-12-13 | Tokyo Shibaura Denki Kabushiki Kaisha | Electromagnetic flow meter |
EP0764831A1 (en) * | 1995-09-22 | 1997-03-26 | Endress + Hauser Flowtec AG | Method of manufacturing a measuring tube for an electro-magnetic flow sensor |
US5664315A (en) * | 1995-09-22 | 1997-09-09 | Endress + Hauser Flowtec Ag | Process for manufacturing a measuring tube of an electromagnetic flow sensor |
Also Published As
Publication number | Publication date |
---|---|
FR1403065A (en) | 1965-06-18 |
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