Vibration Flow Meter Temperature Compensation
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Solution Overview
Problem
Conventional vibronic measuring systems face challenges in accurately determining converter device temperature, leading to erroneous measurement results due to limited temperature measurement points and dynamic heat equalization processes, especially in areas with high vibration amplitudes and mechanical loads.
Innovation Solution
A measuring system with two temperature sensors, one on each tube, positioned to detect temperatures at measuring points less far from the ends, generating a converter temperature value that represents a spatially averaged temperature, reducing mechanical loads and improving metrological compensation of temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are positioned in areas with high vibration amplitudes to improve temperature measurement coverage, then measurement completeness is improved, but mechanical stress on sensors increases and measurement reliability deteriorates
Solution Approach 1:
The patent applies local quality by positioning temperature sensors in specific locations with lower vibration amplitudes (away from the center of the tube) rather than uniformly distributing them. This creates a localized measurement strategy where sensors are placed in thermally representative positions that minimize mechanical stress while still capturing the essential temperature distribution for compensation purposes.
2Measurement precision
If multiple temperature sensors are used to improve temperature distribution measurement, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential temperature measurement points needed for compensation by using just two sensors positioned at specific locations. Rather than instrumenting the entire tube, the invention identifies and measures only the critical temperature positions that represent the overall thermal state, thereby reducing complexity while maintaining measurement accuracy.
3Measurement precision
If temperature sensors are positioned closer to the center of the tube to capture core temperature, then temperature representativeness is improved, but mechanical loads on sensors increase
Solution Approach 1:
The patent positions temperature sensors at specific radial locations (away from the center) where the thermal conditions still provide adequate representation of the overall tube temperature while avoiding the high-stress region. This localized positioning strategy achieves a compromise that satisfies both measurement representativeness and mechanical reliability requirements.
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 configuration enhances measurement accuracy by reducing mechanical stress on temperature sensors and temperature measurement errors, allowing for improved compensation of temperature variations within the converter device.
Implementation Method 1
a first temperature sensor (71) which is coupled mechanically, albeit thermally conductively, to the wall of the first pipe (11) and is positioned less far from the first end (11a) of the same first pipe (11) than from the second end (11b) of the same first pipe (11) and is provided for detecting a first measuring point temperature (θ1), namely a temperature at a first temperature measuring point (11T1) formed by means of the same first temperature sensor (71)
Implementation Method 2
the measuring and operating electronics (ME) being set up to use both the first temperature measurement signal (Θ1) and the second temperature measurement signal (Θ2) to generate a converter temperature value (ΘMW) which represents a converter device temperature (θMW), depending on both the first measuring point temperature (θ1) and on the second measuring point temperature (θ2)
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a measuring system comprising a transducer device (MW) having two tubes (11, 12), each of which has a lumen (11') surrounded by a wall, in particular a metal wall, and which extend from respective inlet-side ends (11a, 12a) to respective outlet-side ends (11b, 12b) and which are each designed for the flow of a fluid therethrough from the respective inlet-side ends toward the respective outlet-side ends and for being vibrated during said flow. An electromechanical exciter assembly formed by means of at least one vibration exciter (41) is used to excite and maintain mechanical vibrations of each of the tubes (11, 12) about an associated static resting position, and a sensor assembly (S) formed by means of at least one vibration sensor (51) is used to sense mechanical vibrations of at least one of the tubes (11, 12). In addition, the transducer device has two temperature sensors (71, 72), wherein temperature sensor (71) is coupled mechanically yet in a thermally conductive manner to a wall of the tube (11) and temperature sensor (72) is coupled mechanically yet in a thermally conductive manner to a wall of the tube (12) and wherein each of the temperature sensors (71, 72) is designed to sense a measurement-point temperature (θ1, θ2) and to convert said measurement-point temperature into a temperature measurement signal (Θ1; Θ2). In addition, the temperature sensor (71) is positioned at a smaller distance from end (11a) than from end (11b), while the temperature sensor (72) is positioned at a smaller distance from end (12b) than from the (12a). In addition, a measuring and operating electronic unit (ME) of the measuring system, which is electrically coupled to the transducer device, is designed to generate a transducer temperature measurement value by using the temperature measurement signals (Θ1, Θ2), which transducer temperature measurement value represents a transducer device temperature, which deviates both from measurement-point temperature (θ1) and from measurement-point temperature (θ2), in such a way that the magnitude of said transducer temperature measurement value is greater than the magnitude of measurement-point temperature (θ1) yet less than the magnitude of measurement-point temperature (θ2).