Vibronic Mass Flow Sensor External Magnetic Field Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Coriolis mass-flow-rate measuring devices face challenges in accurately measuring mass flow rates due to the influence of external magnetic fields, which can cause phase errors and reduce measurement accuracy.
Innovation Solution
The proposed vibronic measuring system includes a Coriolis mass-flow-rate measuring device with a magnetic-field detector, such as a Hall sensor or reed switch, positioned outside the sensor housing to detect external magnetic fields. The system uses electrodynamic vibration sensors and an oscillation exciter to maintain useful vibrations, and the measuring-system electronics processes signals from both vibration sensors and the magnetic-field detector to determine mass-flow-rate measurements and detect magnetic field influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external magnetic fields are present in the measurement environment, then the measuring system can operate continuously, but measurement precision deteriorates due to phase errors
Solution Approach 1:
A magnetic field detector is introduced as an intermediary component between the external magnetic field and the vibration sensors. The detector senses the external magnetic field and provides this information to the evaluation electronics, which then compensate for the field's influence on the measurement signals, thereby maintaining precision while allowing continuous operation.
Solution Approach 2:
The system implements feedback by continuously monitoring the external magnetic field through the magnetic field detector and using this information to adjust the evaluation of vibration signals. The evaluation electronics receive real-time data about the magnetic field conditions and modify their signal processing accordingly, creating a closed-loop system that maintains measurement accuracy despite environmental variations.
2Measurement precision
If magnetic field detection functionality is added to the measuring system, then measurement precision is maintained in the presence of external magnetic fields, but device complexity increases
Solution Approach 1:
The magnetic field detector is designed to serve multiple purposes: it detects external magnetic fields for compensation, and can potentially serve as part of the vibration sensing system. By making components multi-functional, the system achieves enhanced precision without proportionally increasing complexity.
Solution Approach 2:
The magnetic field detection functionality is integrated into the existing sensor housing and evaluation electronics rather than being a completely separate system. The detector is positioned within or near the sensor housing, and its signals are processed by the existing evaluation electronics, merging multiple functions into a unified system that minimizes additional complexity.
3Ease of operation
If a magnetic field detector is positioned outside the sensor housing, then the detector is protected from direct contact with the measurement medium, but the detection of external magnetic fields becomes more challenging
Solution Approach 1:
The magnetic field detector is positioned in a different spatial dimension relative to the measurement medium - outside the sensor housing rather than inside. This spatial separation protects the detector from direct contact with the measurement medium while still allowing it to detect external magnetic fields through the housing material, which acts as a transparent medium for magnetic field penetration.
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 solution enables the timely detection and reporting of external magnetic field influences, thereby reducing measurement errors and maintaining the accuracy of mass flow rate measurements in Coriolis mass-flow-rate measuring devices.
Implementation Method 1
at least one first magnetic-field detector (61) for sensing a magnetic field that is established inside the measuring system
Implementation Method 2
a magnetic-field detector, such as a Hall sensor or reed switch
Implementation Method 3
an electrodynamic first vibration sensor (51) and at least one electrodynamic second vibration sensor (52), for example structurally identical to the first vibration sensor, for sensing mechanical oscillations of the at least one vibration element
Implementation Method 4
at least one oscillation exciter (41) for exciting and maintaining mechanical oscillations of the at least one vibration element (10)
Data Source
AI summary
The measuring system comprises a vibration-type measuring sensor, a sensor housing, a magnetic-field detector, and measuring-system electronics electrically coupled both to an oscillation exciter and to oscillation-sensing devices of the measuring sensor. The measuring sensor is inside the sensor housing and the magnetic-field detector is outside the sensor housing. The magnetic-field detector is designed to convert changes in the magnetic field into a magnetic-field signal having an amplitude dependent on a magnetic flux through the magnetic-field detector and/or on an area density of said magnetic flux. The measuring-system electronics are designed to determine, on the basis of oscillation measurement signals of the measuring sensor, the mass-flow-rate measurement values representing the mass flow rate and to at least qualitatively determine, on the basis of the magnetic-field signal, whether an external magnetic field is established inside the measuring sensor.