Capacitive Electrode Stack for Gas-Tolerant Fluid Volume Measurement
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Solution Overview
Problem
Existing liquid measurement devices face challenges in achieving high precision while maintaining a simple design, particularly when dealing with liquids containing gas components, as they often require complex gas separators and precise calibration to account for gas inclusions.
Innovation Solution
A device with a capacitive fill level measuring device featuring a stack of multiple electrode plates arranged in an interdigital structure, which tolerates gas components and provides a sensitive measurement of liquid content without the need for a gas separator, ensuring high accuracy and low flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas separator is used to separate gas components before measurement, then measurement reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent extracts the gas measurement function from a separate physical gas separator and integrates it into the electrode arrangement itself. The electrodes directly detect gas bubbles in the liquid flow, eliminating the need for a dedicated gas separation device while maintaining measurement reliability.
Solution Approach 2:
The electrode arrangement serves multiple functions: it acts as both the flow measurement sensor and the gas detection device. By making the electrode arrangement multi-functional, the patent eliminates the need for separate gas separation equipment, reducing device complexity while maintaining measurement accuracy.
2Measurement precision
If a gas separator is used to separate gas components, then measurement precision is improved, but the device requires more space and has higher weight
Solution Approach 1:
The patent removes the heavy gas separator component and extracts only the essential gas detection function, integrating it into the lightweight electrode arrangement. This maintains measurement precision while dramatically reducing device weight.
3Manufacturing precision
If calibration regulations require high precision filling level measurement, then delivery quantity accuracy is improved, but the device requires complex calibration procedures
Solution Approach 1:
The patent implements feedback by continuously monitoring the dielectric constant and using this information to compensate for gas bubble effects in real-time. This automatic feedback mechanism simplifies calibration procedures while maintaining high delivery quantity accuracy according to calibration regulations.
Solution Approach 2:
The patent changes the measurement parameter from direct volume measurement to dielectric constant measurement, which is less sensitive to gas bubbles. This parameter change simplifies calibration while maintaining the required delivery quantity accuracy.
4Device complexity
If gas fractions are tolerated in flow measurement and used to determine delivery rate, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the measurement approach by monitoring the dielectric constant of the liquid, which varies with gas bubble content. This allows the system to tolerate gas fractions in the flow while maintaining delivery rate accuracy through continuous parameter monitoring and compensation.
Solution Approach 2:
The patent uses feedback by continuously measuring the dielectric constant and using this information to compensate for gas effects in the flow measurement, maintaining precision without requiring complex gas separation equipment.
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 solution enables precise measurement of liquid quantity with high accuracy and low design complexity, allowing for high throughput and enhanced security against manipulation, while avoiding the need for gas separators and their associated complications.
Implementation Method 1
a capacitance measurement or a conductivity measurement can be provided for measuring the fill level
Implementation Method 2
the electrode arrangement of the degree of filling measuring device has a large number of electrode plates which form a stack of plates in the area of the measuring line
Data Source
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AI summary
The invention relates to a device for detecting a volume while receiving and/or discharging a fluid having a gas portion, comprising a measurement line for conducting the fluid, a flow meter unit for the fluid in fluid connection to the measurement line, a fill level measuring unit for the fluid in fluid connection to the measurement line, the unit comprising an electrode arrangement for determining electrical properties of the fluid present in the measurement line, and an evaluation unit for determining the fluid amount delivered, which is in a signal connection to the fill level measuring unit and the flow meter unit. The invention provides that the electrode arrangement of the fill level measuring unit has a plurality of electrode plates that form a plate stack in the region of the measurement line.