Gas-Tight Syringe Sampler Integrity Verification via Electrical Monitoring
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Solution Overview
Problem
Existing chemical analyzers using static headspace techniques face challenges in ensuring the integrity and precision of gas sampling due to potential leaks and contamination, particularly with systems based on gas-tight syringes, which lack mechanisms for verifying system integrity and container tightness.
Innovation Solution
An automatic sampler with gas-tight syringes equipped with measuring means for electrical voltage and current to calculate the energy required for plunger movement, allowing for the detection of any anomalies in container tightness and syringe functionality, thereby ensuring precise sampling and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gas-tight syringe systems are used for sampling, then the system is simple to operate and cost-effective, but the system lacks mechanisms for verifying integrity and tightness, leading to potential leaks and contamination
Solution Approach 1:
The system performs preliminary verification actions before actual sampling by measuring the electrical characteristics (voltage, current, power) of the syringe system in its initial state. This preliminary measurement establishes a baseline for comparing subsequent measurements during sampling, enabling detection of leaks or integrity issues before they affect the actual sample.
Solution Approach 2:
The system continuously monitors electrical parameters (voltage, current, power) during plunger movement and compares them against expected values or preliminary measurements. This feedback mechanism detects deviations that indicate leaks, contamination, or system failures, allowing real-time verification of system integrity while maintaining operational simplicity.
2Reliability
If pressure balancing systems with multiple valves are used, then system integrity can be verified, but the device complexity and cost increase significantly
Solution Approach 1:
The invention replaces complex mechanical verification systems (multiple valves, pressure sensors, regulators) with an electrical measurement system. By monitoring electrical parameters (voltage, current, power) of the plunger motor, the system derives mechanical state information without requiring additional mechanical components, thereby simplifying the overall device while maintaining verification capability.
Solution Approach 2:
The electrical measurement system serves multiple functions: it controls plunger movement, monitors system integrity, detects leaks, and verifies sampling accuracy. This multi-functional approach eliminates the need for separate verification mechanisms required in pressure-balancing systems, reducing device complexity while maintaining comprehensive monitoring.
3Reliability
If pressure measuring and regulating devices are added to verify integrity, then leak detection is possible, but the device complexity and cost increase
Solution Approach 1:
The system substitutes mechanical pressure measurement devices with electrical measurements of the plunger motor. By analyzing voltage, current, and power consumption patterns during plunger movement, the system indirectly measures mechanical resistance changes that indicate pressure variations or leaks, eliminating the need for direct pressure sensing hardware.
Solution Approach 2:
The syringe system's own electrical characteristics serve as the measurement medium. The plunger motor's power consumption naturally reflects the mechanical load and resistance it encounters, providing self-diagnostic information about system integrity without requiring external measurement devices. The system uses its operational parameters to verify its own integrity.
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 solution enables automatic verification of sampler and container integrity, preventing leaks and contamination while maintaining lower execution costs compared to pressure-balancing and pressurization systems, ensuring accurate and precise sampling for chemical analysis.
Implementation Method 1
measuring means for electrical voltage and current to calculate the energy required for plunger movement
Data Source
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Figure 6
AI summary
One sampler for chemical analyzers comprising: one gas-tight syringe (10) with a plunger (11) for sampling from containers (2) predetermined quantities of substances to carry out chamical analyses; one first movement unit (15) operatively linked to the plunger (11) in order to move it so as to carry out the sampling; measurement means (20) of the feeding electrical voltage and electrical current of the first movement unit (15) during the movement of the plunger (11); one logical control unit (21) operatively linked to the measurement means (20) to calculate the energy used for the plunger movement (11).