Quasi-Reference Electrode for In-Line ORP Measurement
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Solution Overview
Problem
Existing ORP measurement systems for water networks face challenges such as the need for frequent maintenance of reference electrodes, complex installation requirements, and high operational costs due to the necessity of side-stream configurations and regular calibration.
Innovation Solution
The development of an ORP measurement apparatus featuring a quasi-reference electrode with a coated metal electrode and a porous element, allowing for in-line measurements without the need for dedicated electrolytes or frequent calibration, and integrated with an electromagnetic flow type water meter for enhanced operational capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference electrode is used to maintain stable reference potential, then measurement accuracy is improved, but maintenance frequency and operational complexity increase
Solution Approach 1:
The patent extracts the reference electrode from the measurement system and replaces it with a quasi-reference electrode that uses the water matrix itself as reference. This eliminates the need for frequent maintenance, electrolyte replacement, and calibration operations while maintaining measurement accuracy through the stable electrochemical properties of the water-embedded reference system.
Solution Approach 2:
The quasi-reference electrode is embedded in the water matrix and uses the water itself as the reference medium. This self-service approach eliminates the need for external reference electrolytes and reduces maintenance requirements, as the system automatically maintains its reference potential through the stable electrochemical environment of the water being measured.
2Stability of the object's composition
If a reference electrode with electrolyte is used, then stable reference potential is achieved, but device complexity and installation requirements increase
Solution Approach 1:
The patent removes the complex reference electrode assembly with its electrolyte reservoirs, porous frits, and pressure requirements. Instead, it embeds a simplified quasi-reference electrode directly in the water matrix, eliminating the need for separate electrolyte management systems and complex installation requirements while maintaining reference potential stability.
Solution Approach 2:
The reference function and measurement function are merged into a single integrated electrode assembly. The quasi-reference electrode is embedded in the water matrix alongside the working electrode, eliminating the need for separate reference electrode compartments, electrolyte fills, and complex sealing arrangements, thereby simplifying the overall device structure.
3Measurement precision
If side-stream configuration is used for ORP measurement, then measurement capability is achieved, but operational cost and maintenance requirements increase
Solution Approach 1:
The patent merges the ORP measurement function with the existing water meter infrastructure. The measurement electrode assembly is integrated into the water meter body, allowing simultaneous flow measurement and ORP measurement through a single device. This eliminates the need for separate side-stream measurement systems, reducing operational costs and maintenance requirements while maintaining measurement capability.
Solution Approach 2:
The water meter is designed to perform multiple functions: flow measurement and ORP measurement. The integrated electrode assembly enables the same device to monitor both water consumption and water quality parameters, eliminating the need for separate dedicated ORP measurement systems and reducing overall operational costs.
4Measurement precision
If frequent calibration against reference standard is performed, then measurement accuracy is maintained, but loss of time and operational complexity increase
Solution Approach 1:
The quasi-reference electrode embedded in the water matrix maintains its reference potential automatically through the stable electrochemical environment of the water itself. This self-calibrating system eliminates the need for frequent manual calibration operations against external reference standards, saving time and reducing operational complexity while maintaining measurement accuracy.
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 solution enables stable and accurate ORP measurements with reduced maintenance requirements, allowing for widespread adoption in water distribution networks, including those with stringent pressure regulations, while lowering operational costs.
Implementation Method 1
ORP is determined by measuring the potential difference between a reference electrode (such as the standard hydrogen electrode or the Ag/AgCl/KCl reference electrode) and a working electrode
Implementation Method 2
The quasi-reference electrode may further comprise a porous element, wherein the porous element is interposed between the coated metal electrode and the flow tube so as to provide a fluid path between the flow tube and the coated metal electrode
Implementation Method 3
apparatus for measuring fluid flow through the flow tube. The apparatus for measuring fluid flow through the flow tube may be an electromagnetic flow type water meter
Data Source
AI summary
Apparatus for monitoring a fluid stream is disclosed. The apparatus includes a measurement section having a flow tube with a flow passage, a quasi-reference electrode in fluid communication with the flow passage, a working electrode in fluid communication with the flow passage, a circuit configured to measure the potential difference between the quasi-reference electrode and the working electrode; and an interface for outputting the potential difference. The quasi-reference electrode is a coated metal electrode consisting of a metal electrode having a surface that is coated at least part with a layer of an insoluble salt of the metal.