Coriolis Mass Flowmeter Temperature Compensation
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Solution Overview
Problem
Coriolis mass flowmeters face accuracy deterioration due to temperature deviations from the reference temperature, especially when measuring extremely cold or hot media, and existing compensation methods are inadequate for maintaining high accuracy across large temperature fluctuations.
Innovation Solution
The method accounts for both theoretical and empirical material temperature dependencies, as well as device-specific temperature influences, by determining a device-specific temperature dependency during calibration, which is then used in the calculation rule to accurately determine the mass flow rate, incorporating factors like modulus of elasticity, thermal expansion, and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mass flowmeter is calibrated at a fixed reference temperature, then the measurement accuracy is high at that temperature, but the accuracy deteriorates when the operating temperature deviates from the reference temperature
Solution Approach 1:
The patent applies parameter changes by introducing temperature-dependent correction factors that modify the calibration parameters based on the actual operating temperature. The system determines a temperature dependency parameter through calibration and uses it to adjust the measurement calculation, allowing accurate measurements across varying temperatures rather than being limited to a single reference temperature.
2Temperature
If the operating temperature deviates significantly from the reference temperature, then the mass flowmeter can measure extreme temperatures, but the measurement accuracy falls below acceptable ranges
Solution Approach 1:
The patent applies preliminary action by performing a calibration process that determines the device-specific temperature dependency parameter before actual operation. This pre-characterization of the device's temperature response allows the system to compensate for temperature effects during measurement, ensuring accuracy is maintained across the full operating temperature range rather than degrading at extreme temperatures.
3Device complexity
If only the temperature dependency of the modulus of elasticity is considered, then the calculation is simple, but the measurement accuracy is inadequate for large temperature fluctuations
Solution Approach 1:
The patent applies feedback by implementing a calibration process that measures the actual device response at different temperatures and uses this information to determine a device-specific temperature dependency parameter. This empirically-derived parameter provides feedback about the actual device behavior, allowing the system to compensate for temperature effects more accurately than theoretical models alone, while maintaining a relatively simple calculation structure.
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
This approach allows for precise mass flow rate calculations across varying temperatures, improving accuracy and enabling device-specific behavior analysis, with the possibility of detecting gradual changes over time.
Implementation Method 1
their measuring tube is excited to oscillate by a vibration generator
Implementation Method 2
Mass flowmeters based on the Coriolis principle
Implementation Method 3
the dependence of the modulus of elasticity E of the material of the measuring tube on the temperature of the measuring tube
Data Source
AI summary
The installation and operation method involves exciting a measuring tube to vibrate and determining a phase shift of the vibration of the measuring tube which is dependent on the mass flow or a time difference corresponding to phase shift. The temperature of the measuring tube is determined, and the mass flow is calculated using the determined phase shift or time difference and the determined temperature via a computation rule. The computation rule includes taking into account known theoretical or empirical material temperature dependence as well as the device-specific temperature dependence.