Source Vessel Inlet Tube Layout for Accurate Liquid Level Sensing
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Solution Overview
Problem
Conventional systems for refilling source vessels in semiconductor fabrication cause false sensor readings due to direct liquid spray and splashing onto sensors, leading to inaccurate liquid level detection.
Innovation Solution
An apparatus with an inlet tube that directs liquid flow onto the sidewall of the source vessel, preventing direct contact with the sensor and minimizing splashing, while using a sensor to accurately monitor liquid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet tube directs liquid directly into the source vessel, then the refilling process is simple and fast, but the liquid spray and splashing cause false sensor readings
Solution Approach 1:
The inlet tube is positioned and oriented to direct liquid flow onto the sidewall of the source vessel rather than directly into the liquid or toward the sensor. This sidewall acts as an intermediary surface that allows liquid to enter the vessel without creating spray or splashing that would interfere with sensor readings, thus maintaining both refilling efficiency and measurement accuracy
2Reliability
If the inlet tube is positioned to avoid direct liquid contact with the sensor, then false sensor readings are prevented, but the inlet tube configuration becomes more complex
Solution Approach 1:
The inlet tube is positioned at a specific location and oriented at a specific angle to direct liquid flow onto a particular area of the sidewall. This localized approach ensures that liquid enters the vessel without spraying toward the sensor while maintaining a relatively simple overall tube configuration, balancing reliability with device simplicity
Data Source
AI summary
An apparatus capable of controlling a liquid may provide a source vessel to contain the liquid and an inlet tube for flowing the liquid into the source vessel. The inlet tube may extend into the source vessel and may be arranged to direct the flowing liquid onto a sidewall of the source vessel.