Vibration Transducer Pressure Measurement
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Solution Overview
Problem
Existing measuring systems for flowable media, such as Coriolis mass flow meters, struggle to accurately measure pressure downstream of the inlet end in flowing media, which is crucial for detecting high or low pressure drops and preventing cavitation, with limited precision and effort.
Innovation Solution
A compact measuring system comprising a vibration-type transducer with an electrodynamic oscillation exciter and sensor, coupled with transmitter electronics that processes primary signals to generate pressure values and alarms for critical pressure conditions, utilizing established oscillation sensors and actuation technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measuring systems are used, then basic flow measurement is achieved, but pressure measurement downstream of the inlet end is insufficient for detecting high or low pressure drops and preventing cavitation
Solution Approach 1:
The measuring transducer is designed to perform multiple functions: it measures mass flow rate using Coriolis forces, density using oscillation frequency, and pressure downstream of the inlet end using the interaction between the oscillating measuring tube and the flowing medium. This multi-functionality allows a single device to provide comprehensive process parameters including pressure, which is essential for detecting pressure drops and preventing cavitation
Solution Approach 2:
The measuring tube is set into oscillation at its natural resonance frequency by an oscillation exciter. The oscillating measuring tube interacts with the flowing medium to generate measurable forces that provide information about the pressure downstream of the inlet end. This vibration-based measurement mechanism enables precise pressure detection without additional pressure sensors
2Measurement precision
If additional pressure sensors are added to measure pressure downstream, then measurement capability is improved, but device complexity and effort increase
Solution Approach 1:
The existing measuring transducer is enhanced to perform pressure measurement in addition to its primary functions of mass flow and density measurement. By utilizing the oscillating measuring tube's interaction with the flowing medium, the system obtains pressure information without adding separate pressure sensing components, thereby avoiding increased device complexity
Solution Approach 2:
The oscillating measuring tube serves multiple purposes: it generates Coriolis forces for flow measurement, provides frequency information for density measurement, and through its interaction with the flowing medium under pressure, provides pressure measurement capability. The system uses its own oscillating structure to generate the measurement signal rather than requiring external sensing mechanisms
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 precise and efficient measurement of pressure downstream of the inlet end, effectively detecting high or low pressure drops and impending cavitation, with minimal effort, across a broad range of Reynolds numbers for both laminar and turbulent flows.
Implementation Method 1
induce reaction forces in the flowing medium, for example, Coriolis forces, and produce, repetitively derived from these, measurement values correspondingly representing the at least one measured variable, for example, a mass flow rate
Implementation Method 2
the at least one measuring tube is caused to vibrate for the purpose of generating oscillation forms influenced by the medium flowing through the measuring tube
Implementation Method 3
the measuring tube executes, at least partially, bending oscillations essentially in a single imaginary plane of oscillation
Data Source
AI summary
The measuring system comprises: A measuring transducer of vibration-type, through which medium flows during operation and which produces primary signals corresponding to parameters of the flowing medium; as well as a transmitter electronics electrically coupled with the measuring transducer for activating the measuring transducer and for evaluating primary signals delivered by the measuring transducer. The measuring transducer includes: At least one measuring tube for conveying flowing medium; at least one electro-mechanical, oscillation exciter for exciting and/or maintaining vibrations of the at least one measuring tube; and a first oscillation sensor for registering vibrations of the at least one measuring tube and for producing a first primary signal of the measuring transducer representing vibrations at least of the at least one measuring tube. The transmitter electronics, in turn, delivers at least one driver signal for the exciter mechanism for effecting vibrations of the at least one measuring tube and generates, by means of the first primary signal and/or by means of the driver signal, as well as with application of a pressure, measured value (Xp1), which represents a first pressure, pRef, reigning in the flowing medium, a pressure, measured value (Xp2), which, in turn, represents a static second pressure, pcrit, reigning in the flowing medium.