Inline pH Sensor Pressure Regulation for High-Pressure Channels
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Solution Overview
Problem
Traditional inline pH sensors face challenges in performing continuous pH measurements in channels with high internal pressure, as they can cause pressure increases leading to glass film damage, making measurements impossible.
Innovation Solution
The inline pH sensor design includes a glass electrode unit with a pressure transmission unit to regulate internal pressure and a comparative electrode unit with a liquid junction unit, both connected to a main pipe, allowing for controlled pressure differences to prevent glass film damage and enable continuous measurement under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional inline pH sensor structure is used in high pressure channels, then continuous pH measurement is enabled, but pressure increases cause glass film damage
Solution Approach 1:
The sensor is divided into separate functional units: a pressure-resistant housing containing the electronics and a separate glass film measurement chamber. This segmentation allows the glass film to be protected from direct exposure to high channel pressures while maintaining its functionality for pH measurement.
Solution Approach 2:
A pressure-balancing membrane or intermediate chamber is introduced between the high-pressure channel and the glass film. This intermediary element equalizes pressure differences, allowing the glass film to operate in a lower pressure environment while still measuring the pH of the high-pressure fluid through the membrane.
2Strength
If pressure transmission unit is added to regulate internal pressure, then glass film damage is prevented, but device complexity increases
Solution Approach 1:
The sensor utilizes the process fluid's own pressure to balance the internal pressure of the measurement chamber. By designing the pressure transmission path to allow fluid pressure to naturally equalize across the glass film, active pressure regulation mechanisms are eliminated, reducing device complexity while maintaining glass film protection.
Solution Approach 2:
A hydraulic pressure-balancing chamber is used where the process fluid pressure directly acts on a flexible membrane that transmits pressure to the glass film chamber. This passive hydraulic system automatically equalizes pressures without requiring external actuators or complex control systems.
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 design allows for stable and continuous pH measurement of test liquids in channels with high internal pressure by reducing pressure differences across the glass film, preventing damage and ensuring accurate pH readings.
Implementation Method 1
The first pressure transmission unit regulates the internal pressure of the first storage unit to control the pressure difference between the first storage unit and the main pipe separated by the glass film
Implementation Method 2
The second pressure transmission unit regulates the internal pressure of the second storage unit to control the pressure difference between the second storage unit and the main pipe separated by the liquid junction unit
Implementation Method 3
a glass electrode whose potential changes in accordance with pH
Implementation Method 4
a method of stably drawing the buffer solution contained in the comparative electrode into a test liquid by making the fluid (text liquid) apply pressure to the buffer solution contained in the comparative electrode
Data Source
AI summary
A pH sensor includes a glass electrode unit to respond to pH; a comparative electrode unit to be measured for its potential relative to the glass electrode unit; a main pipe to convey test liquid; and a fluid inlet connected to the glass electrode unit and the main pipe. The glass electrode unit includes: a first storage unit filled with electrolyte solution; a first electrode to electrically connect the inside and outside of the first storage unit; a glass film disposed between the first storage unit and the main pipe; and a first pressure transmission unit connected to the fluid inlet. The first pressure transmission unit regulates the internal pressure of the first storage unit to control the pressure difference between the first storage unit and the main pipe separated by the glass film. The comparative electrode unit includes: a second storage unit filled with buffer solution; a second electrode to electrically connect the inside and outside of the second storage unit; a liquid junction unit disposed between the second storage unit and the main pipe; and a second pressure transmission unit connected to the fluid inlet. The second pressure transmission unit regulates the internal pressure of the second storage unit to control the pressure difference between the second storage unit and the main pipe separated by the liquid junction unit.