Liquid Level Sensor Tube Slot for Boiling Chemical Vessels
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Solution Overview
Problem
Existing liquid level sensors in high temperature environments, such as those used in semiconductor film deposition systems, experience false readings due to bubble formation when liquids are boiled or vaporized, leading to inaccurate measurements and potential triggering of safety measures.
Innovation Solution
A liquid level sensor tube with a slot or channel is designed to equalize internal and external pressures, allowing for accurate measurement by diffusing surface tension in bubbles and preventing false readings, while using sensors such as ultrasonic, piezoelectric, or optoelectronic sensors within a U-shaped or circular housing made of materials like stainless steel or Teflon that can withstand boiling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid level sensor is used in a boiling environment to monitor liquid levels, then liquid level monitoring capability is provided, but bubble formation causes false readings and reduces measurement accuracy
Solution Approach 1:
The sensor tube is segmented into multiple discrete sensing zones along its length, with each zone containing individual sensors. This segmentation allows the system to identify which specific zone is affected by bubbles and exclude those readings from the overall liquid level determination, thereby maintaining measurement accuracy in boiling environments.
Solution Approach 2:
A slot or channel structure is introduced as an intermediary element within the sensor tube. This slot equalizes pressure between the inside and outside of the tube, preventing bubble formation and distortion that would otherwise interfere with sensor readings, thus improving both reliability and accuracy.
2Reliability
If pressure differential exists between inside and outside of sensor tube, then bubble formation is prevented, but measurement accuracy deteriorates due to false readings
Solution Approach 1:
The slot or channel structure creates equipotential conditions by equalizing the pressure inside and outside the sensor tube. This eliminates pressure differential that would cause false readings, while the segmented sensor zones allow the system to compensate for any remaining minor pressure variations, thereby maintaining both reliability and measurement precision.
3Measurement precision
If multiple sensors are used to improve measurement accuracy, then liquid level detection precision is enhanced, but device complexity increases
Solution Approach 1:
The sensor system is divided into multiple segmented zones along the tube length, with sensors distributed across these zones. This segmentation strategy improves measurement accuracy by allowing selective use of unaffected zones when bubbles are present, while the modular segmented structure actually simplifies the overall system design and maintenance compared to a single complex sensor.
Solution Approach 2:
The system automatically identifies and excludes sensor readings from zones affected by bubbles or other interference, without requiring external intervention or complex processing. This self-service capability allows multiple sensors to work together effectively while keeping the control system simple and robust.
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 provides accurate liquid level monitoring in high temperature environments, reducing false readings and ensuring reliable operation of semiconductor film deposition systems by maintaining pressure equality and minimizing the impact of boiling on sensor accuracy.
Implementation Method 1
allowing for accurate measurement by diffusing surface tension in bubbles
Implementation Method 2
using sensors such as ultrasonic, piezoelectric, or optoelectronic sensors
Implementation Method 3
using sensors such as ultrasonic, piezoelectric, or optoelectronic sensors
Data Source
AI summary
A chemical vessel used for holding a liquid chemical precursor is disclosed comprising a liquid level sensor tube. The liquid level sensor tube is configured to operate in an environment where the liquid chemical precursor is heated to a point of boiling or vaporization. The liquid level sensor tube comprises housing with a slot built in to prevent any false readings of sensors disposed within the liquid level sensor tube.