Exhaust Gas Measurement Device Flow Rate Sensor
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Solution Overview
Problem
Existing exhaust gas measurement devices inform users of measurement impossibility only when a significant issue, such as filter clogging or pump failure, causes complete disruption, leading to interrupted and useless measurements.
Innovation Solution
Incorporating a flow rate sensor on the bypass flow line to detect a reduction in sample gas flow rate, triggering an attention-attracting display when the flow rate falls below a predetermined threshold, allowing for proactive maintenance before continuous measurement becomes impossible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure regulator is used to maintain set pressure value in the sensor flow line, then measurement accuracy is improved, but the user cannot detect abnormalities until measurement becomes completely impossible
Solution Approach 1:
The flow rate sensor detects changes in sample gas flow rate before the pressure regulator can no longer maintain the set pressure value. By monitoring flow rate as a leading indicator, the system performs preliminary detection of abnormalities (such as filter clogging) before they reach the critical point where measurement becomes impossible, allowing users to schedule maintenance proactively.
Solution Approach 2:
The system continuously monitors the flow rate of sample gas through the bypass flow line and provides real-time feedback to the display unit. When the flow rate deviates from the normal range, the system immediately informs the user, creating a feedback loop that enables timely detection and response to abnormalities without waiting for complete measurement failure.
2Device complexity
If maintenance is performed only when measurement becomes impossible, then device complexity is reduced, but measurement interruptions and data loss occur
Solution Approach 1:
By detecting flow rate changes that precede measurement failure, the system enables users to perform maintenance at optimal intervals before measurement becomes impossible. This preliminary detection capability allows proactive scheduling of maintenance activities, ensuring measurement continuity and preventing data loss without requiring complex real-time intervention systems.
3Stress or pressure
If the bypass flow line is used to maintain pressure, then the pressure regulator can function properly, but the user cannot anticipate when pressure control will fail
Solution Approach 1:
The flow rate sensor provides continuous feedback on the actual flow conditions in the bypass flow line. By monitoring flow rate deviations and displaying them to the user, the system makes the hidden state of the pressure control system visible, allowing users to predict when pressure control will fail based on trending flow rate changes rather than waiting for sudden failure.
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 users to anticipate and prevent measurement interruptions by alerting them to impending pressure control failures, allowing for timely maintenance and avoiding useless data loss.
Implementation Method 1
a flow rate sensor provided on the bypass flow line and adapted to measure a flow rate of the sample gas flowing through the bypass flow line
Data Source
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AI summary
Before a pressure control by a pressure regulator becomes impossible and exhaust gas cannot be continuously measured, in order for a user to be able to expect a time of occurrence of such a malfunction so that the user can perform maintenance of such as a filter and a pump before the measurement becomes completely impossible and interruption of the measurement during the measuring operation can be prevented, an exhaust gas measurement device includes: a pressure regulator 331 for keeping a pressure of sample gas in a sensor flow line 32 or a bypass flow line 33 to be a set pressure value; a flow rate sensor 332 provided on the bypass flow line 33 for measuring a flow rate of the sample gas flowing through the bypass flow line; and an attention attracting part 41 for displaying that the flow rate of the sample gas is reduced in the case where the flow rate measurement value measured by the flow rate sensor 332 becomes equal to or smaller than an attention attracting flow rate value larger than a pressure controlling limit flow rate value by a predetermined value, the pressure controlling limit flow rate value being a lower limit flow rate value that is pressure-controllable by the pressure regulator 331.