USO0RE36376E

United States Patent [19]

[11] E

Cage et al.

[45] Reissued Date of Patent:

[54]

STABILITY CORIOLIS MASS FLOW METER

[75]

Inventors: Donald R. Cage, Longmont; James R.

US' PATENT DOCUMENTS 4,491,025

1/1985 Smith et al. .

4,768,385

9/1988 Cage .

4,823,613

4/1989 Cage et al. ......................... .. 73/861.38

Assignee; Micro Motion, Inc” Boulder, Cob

[87]

References Cited

both of Boulder, all of Colo.

Appl NO .

[22] [86]

Nov. 9, 1999

4,422,338 12/1983 Smith .

[21]

09A10 015

..

.

[56]

Re. 36,376

Ruesch; Timothy J. Cunningham, [73]

.

Patent Number:

FOREIGN PATENT DOCUMENTS

,

_

PCT Flled' PCT NO;

Jun‘ 8’ 1990 PCT/US90/03284

§ 371 Date:

Jan. 16, 1992

O 212 782

3/1987

European Pat. Off. .

0 250 706 1337668A1

1/1988 9/1987

U.S.S.R. .

8706691

11/1987

European Pat. Off. . WIPO .

OTHER PUBLICATIONS

§ 102(6) Date? Jan- 16, 1992

PP. Kremlevsky, Flowmeters and Quantity Meters, 1989,

PCT Pub. NO.Z W090/15310

PP~ 348_351~ Primary Examiner—Max H. Noori

PCT Pub. Date: Dec. 12, 1990 Related US. Patent Documents

Reissue of:

[64] iitlfélézNo"

Assistant Examiner—Harshad Patel Attorney, Agent, or Firm—Thomas S. Hahn

[57]

ABSTRACT

232115257199 4

An optimized Coriolis mass ?oW meter is disclosed Which

AppL NO‘,

07/820,848

has improved stability to excitations caused by external

Filed:

Jun_ 8’ 1990

in?uences. Aprimary source of improvement‘ involves deter

U'S Applications,

mining by modal analysis of the How conduit a location for

[

the sensor means that minimizes the in?uence of external excitation of one or more of the ?rst in phase bending mode,

[63] Continuation-in-part of application No. 07/364,032, Jun. 9,

the_ ?rst out of phase bending mode> the ?rst out of phase

[51]

1989, abandoned, Int. c1.6 ...................................................... .. G01F 1/84

tWist mode, the second out of phase tWist mode, the second out of phase bending mode and the third out of phase

[52]

US. Cl. ....................................................... .. 73/861355

[58]

Field of Search ...................... .. 73/861355, 861.356

bending mode.

10 Claims, 29 Drawing Sheets

U.S. Patent

Nov. 9, 1999

Sheet 1 0f 29

FIG. IA

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U.S. Patent

Nov. 9, 1999

Sheet 2 0f 29

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U.S. Patent

Nov. 9, 1999

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Sheet 3 0f 29

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U.S. Patent

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Sheet 6 0f 29

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TIME

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U.S. Patent

Nov. 9, 1999

Sheet 7 0f 29

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U.S. Patent

Nov. 9, 1999

Sheet 8 0f 29

Re. 36,376

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U.S. Patent

Nov. 9, 1999

Sheet 9 0f 29

Re. 36,376

TIME

FIG.

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U.S. Patent

Nov. 9, 1999

Sheet 11 0f 29

Re. 36,376

U.S. Patent

N0v.9, 1999

Sheet 12 0f 29

Re. 36,376

21086 0

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U.S. Patent

N0v.9, 1999

Sheet 13 0f 29

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U.S. Patent

N0v.9, 1999

Sheet 15 0f 29

Re. 36,376

x MEASURED DENSITY DRIFT (9/60) x MEASURED FLOW DRIFT (usec) o MEASURED DENSITY STD 05v (g,cc)

o MEASURED DENSITY STD DEV (usec)

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200 400 600 800 1000 1200 1400 1600 1800 2000

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U.S. Patent

N0v.9, 1999

Sheet 16 0f 29

Re. 36,376

124068 0

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400 1

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U.S. Patent

N0v.9, 1999

Sheet 17 0f 29

Re. 36,376

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U.S. Patent

N0v.9, 1999

Sheet 18 0f 29

Re. 36,376

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U.S. Patent

N0v.9, 1999

Sheet 19 0f 29

Re. 36,376

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//BFIG.

United States Patent [19] [11] E Patent Number: Re. 36,376

Jan 16, 1992 - Primary Examiner—Max H. Noori. Assistant Examiner—Harshad Patel. Attorney, Agent, or Firm—Thomas S. Hahn. PCT Pub. Date: Dec.
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