Mobile Phase Tare Weight Determination in Liquid Chromatography
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Solution Overview
Problem
In liquid chromatography, ensuring accurate and reproducible sample separation requires precise control of the mobile phase supply, which is currently hindered by manual tare weight determination and potential inaccuracies, as well as the lack of real-time monitoring of mobile phase consumption and conveyance.
Innovation Solution
A method and control device that determine the tare weight of a mobile phase container using initial gross weight and volume information, along with weight and volume reduction behavior, and compare actual measurement and operation information to ensure accurate and reproducible sample separation by automating the mobile phase management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual tare weight determination is used, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The control device automatically determines the tare weight by monitoring the weight reduction behavior during mobile phase conveyance, eliminating the need for manual tare weight input by the user. The system performs self-calibration by tracking the relationship between conveyed volume and weight reduction, then calculates tare weight based on this behavioral data.
Solution Approach 2:
The system continuously monitors the actual weight of the mobile phase container during operation and compares it with the expected weight based on conveyed volume. This feedback mechanism allows the control device to detect deviations and adjust measurements accordingly, improving precision without adding complex manual calibration procedures.
2Measurement precision
If automated mobile phase management is implemented, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The control device performs multiple functions using the same weight sensor: it monitors mobile phase consumption, determines tare weight, detects leaks, and verifies conveyance accuracy. By making the weight monitoring system multi-functional, the patent improves measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The control device acts as an intermediary that processes weight data and operation parameters to derive meaningful information about mobile phase management. Rather than adding complex physical measurement devices, the system uses intelligent data processing to achieve high measurement precision.
3Reliability
If real-time monitoring of mobile phase consumption is performed, then the reliability is improved, but the loss of time increases
Solution Approach 1:
The weight monitoring operates continuously during mobile phase conveyance without interrupting the separation process. The system accumulates weight data in real-time and processes it to detect issues such as leaks or conveyance problems, maintaining both reliability and operational efficiency.
Solution Approach 2:
The system performs monitoring at strategically selected intervals or thresholds rather than continuously analyzing every data point. For example, it triggers detailed analysis only when weight reduction deviates from expected behavior, reducing processing time while maintaining reliability.
4Reliability
If comparison of actual measurement and operation information is performed, then the reliability is improved, but the productivity decreases
Solution Approach 1:
The control device establishes the weight-volume relationship and tare weight before actual separation operations begin. This preliminary calibration allows subsequent measurements to be performed more quickly with higher reliability, as the baseline for comparison is already set.
Solution Approach 2:
The system performs rapid comparison of actual measurement information with operation information, quickly identifying discrepancies such as leaks or conveyance errors. By efficiently processing the comparison and triggering alerts only when necessary, the system maintains high reliability without significantly impacting productivity.
Data Source
AI summary
In a sample separation apparatus for separating a fluidic sample using a mobile phase provided from at least one mobile phase container, a method of determining a density of the mobile phase includes determining a weight and volume reduction behavior according to which weight and volume of mobile phase in a mobile phase container are reduced during conveying mobile phase from the mobile phase container in the sample separation apparatus. The density of the mobile phase is determined based on the determined weight and volume reduction behavior.