Wet gas measurement

• US 8,447,535 B2
• Filed: 01/24/2012
• Issued: 05/21/2013
• Est. Priority Date: 08/28/2006
• Status: Active Grant

• Current Assignee: Schneider Electric Systems USA, Inc. (Schneider Electric SE)
• Original Assignee: Invensys Systems Incorporated (Invensys PLC)
• Inventors: Henry, Manus P., Tombs, Michael S.
• Primary Examiner(s): Desta, Elias
• Application Number:
  US13/357,151
• Publication Number:
  US 20120216626A1
• Time in Patent Office: 483 Days
• Field of Search: 702/12, 702/45, 702/48, 702/100, 73/542.5, 731/524.7, 738/613.56, 738/613.55
• US Class Current: 702/48
• CPC Class Codes: G01F 1/74 Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• CPC Class Codes: G01F 1/8409 constructional details
• CPC Class Codes: G01F 1/8431 electronic circuits
• CPC Class Codes: G01F 1/8436 signal processing
• CPC Class Codes: G01F 1/8481 having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point
• CPC Class Codes: G01F 1/8486 with multiple measuring conduits
• CPC Class Codes: G01F 15/024 involving digital counting
• CPC Class Codes: G01F 25/10 of flowmeters
• CPC Class Codes: G01N 9/002 using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis G01N9/34 takes precedence

Abstract

A multi-phase process fluid is passed through a vibratable flowtube. Motion is induced in the vibratable flowtube. A first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube is determined, and an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property is determined. A corrected intermediate value is determined based on a mapping between the intermediate value and the corrected intermediate value. A phase-specific property of a phase of the multi-phase process fluid is determined based on the corrected intermediate value.

Claims

1. A method comprising:

passing a multi-phase process fluid through a vibratable flowtube;

inducing motion in the vibratable flowtube;

collecting sensor data from a sensor attached to the flowtube;

providing a computer system further comprising a computer processor with computer instructions;

said instructions performing the steps of;

determining frequency from collected sensor data;

comparing with an expected frequency range;

eliminating a zero offset when frequency is within the expected range;

determining an amplitude;

determining a phase; and

calculating a drive signal using the amplitude and phase.

2. The method of claim 1, wherein the zero offset is provided from a zero offset compensation procedure.

3. The method of claim 1, wherein the amplitude is determined using a Fourier-based technique.

4. The method of claim 1, wherein the phase is determined using a Fourier-based technique.

5. The method of claim 1, wherein the calculated drive signal is feed back into the positive drive signal to vibrate the flow tube.

6. The method of claim 1, wherein the frequency is outside the expected range and setting a stall signal for subsequent communication.