Electrical Stability Probe Wiper Deformation Cleaning
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Solution Overview
Problem
Electrodes in electrical stability (ES) testing devices for fluid samples tend to erode or accumulate material, altering the predetermined gap between them, which affects test accuracy and requires frequent cleaning.
Innovation Solution
An ES testing device with a wiper or cleaning fluid system that adjusts to maintain the gap between electrodes, using a wiper that deforms to match the gap width and contacts the electrodes for cleaning, or a cleaning fluid that flows at high velocity to remove residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrodes are used for repeated ES testing, then testing productivity increases, but electrode erosion and material buildup alter the predetermined gap, worsening measurement precision
Solution Approach 1:
The wiper is positioned to automatically clean the electrodes between tests before the next measurement begins. This preliminary cleaning action prevents material buildup that would otherwise alter the gap dimensions, thereby maintaining measurement precision while enabling continuous high-productivity testing.
Solution Approach 2:
The cleaning system is integrated into the testing device itself, allowing the electrodes to be cleaned automatically during the testing process without requiring external intervention or removal from the testing apparatus. The wiper mechanism serves both the cleaning function and maintains the electrode geometry for subsequent measurements.
2Measurement precision
If cleaning is performed frequently to maintain gap accuracy, then measurement precision is maintained, but testing productivity decreases due to increased maintenance time
Solution Approach 1:
The wiper cleaning mechanism operates continuously or between tests without interrupting the overall testing workflow. The cleaning action is integrated into the test cycle, allowing electrodes to be cleaned during transition periods between samples, thereby maintaining measurement precision while minimizing impact on testing productivity.
Solution Approach 2:
Cleaning is performed as a preliminary action between tests rather than as a separate maintenance step. This allows the system to maintain ready-to-use electrodes with accurate gap dimensions while keeping the cleaning operation brief and integrated into the test sequence.
3Ease of operation
If a rigid wiper with width equal to gap is used, then cleaning effectiveness improves, but the wiper cannot pass through the gap to contact both electrodes
Solution Approach 1:
The wiper is designed with flexible or deformable material that allows it to change its effective width dynamically. When passing through the gap, the wiper deforms to a narrower profile enabling passage, and when contacting the electrodes, it expands or maintains full width to ensure comprehensive cleaning surface contact.
Solution Approach 2:
The wiper utilizes flexible material that can be compressed or deformed during passage through the narrow gap between electrodes. This flexibility allows the wiper to adapt its shape to fit through the gap while maintaining sufficient contact surface area with the electrode surfaces for effective cleaning.
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
Effectively maintains the predetermined gap between electrodes, ensuring accurate ES testing by regularly cleaning the electrodes and preventing material buildup, thus enhancing test reliability and reducing maintenance.
Implementation Method 1
The wiper is configured to deform as the wiper passes through the predetermined gap such that the width becomes substantially equal to the predetermined gap and sides of the wiper contact ends of the electrodes to clean the electrodes
Implementation Method 2
The cleaning fluid flows toward the electrodes, through the predetermined gap, or both at a velocity that is greater than or equal to about 5 m/s to clean the electrodes
Data Source
AI summary
An electrical stability testing device includes a cup configured to receive a fluid sample. The testing device also includes a pair of electrodes positioned at least partially within the cup. The electrodes are spaced apart from one another by a predetermined gap. The electrodes are configured to have the fluid sample positioned within the predetermined gap while performing an ES test on the fluid sample in the cup. The testing device also includes a wiper positioned at least partially within the cup. The wiper is configured to pass between the electrodes after the ES test has concluded. A width of the wiper is greater than the predetermined gap between the electrodes. The wiper is configured to deform as the wiper passes through the predetermined gap such that the width becomes substantially equal to the predetermined gap and sides of the wiper contact ends of the electrodes to clean the electrodes.