Gas Analysis Calibration via Pressure Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas analysis apparatuses face low correction accuracy due to the use of common pressure correction factors, requiring individual calibration factors and the need for a depressurization/pressurization test chamber, which is costly and limits productivity.
Innovation Solution
A calibration method that connects a pressure varying device to the sample gas introduction and discharge ports of the gas analysis apparatus, allowing for depressurization or pressurization without a test chamber, enabling individual pressure correction factor calculation for each apparatus, improving accuracy and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common pressure correction factor is used for multiple exhaust gas analysis apparatuses, then the calibration process is simplified and productivity is improved, but the correction accuracy decreases due to variations in pressure variation characteristics among apparatuses
Solution Approach 1:
The patent divides the calibration process into two parts: a common calibration factor applied to all apparatuses, and an individual correction factor specific to each apparatus. This segmentation allows the majority of calibration to be done efficiently in common, while individual variations are accounted for through additional separate calibration steps using calibration gas cylinders, thus resolving the contradiction between productivity and accuracy.
Solution Approach 2:
The patent performs preliminary calibration to obtain a common pressure correction factor that is applicable to multiple apparatuses. This preliminary calibration establishes a baseline correction that works for all devices, and then individual apparatus-specific calibrations are performed as supplementary adjustments, enabling efficient bulk calibration while maintaining individual accuracy.
2Measurement precision
If individual pressure correction factors are obtained for each exhaust gas analysis apparatus, then the correction accuracy is improved, but the calibration process becomes complex and requires a depressurization/pressurization test chamber, reducing productivity
Solution Approach 1:
The patent extracts the individual calibration process from the requirement of using a depressurization/pressurization test chamber. By using portable calibration gas cylinders and performing calibration at the apparatus location, the complex test chamber infrastructure is removed, allowing individual calibration to be performed simply and efficiently without sacrificing accuracy or productivity.
Solution Approach 2:
The patent enables each exhaust gas analysis apparatus to be calibrated independently using its own calibration gas cylinder, without requiring external test chamber facilities. This self-service approach allows calibration to be performed at the point of use, eliminating the need for complex shared infrastructure and enabling parallel calibration of multiple apparatuses, thus maintaining high productivity while achieving individual accuracy.
3Measurement precision
If a depressurization/pressurization test chamber is used for calibration, then individual pressure correction factors can be obtained accurately, but the cost increases and the calibration process becomes cumbersome, limiting productivity
Solution Approach 1:
The patent replaces the expensive, complex, and durable test chamber infrastructure with inexpensive, portable calibration gas cylinders that can be used temporarily at the calibration location. These disposable-style calibration resources eliminate the need for costly permanent test chamber facilities while providing sufficient accuracy for individual apparatus calibration, thus resolving the contradiction between accuracy and system complexity.
Solution Approach 2:
The patent introduces calibration gas cylinders as an intermediary medium between the calibration standard and the exhaust gas analysis apparatus. Instead of using a complex test chamber environment as the intermediary, the portable gas cylinders provide a simple, direct calibration path that maintains accuracy while dramatically reducing system complexity and cost.
Data Source
AI summary
The present invention includes: connecting a pressure varying device to a sample gas introduction port and a gas discharge port of a gas analysis apparatus; depressurizing or pressurizing the sample gas introduction port and the gas discharge port by the pressure varying device; introducing calibration gas from a calibration gas introduction port of the gas analysis apparatus in a depressurized or pressurized state; and calculating a pressure correction factor for the gas analysis apparatus with use of a measurement result of the calibration gas by the gas analysis apparatus.