In-Situ Fluid Level Sensor Calibration Using Pressurized Still Well
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Solution Overview
Problem
Existing liquid level sensors require removal from containers for calibration and verification, which is time-consuming and risky when dealing with toxic fluids, necessitating an in-situ method for ensuring accuracy.
Innovation Solution
A system using a still well with pressurized air or inert gas to adjust fluid levels within the sensor, allowing for in-situ verification of differential temperature liquid level gauges by comparing readings from continuous and point sensors, enabling recalibration without removing the sensor from the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is removed from the container for calibration and verification, then the calibration process can be performed in a controlled environment, but it is time-consuming and exposes the system to risks when dealing with toxic fluids
Solution Approach 1:
A still well is introduced as an intermediary chamber between the toxic fluid environment and the sensor. The still well allows calibration fluid to be introduced and manipulated without exposing the sensor to the toxic main fluid, enabling safe in-situ calibration while maintaining sensor accuracy
2Ease of manufacture
If the sensor is removed from the container for calibration, then calibration can be performed, but the process becomes complex and requires system shutdown
Solution Approach 1:
The calibration system is segmented into distinct functional zones: the still well for fluid manipulation, the sensor housing for protection, and the main container for process fluid. This segmentation allows calibration operations to be performed independently in the still well without affecting the main system, simplifying the calibration procedure
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 method simplifies and accelerates the calibration and verification process, ensuring accurate fluid level readings without exposing the sensor to hazardous conditions, providing real-time validation of sensor accuracy.
Implementation Method 1
Pressurized air or an appropriate inert gas is pumped into the top sealed still well, thereby lowering or reducing the fluid therein to any desired level
Implementation Method 2
When the cable or the surrounding tube and mineral filling are submerged, the fluid dissipates heat from the heated wire and the RTD electrical resistance decreases
Implementation Method 3
An elongated resistance temperature detector (RTD) sensing wire or wires are cable mounted inside an elongated, mineral-filled tube. This continuous RTD provides continuous fluid level readings which result from the resistance changes as level and heat transfer rate changes
Data Source
AI summary
An in-situ method and apparatus for calibrating and verifying the operational accuracy of a fluid level sensor.