Liquid chromatograph device
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Solution Overview
Problem
Conventional liquid chromatograph devices face challenges in accurately controlling the temperature of the analysis column and result in increased environmental loads due to the need to discard sensors and heaters when replacing the analysis column.
Innovation Solution
A liquid chromatograph device with a column cartridge and main body that includes column-side and column oven-side heat blocks, along with first and second temperature sensors, allows for accurate temperature management and control by ensuring proper contact between these blocks, thereby reducing the need to replace sensors and heaters with column replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor or heater is mounted on the analysis column itself, then temperature control accuracy is improved, but environmental loads increase due to disposal of sensors and heaters with column replacement
Solution Approach 1:
The temperature control system is segmented into two parts: a reusable main body containing the sensor and heater, and a disposable column cartridge. This allows the analysis column to be replaced while retaining the sensor and heater in the main body, reducing environmental loads while maintaining temperature control accuracy.
Solution Approach 2:
A column-side heat block is introduced as an intermediary component between the column oven-side heat block and the analysis column. This heat block can be detached and replaced with the column, while the temperature sensor and heater remain in the main body, enabling accurate temperature measurement and control without discarding reusable components.
2Measurement precision
If temperature sensors are mounted on the analysis column, then temperature measurement accuracy is improved, but device complexity increases due to additional components
Solution Approach 1:
The system is divided into a main body containing the temperature sensor and a separate column cartridge. This segmentation allows the sensor to be integrated into the reusable main body rather than the disposable column, simplifying the overall device structure while maintaining measurement accuracy.
Solution Approach 2:
The column oven-side heat block serves multiple functions: it acts as a thermal coupling element between the column oven and the column-side heat block, and also serves as a mounting structure for the temperature sensor. This multi-functionality reduces device complexity by consolidating components.
3Temperature
If heat transfer between column oven-side heat block and column-side heat block is ensured, then temperature control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system uses temperature sensors to monitor the temperature of the column-side heat block and provides feedback to the control unit. The control unit adjusts the heating power based on this feedback, compensating for any imperfections in the heat transfer contact and maintaining accurate temperature control without requiring extremely high manufacturing precision.
Solution Approach 2:
The system dynamically adjusts the heating power parameter based on temperature measurements. By changing the power input to the heater according to the measured temperature, the system can compensate for variations in heat transfer efficiency caused by manufacturing tolerances, maintaining stable temperature control.
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
Enables precise temperature management of the analysis column while minimizing environmental impact by avoiding the disposal of sensors and heaters with column replacements.
Implementation Method 1
a column oven-side heat block configured to be brought into contact with the column-side heat block to transfer heat to the column-side heat block
Implementation Method 2
a first temperature sensor that measures a temperature of the column oven-side heat block
Implementation Method 3
a second temperature sensor that measures a temperature of an inside of the column cartridge
Data Source
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AI summary
There is provided a liquid chromatograph that is capable of accurately managing and controlling the temperature of an analysis column while suppressing an increase in environmental loads. This liquid chromatograph device includes a column cartridge including a column-side heat block configured to transfer heat to an analysis column, and a main body configured to mount the column cartridge, the main body including a column oven-side heat block configured to be brought into contact with the column-side heat block to transfer heat to the column-side heat block. The main body includes a first temperature sensor that measures a temperature of the column oven-side heat block, a second temperature sensor that measures a temperature of an inside of the column cartridge, and a determining unit that determines whether the column oven-side heat block is in contact with the column-side heat block according to a measured result of the first temperature sensor and a measured result of the second temperature sensor.