Headspace Sampler Pressure Sensor Leak Detection
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Solution Overview
Problem
Conventional headspace samplers cannot detect gas leaks from sample containers or clogging of the needle, which can lead to inaccurate analysis results.
Innovation Solution
Incorporation of a pressure sensor and on-off valves to measure pressure changes during the pressurizing process, allowing for detection of gas leaks and needle clogging by comparing measured pressure values to predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional headspace sampler is used without pressure sensors, then the device complexity is low, but the reliability of sample collection is insufficient because gas leaks or needle clogging cannot be detected
Solution Approach 1:
The pressure sensor performs preliminary detection of gas leaks or needle clogging before sample collection begins. By checking pressure changes during an initial pressurization phase, the system identifies potential problems before they affect the actual analysis, ensuring reliable sample collection without requiring complex continuous monitoring systems throughout the entire process.
Solution Approach 2:
The pressure sensor acts as an intermediary detection device that indirectly monitors the integrity of the sample collection system. Instead of directly detecting gas leaks or needle clogging, the sensor measures pressure changes in the closed space, providing an indirect but reliable indication of system integrity that triggers appropriate responses.
2Reliability
If pressure sensors and control valves are added to detect gas leaks and needle clogging, then the reliability of sample collection is improved, but the device complexity increases
Solution Approach 1:
The pressure sensor performs preliminary detection of gas leaks or needle clogging before sample collection begins. By checking pressure changes during an initial pressurization phase, the system identifies potential problems before they affect the actual analysis, ensuring reliable sample collection without requiring complex continuous monitoring systems throughout the entire process.
Solution Approach 2:
The pressure sensor acts as an intermediary detection device that indirectly monitors the integrity of the sample collection system. Instead of directly detecting gas leaks or needle clogging, the sensor measures pressure changes in the closed space, providing an indirect but reliable indication of system integrity that triggers appropriate responses.
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 accurate detection of gas leaks and needle clogging, ensuring reliable sample collection and analysis by notifying users and recording determination results.
Implementation Method 1
a pressure sensor provided at one of positions comprised of a position on the sample gas collection channel, a position on the pressure gas introduction channel and a position between the branching pipe and the second on-off valve of the exhaust channel, and for measuring a pressure in the channel at the position
Data Source
AI summary
A headspace sampler includes: a sample gas collection channel whose one end communicates with a needle; a pressure gas introduction channel and an exhaust channel that communicate with the other end of the channel in parallel via a branching pipe; a pressure control device that delivers pressure gas to the pressure gas introduction channel at a predetermined pressure; solenoid valves provided in the pressure gas introduction channel and the exhaust channel, respectively; and switching means for switching a state where a measuring pipe is inserted in the sample gas collection channel and a state where the measuring pipe is shorted away from the channel, wherein a pressure sensor is provided on an upstream side of the solenoid valve in the exhaust channel.