Electrochemical Sensor Tab Prevents Epoxy Electrolyte Reaction
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Solution Overview
Problem
Existing CO sensors face interference errors and potential false alarms due to the reaction between epoxy sealing material and electrolyte at elevated temperatures, which can disrupt sensor operation and increase baseline readings.
Innovation Solution
Incorporating a tab on the counter electrode that extends into the housing to prevent epoxy from contacting the electrolyte, thereby reducing interaction and potential gas disruption, while allowing leads to pass through sealed gaps in the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy sealing material is used to seal gaps in the housing, then sealing effectiveness is improved, but reaction with electrolyte at elevated temperatures causes false alarms and disrupts sensor operation
Solution Approach 1:
The harmful interaction between epoxy and electrolyte is eliminated by extracting/separating these two materials spatially. The tab structure creates a physical barrier that prevents epoxy from contacting the electrolyte, thereby removing the source of the harmful chemical reaction that causes false alarms.
Solution Approach 2:
The tab acts as an intermediary barrier between the epoxy sealing material and the electrolyte. This intermediate structure prevents direct contact between the two materials, blocking the harmful chemical reaction while still allowing the sealing function to be performed.
2Reliability
If epoxy is applied to seal gaps, then sealing is achieved, but epoxy contact with electrolyte increases baseline readings and disrupts operation
Solution Approach 1:
The harmful interaction between epoxy and electrolyte is eliminated by extracting/separating these two materials spatially. The tab structure creates a physical barrier that prevents epoxy from contacting the electrolyte, thereby removing the source of the harmful chemical reaction that causes false alarms.
Solution Approach 2:
The tab acts as an intermediary barrier between the epoxy sealing material and the electrolyte. This intermediate structure prevents direct contact between the two materials, blocking the harmful chemical reaction while still allowing the sealing function to be performed.
3Ease of operation
If leads are passed through gaps in the housing, then electrical connection is enabled, but gaps remain vulnerable to epoxy-electrolyte interaction
Solution Approach 1:
The housing structure is segmented into distinct functional zones: a sealing region where epoxy is applied to seal gaps, and a protected region where the electrolyte resides. The tab creates a clear separation between these zones, allowing leads to pass through sealed gaps while preventing epoxy from contaminating the electrolyte.
Solution Approach 2:
The tab acts as an intermediary barrier between the epoxy sealing material and the electrolyte. This intermediate structure prevents direct contact between the two materials, blocking the harmful chemical reaction while still allowing the sealing function to be performed.
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 configuration minimizes false alarms and maintains accurate CO concentration readings by preventing the epoxy from reacting with the electrolyte and interfering with gas detection, ensuring reliable sensor operation across varying temperatures.
Implementation Method 1
Electrochemical sensors, in general, may employ a chemical reaction to convert CO to carbon dioxide (CO2) to create a chemical imbalance in a portion of the cell which in turn generates a current indicative of the amount of CO present.
Data Source
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AI summary
Systems and methods for preventing reaction between a sealing material (109) such as epoxy and an electrolyte material within a carbon monoxide or other gas electrochemical sensor (100) are provided. In general, the electrochemical sensor (100) comprises a gas diffusion working electrode (110), a counter electrode (116), and optionally, a reference electrode (114). Each electrode (110, 116, 114) is in contact with an aqueous electrolyte. The gas sensor (100) may comprise a tab (117) located proximate to gaps (108) in the housing (102) of the sensor (100), wherein the tab (117) prevents any sealing material (109) that fills the gaps (108) from entering the interior of the housing (102). In some embodiments, the tab (117) may be attached to a counter electrode (116). In some embodiments, the housing (102) may comprise a slot (132) located about the gaps (108), wherein the tab (117) fits into the slot (132) of the housing (102).