Guard Electrode Measuring Device with Dynamic Coverage
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Solution Overview
Problem
Measuring devices that analyze substances like dissolved oxygen face challenges in maintaining measurement accuracy and reducing electrolytic solution consumption, especially when oxygen concentrations are low or high, leading to increased consumption and reduced responsiveness.
Innovation Solution
A measuring device with a guard electrode connected to the second electrode through a resistor, which reduces or oxidizes substances in the electrolytic solution to prevent them from reaching the primary electrode, ensuring high responsiveness and minimizing solution consumption by controlling electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a guard electrode is arranged to surround the cathode to improve responsiveness at low oxygen concentrations, then measurement responsiveness is improved, but electrolytic solution consumption increases heavily
Solution Approach 1:
The invention makes the guard electrode's reaction area dynamic by providing a movable protective cover that can be shifted between positions. At low oxygen concentrations, the cover is positioned to allow the guard electrode to surround the cathode for high responsiveness. At high oxygen concentrations, the cover is shifted to reduce the guard electrode's reaction area, preventing excessive electrolytic solution consumption. This dynamic adjustment resolves the contradiction between responsiveness and solution consumption.
Solution Approach 2:
The protective cover creates local quality differences by selectively controlling which portions of the guard electrode are exposed to the electrolytic solution. By shifting the cover, the system locally activates or deactivates reaction areas on the guard electrode, allowing optimized performance for different measurement conditions without permanently fixing the electrode geometry.
2Speed
If the guard electrode contact area with electrolytic solution is increased to improve responsiveness, then measurement responsiveness is improved, but the reaction amount on the guard electrode increases causing heavy electrolytic solution consumption
Solution Approach 1:
The movable protective cover enables dynamic control of the guard electrode's contact area with the electrolytic solution. When high responsiveness is needed, the cover is positioned to maximize contact area. When electrolytic solution consumption becomes excessive, the cover is shifted to reduce contact area, thereby controlling the quantity of oxygen reduced on the guard electrode.
3Device complexity
If the measuring device is designed with unexchangeable electrolytic solution to reduce device complexity, then device complexity is reduced, but frequent device replacement is required due to solution consumption
Solution Approach 1:
The invention changes the operational parameters of the guard electrode by dynamically adjusting its exposed reaction area through the movable protective cover. This parameter change allows the same electrolytic solution to be used for longer periods by reducing unnecessary consumption during high-concentration measurements, thereby extending solution lifespan without adding exchange mechanisms.
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 device maintains high measurement accuracy across varying oxygen concentrations while reducing unnecessary electrolytic solution consumption, extending its lifespan and enabling continuous operation without sacrificing responsiveness.
Implementation Method 1
a cathode and an anode are connected through a wiring cable at a time when the measuring device is used
Implementation Method 2
the oxygen that originally exists in the electrolytic solution reacts on the cathode
Implementation Method 3
the oxygen that originally exists in the electrolytic solution reacts on the cathode and a surplus current flows
Implementation Method 4
an electrochemical reaction on the electrodes at a time of the measurement
Implementation Method 5
a pair of electrodes (an anode and a cathode) are immersed is consumed because of an electrochemical reaction on the electrodes
Implementation Method 6
the electric current due to the electrochemical reaction at a time when the measuring device is not used
Implementation Method 7
a resistor is arranged between the cathode and the anode at a time when the measuring device is not used. With this arrangement, the electric current due to the electrochemical reaction at a time when the measuring device is not used is reduced
Data Source
AI summary
A measuring device comprises a guard electrode that is arranged around a cathode, reduces oxygen that is not from an oxygen permeable membrane, and inhibits the oxygen from reaching the cathode. The guard electrode is electrically connected to an anode through a resistor having a prescribed resistance.