Gas Chromatograph Automatic Shutdown Cooling Control
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Solution Overview
Problem
Manual parameter setting in gas chromatographs can lead to operator errors, resulting in unnecessary carrier gas consumption and potential damage to columns and detectors, especially thermal conductivity detectors, due to inadequate temperature control during power shutdown.
Innovation Solution
A gas chromatograph equipped with temperature sensors and a control unit that automatically adjusts the carrier gas flow rate and power supply based on detected temperatures, ensuring the column, detector, and sample vaporization chamber are cooled before power shutdown, thereby reducing gas consumption and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier gas is continuously supplied after power shutdown to protect the column, then the column is protected from damage, but carrier gas is wastefully consumed
Solution Approach 1:
The system performs preliminary cooling of the column and detector before stopping the carrier gas supply. The control unit monitors temperatures and only stops the carrier gas when both the column and detector have cooled below their respective reference temperatures, preventing damage while avoiding wasteful consumption.
Solution Approach 2:
The system uses temperature sensors to continuously monitor the column and detector temperatures, and the control unit adjusts the carrier gas supply based on this feedback. The carrier gas is stopped only when temperature feedback confirms both components have cooled sufficiently, resolving the contradiction between protection and consumption.
2Loss of substance
If operator manually sets parameters to reduce carrier gas flow rate and column temperature, then carrier gas consumption is reduced, but setting mistakes may occur causing damage to column or detector
Solution Approach 1:
The system performs self-service by automatically monitoring temperatures and controlling carrier gas supply based on pre-set reference temperatures. The control unit independently determines when to stop the carrier gas without operator intervention, eliminating setting mistakes while optimizing gas consumption.
Solution Approach 2:
The system changes operational parameters (carrier gas flow rate, column temperature, detector temperature) based on temperature thresholds. When the detector and column cool below reference temperatures, the system automatically changes the carrier gas flow from continuous supply to stopped supply, ensuring safe operation while reducing consumption.
3Reliability
If operator carefully sets parameters to prevent damage to detector and column, then damage is prevented, but work is complicated and time-consuming
Solution Approach 1:
The system performs self-service by automatically monitoring temperatures and controlling carrier gas supply based on pre-set reference temperatures. The control unit independently determines when to stop the carrier gas without operator intervention, eliminating setting mistakes while optimizing gas consumption.
Solution Approach 2:
The system uses temperature sensors to continuously monitor the column and detector temperatures, and the control unit adjusts the carrier gas supply based on this feedback. The carrier gas is stopped only when temperature feedback confirms both components have cooled sufficiently, resolving the contradiction between protection and consumption.
4Loss of substance
If carrier gas flow rate is rapidly reduced to save gas, then carrier gas consumption is reduced, but the detector may be damaged due to high temperature
Solution Approach 1:
The system performs preliminary cooling of the column and detector before stopping the carrier gas supply. The control unit monitors temperatures and only stops the carrier gas when both the column and detector have cooled below their respective reference temperatures, preventing damage while avoiding wasteful consumption.
Solution Approach 2:
The system uses temperature sensors to continuously monitor the column and detector temperatures, and the control unit adjusts the carrier gas supply based on this feedback. The carrier gas is stopped only when temperature feedback confirms both components have cooled sufficiently, resolving the contradiction between protection and consumption.
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
The automatic control system effectively reduces carrier gas consumption, minimizes the time and effort required for manual parameter setting, and prevents damage to the column and detector by ensuring they are cooled before power shutdown, enhancing operational safety and efficiency.
Implementation Method 1
The first temperature sensor detects the temperature of the column
Implementation Method 2
The second temperature sensor detects the temperature of the detector
Implementation Method 3
the temperature of the column is sufficiently lowered
Implementation Method 4
the temperature of the detector detected by the second temperature sensor is not higher than a second reference temperature
Data Source
AI summary
A gas chromatograph is provided which is capable of effectively reducing the amount consumed of a carrier gas, reducing the time and effort required for an operator to manually set parameters, and preventing damages to a column and a detector due to a setting mistake. In a case where a stop operation for the power supply of the gas chromatograph is performed (Yes in step S101), the flow rate of a carrier gas to be supplied to a sample vaporization chamber is decreased and the temperatures of the column and the detector are sufficiently lowered (steps S102 to S104), and then the power supply of the gas chromatograph is switched over from an ON state to an OFF state (step S106).