Flow Meter Electrode Impedance Diagnosis for Gas Bubbles and Deposits
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Solution Overview
Problem
Existing flow meters, particularly magnetically inductive and capacitive types, face challenges in accurately diagnosing device status and changes in the flowing medium due to gas bubbles, deposits, and other perturbations, which affect measurement accuracy and reliability.
Innovation Solution
The method involves applying a signal to one electrode and measuring impedances at a non-activated electrode, comparing these values with previous ones to qualitatively and quantitatively assess device and medium status, and using adaptive corrections and cleaning signals to address perturbations, while simultaneously measuring flow rates and detecting deposits and gas bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance measurement is performed between powered electrodes and grounding point, then deposit formation can be inferred, but gas bubble detection capability is insufficient
Solution Approach 1:
The measurement system is segmented into two independent parts: (1) measurement of impedance between powered electrode and grounding point for deposit detection, and (2) measurement of impedance between non-activated electrode and grounding point for gas bubble detection. This segmentation allows each measurement to serve its specific diagnostic purpose without interference.
Solution Approach 2:
The non-activated electrode serves as an intermediary element that enables gas bubble detection without requiring direct signal application to it. By measuring impedance at this intermediary electrode, the system can detect gas bubbles in the measurement medium while maintaining the primary measurement function at the powered electrode.
2Reliability
If multiple diagnostic measurements are added to detect gas bubbles and deposits, then diagnosis capability is improved, but device complexity increases
Solution Approach 1:
The flow meter's electrode system is given multiple functions: the powered electrode performs both the primary flow measurement and deposit detection through impedance measurement, while the non-activated electrode enables gas bubble detection. This multi-functionality allows the system to diagnose multiple issues without adding separate dedicated sensors for each function.
Solution Approach 2:
The diagnostic measurement functions are merged with the existing measurement electrodes rather than adding completely separate diagnostic systems. The impedance measurements at both powered and non-activated electrodes are integrated into the existing signal processing architecture, combining flow measurement and diagnostic capabilities in a unified system.
3Reliability
If continuous monitoring of impedance values is performed, then real-time diagnosis is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system performs impedance measurements periodically or at specific intervals during operation. The non-activated electrode impedance is measured at appropriate times to detect gas bubbles, and the powered electrode impedance is measured to detect deposits, allowing real-time diagnosis while minimizing energy consumption by avoiding constant measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides reliable and reproducible detection of gas bubbles and deposit formation, correcting flow rate displays and enabling automatic cleaning, thus improving measurement accuracy and maintaining device integrity.
Implementation Method 1
The most popular flow meters are ones which are operated magnetically inductively. In this case a magnetic field is induced via a defined measurement tube, and a signal generated by the magnetic field is measured by at least one pair of electrodes, which have a junction with the fluid.
Implementation Method 2
a signal E1i in the form of a current or a voltage is applied to at least one electrode and, at another electrode E2i which does not receive the signal or is not currently activated, impedances are determined and/or voltage(s) and/or current(s) are measured
Data Source
AI summary
Systems and methods are directed to method and device operating a flow meter. The flow meter including electrodes which can be used to feed a signal into fluid to be measured. A signal E1i in the form of a current or a voltage is applied to at least one first electrode. A response signal is measured at another electrode E2i which does not receive the signal or is not currently activated, to record a diagnosis the flow meter and the changes in the consistency of the flowing medium at any time during measurement operation. Impedances are determined and/or voltage(s) and/or current(s) are measured, wherein these values are set in comparison/ratio with previous values and the status of the device and/or of the measurement medium is deduced both qualitatively and quantitatively.