Electromagnetic Flow Meter Electrode Diagnosis via Differential Noise Isolation
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Solution Overview
Problem
Existing electromagnetic flow meters face challenges in accurately diagnosing electrode abnormalities due to noise interference in flow rate signals, which hinders the determination of actual fluid flow rates and insulation deterioration.
Innovation Solution
The electromagnetic flow meter incorporates a differential circuit and an AC signal generation circuit to produce differential flow rate signals, allowing a diagnosis unit to calculate resistance values and diagnose electrode abnormalities by analyzing the difference in resistance values between installation and operation stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If individual flow rate values are obtained directly from flow rate signals output from measurement electrodes, then the diagnosis process is simple, but noise such as commercial noise hides the actual flow rate information and prevents accurate determination of individual flow rate values and insulation deterioration
Solution Approach 1:
A differential amplifier is introduced as an intermediary component between the measurement electrodes and the diagnosis unit. The differential amplifier processes the flow rate signals by removing noise components (particularly commercial noise) while preserving the actual flow rate information. This allows the diagnosis unit to receive cleaned signals for accurate individual flow rate value determination and insulation deterioration diagnosis, resolving the contradiction between simple diagnosis process and accurate measurement.
2Measurement precision
If noise removal processing is applied to flow rate signals before obtaining individual flow rate values, then accurate flow rate measurement is achieved, but the diagnosis process becomes more complex
Solution Approach 1:
Noise removal processing is performed in advance (preliminarily) on the flow rate signals before they are used for individual flow rate value calculation and insulation deterioration diagnosis. The differential amplifier预先 removes noise components from the signals, so that subsequent diagnosis operations work with cleaned data. This preliminary noise removal enables accurate measurement without significantly complicating the overall diagnosis process, as the noise filtering is handled by a dedicated component rather than complex software processing.
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 enables accurate diagnosis of electrode abnormalities, improving the reliability of flow rate measurements and insulation assessment by isolating noise components and determining abnormal conditions in the electrodes.
Implementation Method 1
measures velocity of fluid that is a measurement target flowing in a magnetic field formed inside a measurement pipe... a first detection electrode (1A) that detects electromotive force generated by the fluid... and a second detection electrode (1B) that detects electromotive force generated by the fluid
Data Source
AI summary
A first detection electrode that outputs a first flow rate signal and a second detection electrode that outputs a second flow rate signal, a differential circuit that outputs a differential flow rate signal obtained by obtaining a difference between the first flow rate signal and the second flow rate signal, an AC signal generation circuit that causes a first AC current to flow between the first detection electrode and the ground electrode and causes a second AC current with a reverse phase at the same frequency as that of the first AC current to flow between the second detection electrode and the ground electrode, and a diagnosis unit that diagnoses an abnormality of at least either of the first detection electrode or the second detection electrode based on a differential flow rate signal.