Closure Device for Electrochemical Sensor Measuring Chamber
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Solution Overview
Problem
Electrochemical sensors with membrane-covered measuring chambers face issues of electrolyte depletion and deposit formation, leading to reduced measurement accuracy and sensitivity, especially when analyzing weak oxidants like monochloramine, due to the limited control over membrane pore sizes and salt concentration.
Innovation Solution
A closure device with a permeable membrane and a masking element that partially blocks the permeable surface, extending the diffusion path and reducing electrolyte loss, while allowing selective passage of ions and preventing larger molecules, thereby maintaining higher salt concentrations and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the membrane has a fully permeable surface, then the sensor maintains good measurement accuracy initially, but electrolyte loss increases over time leading to reduced measurement capability
Solution Approach 1:
The patent applies local quality by creating zones of different permeability on the membrane surface through the masking element. The masking element covers specific areas of the membrane, leaving only certain regions permeable. This localized control allows the sensor to maintain measurement accuracy through controlled analyte diffusion while reducing electrolyte loss by limiting the permeable surface area.
Solution Approach 2:
The patent segments the membrane surface into permeable and non-permeable regions using the masking element. This segmentation divides the originally uniform permeable surface into distinct functional zones, allowing differential control over substance transport - enabling selective reduction of electrolyte loss while preserving analyte detection capability.
2Ease of manufacture
If the membrane pore size is fixed by commercial availability, then the membrane can be easily manufactured, but fine adjustment of sensor slope is not possible
Solution Approach 1:
The patent applies parameter changes by using the masking element to modify the effective permeable surface area of the membrane. Instead of changing the membrane's intrinsic pore size, the masking element adjusts the functional parameters (permeable area, diffusion path) to achieve desired sensor characteristics including slope adjustment, while maintaining ease of membrane manufacturing.
3Loss of substance
If the permeable surface area of the membrane is reduced, then electrolyte loss decreases, but measurement sensitivity may be compromised
Solution Approach 1:
The masking element creates localized permeable regions that optimize the balance between electrolyte retention and analyte detection. By strategically positioning the masking element to cover specific membrane areas, the invention maintains sufficient permeable surface area for sensitive measurement while reducing overall electrolyte loss through controlled diffusion pathways.
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 closure device significantly increases the service life and accuracy of electrochemical sensors by reducing electrolyte loss and enabling directed diffusion of analytes, allowing for precise adjustment of sensor sensitivity and longer maintenance intervals.
Implementation Method 1
the pores of the membrane selectively allow the constituent of the sample to be determined to pass through into the measuring chamber
Implementation Method 2
the membrane enables a selective supply or discharge of a substance to or from the measuring chamber
Implementation Method 3
extending the diffusion path and reducing electrolyte loss
Data Source
AI summary
A closure device for a measuring chamber of an electrochemical sensor, a measuring chamber comprising such a closure device, and an electrochemical sensor comprising such a measuring chamber.