Gas Mixture Filling Using Volumetric and Gravimetric Dosing
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Solution Overview
Problem
Existing methods for producing gas mixtures, such as gravimetric and manometric methods, face challenges in achieving precise dosing at low concentrations due to interference from force shunts and buoyancy effects, requiring the use of premixes and dilution stages to ensure accuracy.
Innovation Solution
A method and device that combines volumetric and gravimetric metering, where the first component is dosed volumetrically and the second component is dosed gravimetrically, using a scale to control the second pressure regulator, allowing for precise mixing of gas components in a gas container, with the second component often being the residual gas that forms the largest proportion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gravimetric method is used to dose gas components, then manufacturing precision can be achieved, but force shunts and buoyancy effects interfere with measurement precision at low concentrations
Solution Approach 1:
A sample volume acts as an intermediary device between the gas source and the final mixture. The sample volume allows for precise volumetric dosing of minor components before they are introduced into the main gas container, avoiding direct measurement interference from buoyancy and force shunt effects that plague gravimetric methods at low concentrations.
Solution Approach 2:
The patent combines volumetric dosing (for minor components via sample volumes) and gravimetric dosing (for major components via scale measurement) into a single integrated system. This hybrid approach leverages the strengths of both methods: volumetric precision for trace components and gravimetric reliability for bulk components, resolving the contradiction between manufacturing precision and measurement precision.
2Manufacturing precision
If premixes and dilution stages are used to achieve accurate low concentration dosing, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The dosing process is segmented into distinct pathways: a first flow path for gravimetric dosing of major components and a second flow path with sample volumes for volumetric dosing of minor components. This segmentation allows each pathway to be optimized for its specific function, achieving high precision without requiring complex premixing stages.
Solution Approach 2:
The sample volumes serve multiple functions: they act as dosing chambers for minor components, provide a controlled environment for volumetric measurement, and enable direct introduction into the final mixture. This multi-functionality eliminates the need for separate premixing equipment and dilution stages, reducing overall device complexity while maintaining manufacturing precision.
3Measurement precision
If volumetric method is used to confine component in sample volume, then dosing precision for low concentrations improves, but device complexity increases due to multiple sample volumes and flow paths
Solution Approach 1:
The system employs dynamic valve control to switch between different flow paths and sample volumes based on the dosing requirements. The multiport valve dynamically connects or disconnects sample volumes from the flow path, allowing flexible configuration without permanent complex piping. This dynamic approach achieves precise volumetric dosing while keeping the physical device structure relatively simple.
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 approach enables automated and reproducible production of gas mixtures without the need for premixes, allowing for direct mixing of components and simultaneous operation of multiple devices, improving accuracy and efficiency in producing gas mixtures with low volume percentages.
Implementation Method 1
the gas container is weighed using a scale to determine the proportion of the at least one second component
Implementation Method 2
the at least one second component via a second flow path d and a second pressure regulator arranged in the second flow path is conducted into the gas container, the second pressure regulator preferably being controlled by means of an output signal from the balance
Implementation Method 3
a volume flow of the component to be dosed is confined in a known sample volume and is transferred from this into the container
Data Source
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AI summary
The invention relates to a method for producing a gas mixture in a gas container (B), having a plurality of components. At least one first component is volumetrically metered, said first component being locked into at least one sample volume (P1, P2, P3, P4) of a plurality of sample volumes from a storage container (V1, V2, V3, VG1, VG2) of the first component and conducted into the gas container from the at least one sample volume (P1, P2, P3, P4), and at least one second component is gravimetrically metered, wherein the at least one second component is conducted from a storage container (V1, V2, V3, VG1, VG2) of the at least one second component into the gas container (B), and the gas container (B) is weighed using a scale (W) in order to determine the content of the at least one second component. The invention further relates to a device for carrying out the method according to the invention.