Measuring Cell Molded Part Recess Design
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Solution Overview
Problem
Devices with measuring cells experience flow disruptions and measurement inaccuracies due to components projecting into the inner chamber, leading to eddies, turbulences, and dead volumes, which can damage sensitive media and affect biotechnological applications.
Innovation Solution
A device with a measuring cell design that includes molded parts surrounding components inserted into the cell, featuring recesses that transition cross-sectional areas to minimize abrupt changes and fill dead volumes, promoting a laminar flow by avoiding eddies and turbulences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor components or windows are inserted into the inner chamber of the measuring cell, then measurement capability is enabled, but flow disruptions occur causing eddies, turbulences, and dead volumes
Solution Approach 1:
The patent applies preliminary action by providing a selection of spacers with different thicknesses before the measurement process. These spacers are pre-configured to enable adjustment of the insertion depth of sensor components or windows into the inner chamber. By selecting appropriate spacers in advance, the optical path length can be optimized for different measurement tasks while minimizing flow disruptions and dead volumes, thus resolving the contradiction between enabling measurement capability and avoiding flow disruptions.
2Measurement precision
If optical path length is increased to measure weakly absorbing media, then measurement accuracy improves, but insertion depth of components must be increased which worsens flow disruptions
Solution Approach 1:
The patent implements dynamics by making the optical path length adjustable rather than fixed. Through the use of interchangeable spacers with different thicknesses, the distance between opposing windows can be dynamically adapted based on the specific measurement requirements. For weakly absorbing media, longer optical paths can be selected by using thicker spacers, while for highly absorbent media, shorter paths are chosen. This dynamic adjustment allows optimization of measurement accuracy without permanently increasing insertion depth that would worsen flow disruptions.
3Measurement precision
If components are inserted deeper into the inner chamber to achieve required optical path length, then measurement range expands, but dead volumes increase causing medium mixing
Solution Approach 1:
The patent applies preliminary action by providing a selection of spacers with different thicknesses before the measurement process. These spacers are pre-configured to enable adjustment of the insertion depth of sensor components or windows into the inner chamber. By selecting appropriate spacers in advance, the optical path length can be optimized for different measurement tasks while minimizing flow disruptions and dead volumes, thus resolving the contradiction between enabling measurement capability and avoiding flow disruptions.
Data Source
AI summary
A device for measuring a measured variable of a medium includes: a measuring cell, through which the medium can flow, in the inner chamber of which a channel opens on an inlet side and on an outlet side; a first duct opening into the inner chamber; a first component in the first duct such that an end portion of the first component projects into the inner chamber; and a first molded part, which surrounds on the end portion of the first component and a hollow chamber adjacent to the first component in the inner chamber, and includes, for each channel, a recess which connects the hollow chamber to the corresponding channel and is configured as a cross-sectional converter.