Water Quality Analyzer Pressure-Based Combustion Tube Diagnostics
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Solution Overview
Problem
Existing water quality analyzers face challenges in detecting abnormalities in the sample injector and combustion tube, leading to incorrect measurement values, which are difficult to diagnose without disassembling the device, and installing additional sensors increases cost.
Innovation Solution
A water quality analyzer equipped with a pressure sensor and temperature sensor to monitor fluctuations immediately after sample injection, determining the normalcy of the sample injector and combustion tube based on pressure and temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow sensor is installed to detect carrier gas leakage, then the ability to detect combustion tube abnormalities is improved, but the device cost increases
Solution Approach 1:
The patent introduces a pressure sensor as an intermediary device to detect abnormalities in the combustion tube. Instead of directly detecting carrier gas leakage, the system measures pressure changes in the combustion tube that result from sample injection and combustion processes. This intermediary approach enables abnormality detection without requiring complex flow sensors, thereby maintaining reliability while controlling device cost.
Solution Approach 2:
The patent replaces the proposed flow sensor mechanism with a pressure-based detection system. By substituting the mechanical flow measurement approach with pressure change monitoring, the system achieves the same abnormality detection function using simpler, more cost-effective components that are already part of the combustion tube assembly.
2Reliability
If the combustion tube is taken out for checking, then the ability to detect combustion tube abnormalities is improved, but the time required and labor intensity increase
Solution Approach 1:
The patent enables the combustion tube to perform self-diagnosis through integrated pressure sensing. The combustion tube monitors its own operational state by detecting pressure changes during sample injection and combustion, automatically identifying abnormalities such as leaks or blockages without requiring removal from the instrument. This self-service capability eliminates time-consuming manual inspection while maintaining high detection accuracy.
Solution Approach 2:
The system performs preliminary abnormality detection by continuously monitoring pressure changes during normal operation. Rather than waiting for manual inspection after the fact, the pressure sensor detects abnormalities in real-time during the combustion process, allowing for immediate identification and response to issues before they affect measurement accuracy.
3Difficulty of detecting and measuring
If temperature or pressure monitoring is used to detect sample injection, then the ability to detect sample injection status is improved, but the ability to detect combustion tube abnormalities remains insufficient
Solution Approach 1:
The patent employs dynamic pressure monitoring that captures pressure changes at multiple stages of the combustion process. By analyzing the temporal pattern and magnitude of pressure variations during sample injection, combustion, and gas flow, the system can distinguish between normal operational fluctuations and abnormalities in the combustion tube. This dynamic approach enhances both sample injection detection and combustion tube abnormality detection using the same pressure sensing mechanism.
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 rapid detection of abnormalities in the sample injector and combustion tube, reducing labor-intensive diagnostics and maintaining accurate measurement results without increasing device cost.
Implementation Method 1
When a liquid sample is injected into the combustion tube heated to a high temperature, water is instantly vaporized in the combustion tube and the volume expands
Implementation Method 2
water is instantly vaporized in the combustion tube and the volume expands, and the pressure in the combustion tube increases rapidly
Implementation Method 3
the temperature inside the combustion tube decreases due to the heat of vaporization of the liquid sample
Implementation Method 4
a carbon component contained in the sample is converted to carbon dioxide by the action of the oxidation catalyst
Implementation Method 5
combustion oxidation type total organic carbon measuring device
Data Source
Figure 1
Figure 2
AI summary
A water quality analyzer includes a combustion tube (2) for burning a liquid sample inside, a sample injector (6; 8) that executes sample injection operation into the combustion tube (2), a pressure sensor (28) that detects pressure inside the combustion tube (2), a temperature sensor (38) that detects a temperature of the combustion tube (2), and a determination part (46) configured to determine whether the combustion tube (2) and/or the sample injector (6; 8) is normal or abnormal based on an output of the pressure sensor (28) and an output of the temperature sensor (38) immediately after the sample injection operation by the sample injector (6; 8) is executed.