Vibration Transducer Pressure Difference Measurement
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Solution Overview
Problem
Existing measuring systems for pressure difference in flowing media, particularly in industrial processes, require complex modifications and additional sensors, leading to increased construction and calibration efforts due to the complexity of physical-mathematical models needed for accurate measurement.
Innovation Solution
A compact measuring device, such as a Coriolis mass flow rate measuring system, uses established vibration-type transducers and converter electronics to determine pressure differences by analyzing Reynolds numbers and phase differences between primary signals from inlet and outlet vibrations of the measuring tube, allowing for precise measurement of pressure differences using internal operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional pressure sensors and complex physical-mathematical models are used to measure pressure difference, then measurement precision is improved, but device complexity and calibration effort increase
Solution Approach 1:
The vibration-type transducer is designed to perform multiple functions: it measures mass flow rate, density, and now pressure difference through Reynolds number analysis. By utilizing the existing vibrating measuring tube and sensor system for multiple measurement purposes, the patent eliminates the need for separate pressure sensors while expanding measurement capabilities.
Solution Approach 2:
The system uses its own internal operating parameters (vibration frequency, phase difference between inlet and outlet signals) to determine the Reynolds number and calculate pressure difference. This self-service approach allows the transducer to measure pressure difference without external additional sensors, using data already collected during normal operation.
2Measurement precision
If additional pressure sensors are installed to measure pressure difference, then measurement precision is improved, but construction effort and cost increase
Solution Approach 1:
The vibration-type transducer is designed to perform multiple functions: it measures mass flow rate, density, and now pressure difference through Reynolds number analysis. By utilizing the existing vibrating measuring tube and sensor system for multiple measurement purposes, the patent eliminates the need for separate pressure sensors while expanding measurement capabilities.
3Measurement precision
If complex physical-mathematical models are used for pressure difference measurement, then measurement precision is improved, but calibration effort and time increase
Solution Approach 1:
The patent utilizes changes in vibration parameters (frequency, phase difference) of the measuring tube as the medium flows through it. By monitoring how these parameters change with flow conditions, the system calculates the Reynolds number and derives pressure difference, enabling accurate measurement without extensive calibration procedures.
Solution Approach 2:
The system continuously monitors the phase difference between inlet and outlet vibration signals and uses this feedback to calculate the Reynolds number and pressure difference in real-time. This feedback mechanism allows the system to adapt to changing flow conditions automatically, reducing the need for manual recalibration.
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 enables precise measurement of pressure differences and alarms for critical states like cavitation, reducing the need for complex modifications and additional sensors, and maintaining accuracy across a wide Reynolds number range.
Implementation Method 1
to determine characteristic measured variables of media flowing in a process line, for example a pipeline, for example liquids and/or gases , which induce reaction forces, for example Coriolis forces, in the flowing medium by means of a vibration-type measuring transducer
Implementation Method 2
a first vibration sensor, for example electrodynamic, for detecting vibrations, for example on the intake side, of at least the at least one measuring tube and for generating vibrations, for example on the intake side, of at least the at least one measuring tube representing the first primary signal
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
The measuring system comprises a vibration-type transducer (MW) through which a medium flows when the transducer is operated and which produces primary signals that correspond to parameters of the flowing medium, especially a mass flow rate, a density and/or a viscosity, and a transducer electronic system (ME) electrically coupled to the transducer for controlling the transducer and for evaluating the primary signals supplied by the transducer. The transducer comprises at least one measuring tube (10; 10') for carrying a flowing medium, at least one electro-mechanical vibration stimulator for stimulating and/or maintaining vibrations of the at least one measuring tube, a first vibration sensor (51) for detecting inlet-side vibrations at least of the at least one measuring tube and for producing a first primary signal (S1) of the transducer representing vibrations at least of the at least one measuring tube, and a second vibration sensor (52) for detecting outlet-side vibrations at least of the at least one measuring tube and for producing a second primary signal (S2) of the transducer representing vibrations at least of the at least one measuring tube. The transducer electronics supplies at least one driver signal (iexc) for the vibration stimulator effecting vibrations of the at least one measuring tube and uses the first primary signal and the second primary signal as well as a Reynolds number measured value representing a Reynolds number, Re, for medium flowing in the transducer to produce a pressure differential measured value (X?p) which represents a pressure difference occurring in the flowing medium between two defined reference points.