Viscometer
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United States of America Patent
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Jun 28, 2011
Issued Date -
N/A
app pub date -
Mar 17, 2009
filing date -
Aug 24, 2001
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Abstract
The viscometer provides a viscosity value (X.sub..eta.) which represents the viscosity of a fluid flowing in a pipe connected thereto. It comprises a vibratory transducer with at least one flow tube for conducting the fluid, which communicates with the pipe. Driven by an excitation assembly, the flow tube is vibrated so that friction forces are produced in the fluid. The viscometer further includes meter electronics which feed an excitation current (i.sub.exc) into the excitation assembly. By means of the meter electronics, a first internal intermediate value (X.sub.1) is formed, which corresponds with the excitation current (i.sub.exc) and thus represents the friction forces acting in the fluid. According to the invention, a second internal intermediate value (X.sub.2), representing inhomogeneities in the fluid, is generated in the meter electronics, which then determine the viscosity value (X.sub..eta.) using the two intermediate values (X.sub.1, X.sub.2). The first internal intermediate value (X.sub.1) is preferably normalized by means of an amplitude control signal (y.sub.AM) for the excitation current (i.sub.exc), the amplitude control signal corresponding with the vibrations of the flow tube. As a result, the viscosity value (X.sub..eta.) provided by the viscometer is highly accurate and robust, particularly independently of the position of installation of the flow tube.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- ENDRESS + HAUSER FLOWTEC AG
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Drahm, Wolfgang | Erding, DE | 94 | 839 |
Rieder, Alfred | Landshut, DE | 135 | 878 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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