Dual-Membrane Sensor Cap for Electrolyte Leakage Control
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Solution Overview
Problem
Electrochemical sensors face a shortened service life due to electrolyte leakage through the membrane, increasing maintenance efforts.
Innovation Solution
A sensor cap with a dual membrane system, comprising a permeable and impermeable membrane elements, welded to a main part, reduces electrolyte leakage by preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single permeable membrane is used to allow analyte transport, then the sensor can detect analytes effectively, but electrolyte components migrate through the membrane into the surrounding medium, shortening service life
Solution Approach 1:
The membrane is divided into two distinct membrane elements with different properties. The first membrane element is permeable to the analyte for detection, while the second membrane element is impermeable to the analyte but allows electrolyte retention. This segmentation resolves the contradiction by separating the functions of analyte transport and electrolyte containment into distinct structural components.
Solution Approach 2:
Different regions of the membrane structure are assigned different functional qualities. The first membrane element has local quality of analyte permeability for detection function, while the second membrane element has local quality of electrolyte impermeability for retention function. This local differentiation allows simultaneous achievement of analyte detection and electrolyte protection.
2Loss of substance
If the membrane is made impermeable to prevent electrolyte leakage, then electrolyte retention improves, but analyte transport is blocked, preventing detection
Solution Approach 1:
The membrane system is segmented into two functional elements: the first membrane element maintains analyte permeability for detection, while the second membrane element provides electrolyte impermeability for retention. This segmentation allows both contradictory requirements to be satisfied in different parts of the same membrane structure.
Solution Approach 2:
The membrane structure uses composite construction with two different membrane elements having distinct material properties. One element is designed with materials that permit analyte passage, while the other uses materials that block electrolyte migration. The composite structure combines these opposing material properties to achieve both detection and retention functions simultaneously.
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 dual membrane system extends the sensor's service life by minimizing electrolyte loss, enhancing durability and accuracy.
Implementation Method 1
the first membrane element is permeable to the analyte
Implementation Method 2
the second membrane element comprises a material that is impermeable to the analyte
Implementation Method 3
the first membrane element and the second membrane element are welded to the main part
Data Source
AI summary
A sensor cap for an electrochemical sensor for determining the concentration of an analyte in a measurement medium, includes a main part, which extends along a first axis and has a first end, which has a first opening, and a second end, which is opposite the first end and has a second opening, wherein an electrolyte chamber extends between the first opening and the second opening and a connecting unit is formed at the second end in order to connect the sensor cap to a sensor body of the electrochemical sensor, a membrane unit having a first membrane element and a second membrane element, wherein the first membrane element is permeable to the analyte and the second membrane element comprises a material that is impermeable to the analyte, wherein the second membrane element has a through-hole.