Intrinsically Safe Corrosion Measurement Field Device
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Solution Overview
Problem
Conventional field corrosion transmitters lack the accuracy and adaptability to measure corrosion across various structure materials, fluid types, and temperatures, making them impractical for real-time online measurement in chemical processing environments.
Innovation Solution
Development of low power field devices that utilize a power system from a 4-20 mA loop or battery, with a probe interface and signal conditioning circuitry to measure corrosion-related values like corrosion rate, electrolyte resistance, and conductivity, employing techniques such as harmonic distortion analysis, linear polarization resistance, and electrochemical noise measurement, and featuring a processing system for data computation and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional field corrosion transmitters are used, then device simplicity and ease of operation are maintained, but measurement precision and adaptability deteriorate
Solution Approach 1:
The field device is designed to perform multiple corrosion measurement techniques (LPR, HDA, ECN, SRM) within a single instrument, enabling it to adapt to various structure materials, fluid types, and temperature conditions while maintaining reasonable device complexity through integrated multi-functional architecture
Solution Approach 2:
The device incorporates dynamic measurement capabilities that can adapt measurement parameters and techniques in real-time based on the specific corrosion conditions being monitored, allowing the system to optimize measurement precision for different applications without requiring multiple fixed-function devices
2Measurement precision
If elaborate laboratory grade instrumentation is used, then measurement precision improves, but ease of operation and adaptability to field conditions worsen
Solution Approach 1:
The field device is designed to operate autonomously in harsh field environments without requiring laboratory-grade infrastructure, performing self-contained measurements and data processing while maintaining measurement precision through integrated sensing and computation capabilities
Solution Approach 2:
The device employs robust, field-hardened components designed for harsh environment operation rather than delicate laboratory instrumentation, prioritizing durability and ease of deployment over the extreme precision of lab equipment while maintaining sufficient measurement accuracy for field applications
3Productivity
If online real-time measurement is implemented, then productivity improves, but device complexity and power requirements worsen
Solution Approach 1:
The device performs measurements in periodic cycles, alternating between different measurement techniques (LPR, HDA, ECN, SRM) and data processing tasks, enabling real-time corrosion monitoring while managing power consumption and computational complexity through time-multiplexed operation
Solution Approach 2:
The system dynamically adjusts measurement frequency and technique selection based on corrosion conditions and power availability, optimizing the balance between real-time monitoring capability and device complexity for field deployment
4Use of energy by moving object
If low power operation is implemented, then ease of operation in field conditions improves, but measurement precision and functionality worsen
Solution Approach 1:
The device uses periodic measurement cycles with alternating active and low-power states, performing high-precision measurements only when necessary while maintaining monitoring capability through electrochemical noise measurement that requires minimal power
Solution Approach 2:
The system dynamically adjusts measurement parameters such as excitation signal amplitude, measurement frequency, and averaging time based on power availability and corrosion conditions, maintaining measurement precision across varying power states
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 accurate real-time corrosion measurement in field conditions, reducing the need for expensive laboratory instrumentation and providing adaptable corrosion monitoring capabilities across diverse applications.
Implementation Method 1
The signal conditioning provides one or more excitation signals to the electrolyte via a first electrode and includes sensing circuitry for sensing one or more corrosion-related electrical signals
Implementation Method 2
sensing circuitry for sensing one or more corrosion-related electrical signals such as currents, voltages, etc. via at least a second one of the electrodes
Data Source
AI summary
Corrosion measurement devices are described with electrical isolation and intrinsic safety barriers advanced corrosion measurement in a field transmitter for online corrosion monitoring or off-line corrosion data logging.