# US 10,371,554 B2 · Coriolis mass flowmeter and method for operating a Coriolis mass flowmeter

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- Number: US 10,371,554 B2
- Document ID: US10371554B2
- Status: Granted
- Kind: B2
- Application number: 15/713,866
- Filed: 2017-09-25
- Published: 2018-03-29
- Granted: 2019-08-06
- Earliest claimed: 2016-09-23
- Assignees: Krohne AG
- Applicants: Krohne AG
- Inventors: Christopher Rolph; Trevor Fawcett
- Web page: https://patentgrep.com/patent/US10371554B2

## CPC

- G01F 1/8495: {with multiple measuring conduits}
- G01F 1/8409: {constructional details}
- G01F 1/8413: {means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments}
- G01F 1/8477: {with multiple measuring conduits}
- G01F 5/00: Measuring a proportion of the volume flow
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME

## Abstract

A Coriolis mass flowmeter with a flange connection for connection to an external pipeline, with at least one oscillation generator, with at least two oscillation sensors, with at least two measuring tubes, with at least one flow divider, wherein the flow divider is arranged upstream of the at least two measuring tubes in the direction of flow, and with at least one flow collector, wherein the flow collector is arranged downstream of the at least two measuring tubes. The Coriolis mass flowmeter has at least an active measuring tube and at least a passive measuring tube being provided, the at least one active measuring tube and the at least one passive measuring tube are designed and arranged separately from one another and the at least one oscillation generator and the at least two oscillation sensors are arranged on the at least one active measuring tube.

## Claims

### Claim 1

Coriolis mass flowmeter, comprising:
a flange connection for connection to an external pipeline,
at least one oscillation generator, with at least two oscillation sensors,
at least two measuring tubes,
at least one flow divide arranged upstream of the at least two measuring tubes in a direction of flow, and
at least one flow collector arranged downstream of the at least two measuring tubes,
wherein said at least two measuring tubes comprise at least an active measuring tube and at least a passive measuring tube,
wherein the at least one active measuring tube and the at least one passive measuring tube are arranged separately from one another and
wherein the at least one oscillation generator and the at least two oscillation sensors are arranged on the at least one active measuring tube.

### Claim 2 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube and the at least one passive measuring tube have the same length.

### Claim 3 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the number of active measuring tubes is the same as the number of passive measuring tubes.

### Claim 4 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the number of passive measuring tubes corresponds to an integer multiple of the number of active measuring tubes.

### Claim 5 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube and the at least one passive measuring tube each have a cross-sectional surface area, and wherein the cross-sectional surface area of the passive measuring tube is identical to a cross-sectional surface area of the at least one active measuring tube.

### Claim 6 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube and the at least one passive measuring tube each have a cross section surface area, and wherein the cross-sectional surface area of the passive measuring tube is different from the cross-sectional surface area of the active measuring tube.

### Claim 7 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube comprises a plurality of active measuring tubes, wherein the at least one passive measuring tube comprises a plurality of passive measuring tubes, wherein each active measuring tube and each passive measuring tube has a cross-sectional surface area, wherein the sum of the cross-sectional surface areas of the plurality of active measuring tube defines a first overall cross-sectional area and wherein the sum of the cross-sectional surface areas of the plurality of passive measuring tubes defines a second overall cross-sectional area, and wherein the second overall cross-sectional area corresponds to an integer multiple of the first overall cross-sectional area.

### Claim 8 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube and the at least one passive measuring tube each have a cross-sectional surface area, wherein the cross-sectional surface area of at least one of the active measuring tube and the passive measuring tube is one of circular, oval, triangular, rectangular, circle segment, or circle sector shaped.

### Claim 9 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube and the at least one passive measuring tube are curved in a U-shape.

### Claim 10 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein the at least one active measuring tube is curved a U-shape, and the at least one passive measuring tube is straight.

### Claim 11 (depends on 1)

Coriolis mass flowmeter according to claim 1, wherein at least two passive measuring tubes are provided and wherein at least one flow merger is provided by which the at least two passive measuring tubes are merged into one passive measuring tube.