Vibrating Meter Fluid Switch Zero Offset Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vibrating meters, particularly Coriolis flow meters, face challenges in accurately determining zero flow conditions due to changes in zero offset caused by entrained gas and partial filling, leading to false measurements during bunkering processes, where existing methods are inadequate in ensuring reliable and accurate flow measurement cessation.
Innovation Solution
The implementation of one or more fluid switches proximate to the vibrating meter to detect fluid presence and flow conditions, allowing the meter electronics to determine when to stop totalizing measurements, thereby preventing false readings by correcting for changes in zero offset and fluid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid switches are added to detect fluid presence and flow conditions, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
Fluid switches are introduced as intermediary devices that detect fluid presence and flow conditions upstream and downstream of the vibrating meter. These switches act as mediators between the actual flow state and the meter's measurement system, providing additional information to determine when to stop totalizing measurements and preventing false readings caused by entrained gas or partial filling conditions.
2Productivity
If the meter continues to measure after flow cessation, then productivity is improved, but measurement precision deteriorates due to false readings
Solution Approach 1:
The system implements feedback by continuously monitoring fluid presence and flow conditions using upstream and downstream fluid switches. When the downstream switch detects fluid presence after the upstream switch signals flow cessation, the system receives feedback indicating false flow conditions and stops totalizing measurements, thereby maintaining measurement precision without unnecessarily interrupting productive measurement periods.
3Measurement precision
If zero offset correction is applied, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary action by detecting changes in zero offset conditions through fluid switch signals before false measurements are generated. When fluid switches indicate conditions consistent with zero flow (such as fluid presence downstream after upstream flow cessation), the electronics proactively correct or suspend measurements, preventing inaccurate readings without requiring complex real-time analysis of every measurement parameter.
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 effectively prevents false measurements by accurately determining when flow has ceased, even in the presence of entrained gas or partial filling, enhancing the reliability and accuracy of vibrating meter readings, particularly in bunkering applications.
Implementation Method 1
a first fluid switch proximate to and upstream from the sensor assembly and a second fluid switch proximate to and downstream from the sensor assembly
Implementation Method 2
As material begins to flow through the sensor assembly, Coriolis forces cause each point along the conduit(s) to have a different phase
Implementation Method 3
Each conduit configuration in a Coriolis mass flow meter has a set of natural vibration modes, which may be of simple bending, torsional, or coupled type. Each conduit can be driven to oscillate at a preferred mode.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A meter electronics (20) for a vibrating meter (5) is provided. The vibrating meter (5) includes a sensor assembly located within a pipeline (301). The sensor assembly (10) is in fluid communication with one or more fluid switches (309). The meter electronics (20) is configured to measure one or more flow characteristics of a fluid flowing through the sensor assembly (10). The meter electronics (20) is further configured to receive a first fluid switch signal (214) indicating a fluid condition within the pipeline (301) from a first fluid switch (309) of the one or more fluid switches. The meter electronics (20) is further configured to correct the one or more flow characteristics if the fluid condition is outside a threshold value or band.