Capacitive Transmitter Integrating Vibration Detection
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Solution Overview
Problem
Industrial process equipment experiences vibration-induced degradation and failure, necessitating improved diagnostic technologies for early detection and prevention of component failures in industrial process control systems.
Innovation Solution
A transmitter with a diaphragm-based sensor that measures both line pressure and vibrations using capacitance changes, allowing for predictive diagnostics of process device failures by monitoring and analyzing vibration signals in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate vibration sensors are placed on process devices, then vibration detection capability is improved, but device complexity and installation requirements increase
Solution Approach 1:
The patent combines vibration sensing capability with the pressure transmitter by integrating a vibration sensor within the transmitter housing. The sensor detects vibrations through the process coupling mechanism, allowing simultaneous pressure and vibration measurements from a single device rather than requiring separate sensors.
Solution Approach 2:
The pressure transmitter is designed to perform multiple functions: it measures process pressure through the diaphragm and cavity mechanism while simultaneously detecting vibrations through the integrated vibration sensor. This multi-functional approach eliminates the need for separate dedicated vibration monitoring devices.
2Measurement precision
If multiple separate sensors are used for pressure and vibration measurement, then measurement accuracy is improved, but installation complexity and maintenance requirements increase
Solution Approach 1:
The patent integrates both pressure sensing and vibration detection functions into a single transmitter unit. The pressure measurement uses the diaphragm-cavity-electrode system while vibration sensing is achieved through an integrated sensor that detects mechanical vibrations through the process coupling, eliminating the need for multiple separate installations.
3Reliability
If vibration sensors are placed directly on process devices, then early failure detection is improved, but the risk of vibration-induced damage to the sensor increases
Solution Approach 1:
The patent uses the process coupling mechanism and transmitter housing as an intermediary between the harsh process environment and the sensitive vibration sensor. The sensor is positioned within the protected transmitter body rather than directly exposed to process conditions, allowing vibration detection while shielding the sensor from extreme temperatures, pressures, and corrosive materials.
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 early detection and prediction of impending failures, reducing downtime and maintaining plant integrity by providing timely maintenance opportunities and preventing damage to equipment and piping.
Implementation Method 1
A diaphragm in the cavity is configured to isolate a portion of the cavity from the process fluid and to move in response to pressure applied by the process fluid
Implementation Method 2
A first electrode in the isolated portion of the cavity is configured to form a first capacitance with the diaphragm. A second electrode in the isolated portion of the cavity is configured to form a second capacitance with the diaphragm
Data Source
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AI summary
A transmitter (12) for use in an industrial process control system (10), includes a process coupling (75) configured to couple to a process fluid. A sensor housing (100) has a cavity (102) formed therein which is in fluidic communication with the process fluid. A diaphragm (104) in the cavity (102) isolates a portion (108) of the cavity from the process fluid and moves in response to pressure applied by the process fluid. A first electrode (120) in the isolated portion (108) of the cavity (102) is configured to form a first capacitance with the diaphragm (104) and a second electrode (122) in the isolated portion (108) of the cavity configured to form a second capacitance with the diaphragm (104). Measurement circuitry (74) coupled to the first and second capacitance measures a pressure P of the process fluid based upon at least one of the first capacitance and second capacitance. The measurement circuitry (74) further configured to measure vibrations (70) in the process fluid based upon at least one of the first capacitance and second capacitance.