Differential pH Probe with Integrated Conductive Enclosure
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Solution Overview
Problem
Current pH probes are complex and costly due to numerous fluid seals, making them large and difficult to manufacture effectively.
Innovation Solution
A differential pH probe design integrates pH-sensitive and non-pH-sensitive glass areas into a single glass piece, reducing the number of seals and overall size, with a co-axial configuration and conductive enclosure that uses insulating seals and a salt bridge to prevent fluid transfer while allowing electrical conductivity, along with integrated temperature sensors for compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current pH probe designs are used with multiple fluid seals, then measurement reliability is maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the reference electrode and measurement electrode into a single integrated probe body, eliminating the need for separate reference electrodes and multiple fluid seals. The conductive enclosure integrates both electrode chambers within one structure, reducing component count while maintaining measurement reliability through the differential measurement approach.
Solution Approach 2:
The conductive enclosure serves multiple functions simultaneously: it provides structural housing for both electrodes, acts as an electrical shield, contains the buffer solution reservoir, and provides mounting for temperature compensation sensors. This multi-functionality reduces the need for separate components and simplifies the overall probe design.
2Stability of the object's composition
If multiple fluid seals are used in pH probes, then fluid compartmentalization is achieved, but manufacturing cost and device size increase
Solution Approach 1:
The conductive enclosure is segmented into distinct chambers (reference electrode chamber and measurement electrode chamber) using internal partitions rather than multiple external seals. This segmentation maintains fluid compartmentalization while using fewer manufacturing steps and lower-cost materials compared to traditional multi-seal designs.
Solution Approach 2:
The patent uses a conductive enclosure material that combines electrical conductivity with chemical resistance and structural integrity. This composite material approach eliminates the need for multiple specialized seal materials, simplifying manufacturing while maintaining the stability of fluid compartments.
3Reliability
If traditional pH probe designs are used, then functional separation is maintained, but probe size and manufacturing complexity increase
Solution Approach 1:
The reference electrode chamber is nested within the conductive enclosure, and the measurement electrode chamber is nested adjacent to it, with both chambers containing their respective electrodes in a compact arrangement. This nesting approach maintains functional separation while minimizing the overall probe volume compared to traditional side-by-side configurations.
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 design simplifies the probe structure, reduces manufacturing costs, and enhances accuracy by minimizing seals and size while maintaining structural integrity and allowing for efficient pH determination with temperature compensation.
Implementation Method 1
A pH probe typically operates using an active chamber that measures a voltage across a pH sensitive material immersed in a sample
Implementation Method 2
a co-axial configuration and conductive enclosure that uses insulating seals and a salt bridge to prevent fluid transfer while allowing electrical conductivity
Data Source
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AI summary
A differential pH probe (150) design uses a container (100) having an outer surface and an inner volume, where the inner volume is divided into a first chamber and a second chamber. A first pH-sensitive area (101) is located on the outer surface of the first chamber where the first pH-sensitive area (101) is configured to be exposed to a sample. A second pH-sensitive area (103) is located on the outer surface of the second chamber where the second pH-sensitive area (103) is shielded from the sample and is exposed to a buffer solution. A first electrode (111) is configured to detect a first voltage in the first chamber and a second electrode (112) is configured to detect a second voltage in the second chamber. Circuitry (110) is coupled to the first and second electrodes (111) and (112) and configured to process the first voltage and the second voltage to determine a pH of the sample.