Liquid Chromatograph Flow Cell Identification for Wavelength Check Reliability
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Solution Overview
Problem
In liquid chromatographs, using multiple types of flow cells complicates wavelength checks, potentially compromising the reliability of analysis results due to uncertainty about which cell is used during periodic validation.
Innovation Solution
A liquid chromatograph system that includes a spectroscopic analysis unit, a cell information reading unit to access unique cell information, a wavelength check control unit for executing wavelength checks, a wavelength check information storage unit to associate results with cell information, and a system check report creation unit to document these results, ensuring accurate identification of the flow cell used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of flow cells are used in the liquid chromatograph, then the versatility and adaptability of the system is improved, but the reliability of analysis results deteriorates due to uncertainty about which cell is used during periodic validation
Solution Approach 1:
A flow cell identifier is introduced as an intermediary component attached to each flow cell. This identifier mediates between the flow cell and the validation system by providing a unique identification mechanism that allows the system to track which specific flow cell is being used during validation, thereby maintaining reliability while allowing multiple flow cell types to be used
Solution Approach 2:
The system implements feedback by recording and storing flow cell identification information along with validation results. This feedback mechanism ensures that the system knows which flow cell was used for validation, allowing for proper tracking and assurance that the validation results correspond to the correct flow cell, thus maintaining reliability with multiple flow cell types
2Device complexity
If periodic wavelength check is performed without flow cell identification, then the simplicity of the validation process is maintained, but the loss of information about which flow cell was used increases
Solution Approach 1:
The flow cell identifier acts as an intermediary that captures and transmits flow cell information to the validation system. This simple attachment point provides unique identification without complicating the overall validation process, preventing information loss while maintaining simplicity
Solution Approach 2:
Instead of physically tracking each flow cell through complex mechanisms, the system creates a digital copy or record of the flow cell identification information. This copied information is stored with the validation results, preventing information loss while keeping the physical validation process simple
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 system securely maintains the reliability of analysis results by clearly specifying which flow cell is used during wavelength checks and ensuring consistency between validation and analysis cells.
Implementation Method 1
a spectroscopic analysis unit configured to perform spectroscopic analysis by irradiating a flow cell through which an eluent eluted from a column flows with light
Implementation Method 2
a cell information reading unit that is provided in the spectroscopic analysis unit and configured to access a storage device attached to the flow cell to acquire cell information that is information unique to a type or an individual of the flow cell
Implementation Method 3
In the wavelength check, the flow cell is irradiated with light from the light source (for example, a deuterium lamp or a halogen lamp) having an emission line at a known wavelength
Implementation Method 4
a spectrum in which the wavelength is taken on the horizontal axis and the received light intensity is taken on the vertical axis is created based on the detection result in the photodiode array at that time
Data Source
AI summary
A liquid chromatograph including a spectroscopic analysis unit (40) that performs spectroscopic analysis by irradiating a flow cell (90) through which an eluent eluted from a column (31) flows with light is provided with a cell information reading unit (49) that is provided in the spectroscopic analysis unit and accesses a storage device (91) attached to the flow cell to acquire cell information that is information unique to a type or an individual of the flow cell; a wavelength check control unit (51) that causes the spectroscopic analysis unit to execute wavelength check; a wavelength check information storage unit (53) in which a result of the wavelength check is stored in association with the cell information acquired at a time of executing the wavelength check; and a system check report creation unit (74) that creates a system check report in which the result of the wavelength check and the cell information acquired at the time of executing the wavelength check are described by referring to the wavelength check information storage unit. This makes it possible to sufficiently secure the reliability of the analysis result.