Branched Fluid-Channel Reference Electrode for Stable Sensing
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Solution Overview
Problem
Traditional reference electrodes are complex to integrate into smaller sensing assemblies, incompatible with dried-state storage, and not suited for miniaturization or mass production, particularly in systems requiring stable potential for accurate potentiometric and amperometric sensors.
Innovation Solution
A sensing assembly with a primary fluid channel and a secondary fluid channel branching off to house a reference electrode element, limiting fluid sample flow to the reference electrode, allowing for a stable potential without direct exposure to the sample, enabling miniaturization and durable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional reference electrode is used, then stable potential is achieved, but device complexity and integration difficulty increase
Solution Approach 1:
The sensing assembly is divided into separate functional zones: a primary fluid channel for sample flow and a secondary fluid channel for reference electrode housing. This segmentation allows the reference electrode to be isolated from the complex sample matrix while maintaining electrical connection, thereby achieving stable potential without increasing overall integration complexity.
Solution Approach 2:
A secondary fluid channel acts as an intermediary between the primary sample channel and the reference electrode. This intermediate structure provides a controlled environment for the reference electrode, allowing it to maintain stable potential while being physically separated from the complex sample matrix, thus reducing integration difficulty.
2Reliability
If a traditional reference electrode with liquid junction is used, then stable potential is maintained, but compatibility with dried state storage is lost
Solution Approach 1:
The reference electrode design allows for parameter changes between operational and storage states. During operation, the secondary fluid channel is filled with reference electrolyte to maintain stable potential. During storage, the system can be dried completely, removing the electrolyte. This parameter change capability enables both stable potential during use and compatibility with dried state storage for extended periods.
3Ease of operation
If reference electrode is exposed to fluid sample, then measurement function is achieved, but potential stability deteriorates
Solution Approach 1:
The fluidic path is segmented into a primary channel for sample flow and a secondary channel for reference electrode housing. The sample flows through the primary channel where working electrodes perform measurements, while the reference electrode remains isolated in the secondary channel, preventing direct exposure to the sample matrix and maintaining potential stability.
Solution Approach 2:
The secondary fluid channel serves as an intermediary structure that provides controlled access for the reference electrode. It allows the reference electrode to maintain its potential stability by being shielded from the sample, while still enabling electrical measurement functions through the fluid connection to the primary channel.
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
The configuration provides a stable reference electrode potential, reduces deterioration, and enables storage without electrolyte, facilitating miniaturization and mass production, suitable for intermittent measurement systems.
Implementation Method 1
a reference electrode element provided in the secondary fluid channel... maintain a stable potential
Data Source
AI summary
The present disclosure provides a sensing assembly for sensing a property of a fluid sample comprising at least one working electrode provided in the primary fluid channel configured to sense a property of a fluid sample in the primary fluid channel; a secondary fluid channel adjacent to and fluidly connected to the primary fluid channel along the primary flow path; and a reference electrode element provided in the secondary fluid channel. The secondary fluid channel is arranged as a branch from the primary flow channel so as to limit the flow of fluid sample from the primary flow channel to the reference electrode element. Alternatively or additionally, a method comprises determining a property of a sample comprising providing such a sensing assembly.