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US 10,539,442 B2Granted
Fluid momentum detection method and related apparatus
AssigneeMicro Motion, Inc.
InventorJoel Weinstein
Life of this patent
Estimating the term…
Abstract
A method is provided for determining fluid momentum through one or more conduits. The method comprises the step of receiving an elongation signal from an elongation sensor indicating an elongation of the one or more conduits due to the flowing fluid. A momentum term is then calculated.
Claims14
A method for determining fluid momentum through one or more conduits, comprising the steps of:
- vibrating at least one of one or more flow tubes in a drive mode vibration;
- receiving an elongation signal from an elongation sensor indicating an elongation of the one or more conduits due to a flowing fluid;
- and
- calculating a momentum term based on the elongation signal;
- providing a first pickoff and a second pickoff on at least one of the one or more flow tubes;
- receiving a first pickoff signal and second pickoff signal by meter electronics from the first pickoff and the second pickoff, respectively, based on a vibrational response to the drive mode vibration;
- wherein the meter electronics is configured to:
- calculate a difference between the first pickoff signal and second pickoff signal;
- determine a mass flow from the pickoff signal difference;
- calculate a velocity using the mass flow rate;
- calculate a momentum product term by multiplying the velocity and the mass flow rate;
- compare the calculated momentum product term with the momentum term;
- and
- indicate a fault if the calculated momentum product term deviates from the momentum term to a degree greater than a predetermined threshold.
11 more elements
A flowmeter (5) including a sensor assembly (10) and a meter electronics (20), comprising:
- one or more flow tubes (103, 103′);
- a driver (104) coupled to the one or more flow tubes (103, 103′) and oriented to induce a drive mode vibration in the one or more flow tubes (103, 103′);
- at least two pickoffs (105, 105′) coupled to the one or more flow tubes (103, 103′) and configured to detect the drive mode vibration, wherein the meter electronics (20) is configured to calculate a first momentum term from the drive mode vibration detected by the at least two pickoffs (105,105′);
- and
- a first elongation sensor coupled to a first flow tube of the one or more flow tubes and a second elongation sensor coupled to a second flow tube, wherein at least one of the first elongation sensor and the second elongation sensor of the first and second flow tubes is configured to output at least one signal whose amplitude is proportional to a fluid momentum-induced strain of the one or more flow tubes (103, 103′), and wherein the meter electronics (20) is configured to calculate a second momentum term from the signal,
- wherein the meter electronics (20) is configured to determine there is a fault in the flowmeter (5) if the first momentum term deviates from the second momentum term to a degree greater than a threshold.
3 more elements
Dependencies are inferred from the claim text.