Cryogenic Storage Control with Dual Fill-Level Sensing
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Solution Overview
Problem
Cryogenic storage devices face issues with inaccurate fill level measurements due to clogging from condensation, difficulty in accessing and servicing lighting arrangements, and lengthy calibration processes, which hinder efficient operation and visibility into stored items.
Innovation Solution
A dual fill level measurement system using differential pressure and a thermistor array within the cryogenic storage container, combined with a lighting assembly that is easily accessible and replaceable, and automated processes like high-pressure calibration and periodic purging to prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential pressure measurement system is used to determine fill level, then fill level measurement is achieved, but the system becomes clogged due to condensation forming from moisture introduction
Solution Approach 1:
The patent extracts the measurement function from the problematic differential pressure system and implements it using a dipstick with visual indicators. The dipstick directly measures liquid level through visual observation of liquid contact, bypassing the clogged pressure sensing mechanism entirely. This separates the measurement function from the vulnerable pressure lines that condense moisture.
Solution Approach 2:
The dipstick acts as an intermediary measurement tool that physically contacts the liquid without requiring sealed pressure lines. By using a simple rod with visual indicators rather than electronic pressure sensors, the system avoids the condensation clogging issue while still providing accurate fill level determination.
2Illumination intensity
If lighting arrangements are installed within the interior volume for visibility, then visibility into stored items is improved, but the lighting elements become difficult to access and service at low temperatures
Solution Approach 1:
The lighting system is segmented into modular LED elements that can be individually accessed and replaced. The lighting assembly is divided into discrete components rather than a single integrated unit, allowing specific faulty elements to be serviced without replacing the entire lighting system or accessing difficult-to-reach areas.
Solution Approach 2:
The lighting elements are pre-configured as replaceable modules with easy-access mounting mechanisms. By designing the lighting system with predetermined access points and modular construction before deployment, the patent enables quick servicing without requiring complex disassembly or access to cold, confined spaces during maintenance operations.
3Measurement precision
If a lengthy calibration process involving dipstick and depressurized/pressurized calibration is performed, then accurate fill level information is obtained, but significant delay occurs between installation and availability for use
Solution Approach 1:
The patent replaces complex mechanical calibration procedures (depressurization, pressurization, dipstick insertion) with a simplified visual calibration method. The dipstick provides direct visual indication of liquid level that can be correlated with electronic sensor readings, eliminating the need for lengthy pressure cycling and mechanical adjustment procedures while maintaining calibration accuracy.
Solution Approach 2:
The calibration approach changes from pressure-based parameters (depressurized/pressurized states) to visual/positional parameters (dipstick liquid contact level). By changing the calibration parameter from pressure states requiring time to equilibrate to direct visual observation, the patent dramatically reduces calibration time while preserving measurement accuracy.
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
Ensures accurate and reliable fill level monitoring, simplifies calibration, and maintains system visibility and accessibility, enhancing operational efficiency and user experience.
Implementation Method 1
obtain, via the differential pressure system, a pressure at a top of the interior volume and a pressure proximate to a bottom of the interior volume
Implementation Method 2
obtain, via the thermistor array, a resistance of each thermistor indicative of a temperature at each of the predetermined depths
Implementation Method 3
a lighting assembly with a readily replaceable lighting element may be provided that can be installed within an interior volume of such a cryogenic storage device
Data Source
AI summary
A cryogenic storage control system and storage device assembly are provided. The cryogenic storage control system may utilize a dual fill level measurement arrangement in which a differential pressure-based fill level determination is compared to a fill level determined from an array of thermistors positioned at varying depths within the cryogenic storage container. Significant disagreement between fill level determinations may result in an alert being generated by a control system. Additionally, various operational processes may be implemented to ensure proper operation including calibration processes, monitoring processes, and maintenance processes.