Temperature Transmitter Sensor Stress Diagnostics
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Solution Overview
Problem
Temperature sensors in industrial process transmitters degrade over time, especially when exposed to excessive temperatures, leading to inaccurate readings and potential failure, which can go unnoticed without proper diagnostic measures.
Innovation Solution
A temperature transmitter with diagnostic circuitry that monitors excessive temperature events, stores this information in memory, and uses it to diagnose the sensor's condition, predicting potential failures and compensating for measurement errors by tracking the number, duration, and severity of these events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature sensor operates continuously in industrial processes, then the productivity is improved, but the sensor degrades over time due to excessive temperatures leading to measurement inaccuracies
Solution Approach 1:
The diagnostic circuitry performs preliminary monitoring of excessive temperature events and stores this information in memory before the sensor actually fails. This allows the system to predict potential failures and compensate for degradation trends in advance, maintaining measurement accuracy throughout the sensor's operational life rather than waiting for failure to occur
Solution Approach 2:
The system implements feedback by continuously monitoring the temperature sensor's exposure to excessive temperatures, storing this diagnostic information, and using it to assess sensor condition. This feedback loop enables the system to detect degradation trends and take corrective actions such as compensating for measurement errors or scheduling maintenance before complete failure occurs
2Adaptability or versatility
If the sensor is exposed to excessive temperatures, then the industrial process can be monitored at extreme conditions, but the sensor experiences accelerated degradation and potential failure
Solution Approach 1:
The system performs preliminary diagnostics by monitoring and counting excessive temperature events before they cause complete sensor failure. The diagnostic circuitry tracks the number, duration, and severity of temperature excursions and stores this information in memory, allowing prediction of remaining sensor life and proactive replacement scheduling
Solution Approach 2:
The system provides beforehand cushioning by implementing diagnostic circuitry that detects and records excessive temperature exposure events. This creates a buffer of diagnostic information that allows the system to compensate for degradation effects and plan maintenance before the sensor actually fails, cushioning against the harmful effects of extreme temperature exposure
3Device complexity
If no diagnostic measures are implemented, then the device complexity is reduced, but the sensor degradation goes unnoticed leading to undetected measurement errors
Solution Approach 1:
The temperature transmitter performs self-diagnosis through integrated diagnostic circuitry that automatically monitors excessive temperature events, stores this information in memory, and assesses sensor condition without requiring external diagnostic equipment or additional power sources. This self-service capability maintains measurement precision by detecting degradation while adding minimal complexity to the overall system
Data Source
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Figure 2B
AI summary
A temperature transmitter (10) for sensing a temperature of an industrial process includes a temperature sensor arranged to provide a sensor (18) output related to the temperature of the industrial process. Measurement circuitry (26, 28) is coupled to the temperature sensor (18) and configured to determine the temperature of the industrial process based upon the sensor output. Output circuitry (24) provides an output related to the measured temperature. A memory (24) is configured to store temperature information related to excessive temperature events experienced by the temperature sensor (18). Diagnostic circuitry (22) diagnoses a condition of the temperature sensor (18) or other components based upon the stored temperature information (30).