US3633401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for checking electromagnetic flowmeters
Assignee: Toshiba Corp
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Filing: 1970-07-02
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Granted: 1972-01-11
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Expires: 1990-07-02
Abstract
Abstract A device for checking electromagnetic flowmeters includes a flat duct having a rectangular section which is made of an electrical insulating material. The flat duct has a pair of electrode which extend in a widthwise direction through the opposite sidewalls thereof. When it is desired to check the electromagnetic flowmeter, the flat duct is inserted into a tubular duct of the electromagnetic flowmeter such that the pair of electrodes of the former are positioned along a diameter of the latter. A small amount of liquid is then passed through the flat duct. Exciting means are provided for generating a magnetic flux around the tubular duct of the electromagnetic flowmeter to be checked. The magnetic flux generated passes through the liquid flowing through the flat duct in a direction perpendicular to a line extending between the pair of electrodes. In accordance with the liquid flow, an electromotive force is generated and the same may be measured to indicate the approval or rejection of the electromagnetic flowmeter.
Inventors
- 👤 Ichiro Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:59
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F25/00; G01F25/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
A method of checking an electromagnetic flowmeter for the approval thereof comprising the steps of: positioning a flat-shaped duct made of an electrical insulator and having a substantially rectangular cross section within a tubular duct of the electromagnetic flowmeter, said cross section of the flat-shaped duct being smaller than that of the electromagnetic flowmeter and said flat-shaped duct being coincident with a diameter of said tubular duct in a widthwise direction thereof and extending through said tubular duct in the lengthwise direction thereof, flowing the same fluid which is to be passed through said tubular duct through said flat-shaped duct, passing magnetic fluxes which are generated from an exciting coil device mounted around said tubular duct through said flatshaped duct in a direction perpendicular to the flow within said flat-shaped duct, receiving an electromotive force induced in said fluid flowing through said flat duct and corresponding to the flow between a pair of electrodes which respectively extend in a widthwise direction through the opposite sidewalls of said flat-shaped duct, and, measuring the amplitude of said electromotive force.
Claim 2
Independent Claim
177 words
A method of checking an electromagnetic flowmeter for the approval thereof comprising the steps of: positioning a flat-shaped duct made of an electrical insulator and having a substantially rectangular cross section within a tubular duct of the electromagnetic flowmeter, said cross section of the flat-shaped duct being smaller than that of the electromagnetic flowmeter and said flat-shaped duct being coincident with a diameter of said tubular duct in a widthwise direction thereof and extending through said tubular duct in the lengthwise direction thereof, flowing the same fluid which is to be passed through said tubular duct through said flat-shaped duct, passing magnetic fluxes which are generated from an exciting coil device mounted around said tubular duct through said flatshaped duct in a direction perpendicular to the flow within said flat-shaped duct, receiving an electromotive force induced in said fluid flowing through said flat duct and corresponding to the flow between a pair of electrodes which respectively extend in a widthwise direction through the opposite sidewalls of said flat-shaped duct, and, measuring the amplitude of said electromotive force.
Claim 3
Independent Claim
196 words
An apparatus for checking an electromagnetic flowmeter for the approval thereof comprising: a flat-shaped duct having a substantially rectangular section which is smaller than a cross section of a tubular duct of said electromagnetic flowmeter, said flat-shaped duct being positioned within said tubular duct and having a width which is nearly equal to a diameter of said tubular duct and a length which extends substantially lengthwise through said tubular duct; a pair of electrodes arranged to extend in a widthwise direction through the opposite sidewalls of said flat-shaped duct and being positioned along a diameter thereof; said flat-shaped duct being mounted within said tubular duct so as to allow magnetic fluxes to pass therethrough, said magnetic fluxes being generated from an exciting coil device mounted around the external surface of said tubular duct and passing through a liquid flowing within the flat duct such that the path of the magnetic fluxes is perpendicular to both a line connected between said pair of electrodes and the direction of said liquid flow; and a device for measuring an electromotive force generated and received by said pair of electrodes in accordance with the liquid flow in said flat duct.
Claim 4
Independent Claim
196 words
An apparatus for checking an electromagnetic flowmeter for the approval thereof comprising: a flat-shaped duct having a substantially rectangular section which is smaller than a cross section of a tubular duct of said electromagnetic flowmeter, said flat-shaped duct being positioned within said tubular duct and having a width which is nearly equal to a diameter of said tubular duct and a length which extends substantially lengthwise through said tubular duct; a pair of electrodes arranged to extend in a widthwise direction through the opposite sidewalls of said flat-shaped duct and being positioned along a diameter thereof; said flat-shaped duct being mounted within said tubular duct so as to allow magnetic fluxes to pass therethrough, said magnetic fluxes being generated from an exciting coil device mounted around the external surface of said tubular duct and passing through a liquid flowing within the flat duct such that the path of the magnetic fluxes is perpendicular to both a line connected between said pair of electrodes and the direction of said liquid flow; and a device for measuring an electromotive force generated and received by said pair of electrodes in accordance with the liquid flow in said flat duct.
Claim 5
Dependent Claim
26 words
An apparatus for checking an electromagnetic flowmeter for the approval thereof according to claim 2, wherein: said flat-shaped duct is made of an electrical insulating material.
Claim 6
Dependent Claim
51 words
An apparatus for checking an electromagnetic flowmeter for the approval thereof according to claim 2, wherein: said flat-shaped duct includes magnetic members provided on an inner surface of said flat-shaped duct with the exception of a center area which is adjacent to the area wherein said pair of electrodes are positioned.
Claim 7
Dependent Claim
36 words
An apparatus for checking an electromagnetic flowmeter for the approval thereof according to claim 4, wherein: said magnetic shield members are arranged so as to be connected to ground upon the checking of said electromagnetic flowmeter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |