Electrochemical Sensor Pressure Monitoring
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Solution Overview
Problem
Current pH glass electrodes face challenges in maintaining consistent inner pressure during production and industrial use, leading to potential contamination and inaccurate measurement due to the reliance on air bubble size for pressure assessment, which is not precise and can result in insufficient or excessive pressure.
Innovation Solution
Incorporating a measuring device within the electrochemical sensor that generates an electrical signal based on chamber pressure, utilizing miniaturized pressure sensors and fill-level sensors to continuously monitor and detect inner electrode pressure, with electronics capable of determining impedance or capacitance changes to infer pressure levels, and generating warning signals for pressure deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inner electrode pressure is monitored using an air bubble size assessment, then the pressure can be evaluated, but the measurement precision is insufficient leading to inaccurate pressure determination
Solution Approach 1:
The patent replaces the mechanical/visual assessment method (air bubble size observation) with an electronic pressure sensor that directly measures the inner electrode pressure. This substitution provides precise quantitative pressure data while eliminating the subjectivity and inaccuracy of visual bubble size assessment.
Solution Approach 2:
The patent introduces an electronic pressure sensor as an intermediary device between the pressure chamber and the measurement system. This sensor acts as a mediator that converts pressure information into electrical signals for accurate monitoring, bridging the gap between the physical pressure state and the measurement/control system.
2Adaptability or versatility
If the electrode is stored in a pressure tank with varying pressure settings for each sensor, then the pressure can be adjusted, but the device complexity increases and continuous monitoring becomes impossible
Solution Approach 1:
The patent implements a feedback mechanism where the pressure sensor continuously monitors the inner electrode pressure and provides real-time data to the control system. This feedback loop enables automatic pressure regulation, eliminating the need for manual pressure tank storage and varying pressure settings for each sensor, thereby reducing operational complexity while maintaining adaptability.
Solution Approach 2:
The pressure monitoring and regulation system operates autonomously using the integrated pressure sensor and control electronics. The system self-regulates the pressure without requiring external intervention or complex manual management, enabling each sensor to maintain its own optimal pressure independently.
3Reliability
If the reference electrolyte is pressed out through the diaphragm due to process pressure exceeding inner pressure, then contamination occurs, but detecting this contamination is delayed until measured values drift
Solution Approach 1:
The pressure sensor provides continuous feedback on the inner electrode pressure, enabling real-time detection of pressure drops that indicate electrolyte leakage through the diaphragm. This early warning system allows immediate detection of contamination events before they affect measurement accuracy, preserving measurement reliability and enabling timely intervention.
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 long-term measurement values by precisely monitoring and maintaining optimal pressure within the electrode, preventing contamination and ensuring accurate pH readings by continuously detecting and adjusting pressure levels.
Implementation Method 1
a measuring device which is capable of generating an electrical signal that can be traced back to the pressure in the chamber
Implementation Method 2
the fill-level sensor determines the fill-level of the electrolyte by means of an impedance measurement in particular, capacitance measurement, inductance measurement, or resistance measurement
Data Source
AI summary
The present application relates to an electrochemical reference half-cell, in particular, for an electrochemical sensor for measuring a measurand of a medium surrounding the sensor, including a housing with a chamber that is filled with a reference electrolyte and compressed air, wherein the reference electrolyte is in electrolytic contact with a medium surrounding the chamber across a junction in particular, a diaphragm arranged in a wall of the chamber, and a pickup electrode in particular, comprising an electric conductor immersed in the reference electrolyte, wherein the reference half-cell has a measuring device capable of generating an electrical signal that can be traced back to the pressure in the chamber.