Integrated Heating Controller With Self-Diagnostic Sensor Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current heating control systems in chemical and petrochemical plants lack effective means to detect malfunctions, particularly in temperature limiters, which can lead to unsafe conditions due to undetected errors such as incorrect sensor installation or electrical issues, resulting in potential explosions.
Innovation Solution
A heating control system with a temperature controller and limiter connected via a data communication line, allowing for periodic querying and comparison of temperature values against an expected profile to detect deviations and issue alarms, thereby ensuring safe operation and detecting malfunctions like a hanging or poorly insulated temperature sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature limiters are installed in heating control systems to ensure safety, then safety is improved, but the complexity of the system increases due to additional devices and installation requirements
Solution Approach 1:
The patent combines the temperature limiter and temperature controller into a single integrated device. The temperature limiter function is merged with the temperature controller, sharing common components such as the microprocessor, temperature sensor, and housing. This integration maintains the safety function while reducing system complexity by eliminating separate devices and reducing the number of connections and installation steps.
Solution Approach 2:
The integrated device performs multiple functions: it acts as both a temperature controller for regulating heating and a temperature limiter for safety protection. The single device can operate in different modes (control mode and safety mode) based on the setpoint temperature, eliminating the need for separate dedicated limiter and controller devices while maintaining both functions.
2Reliability
If separate temperature controllers and limiters are used, then functional independence is improved, but the difficulty of detecting and measuring malfunctions increases
Solution Approach 1:
The integrated device incorporates a self-diagnostics system that continuously monitors the temperature sensor signals and heating element status. The microprocessor compares expected temperature profiles with actual measurements and can detect malfunctions such as sensor failures, insulation issues, or communication errors. This feedback mechanism enables automatic detection of problems that would otherwise be difficult to identify in separate devices.
Solution Approach 2:
The system performs self-testing and self-diagnosis functions, automatically detecting malfunctions without requiring external monitoring equipment or manual inspection. The integrated device can identify issues such as hanging sensors, insufficient thermal insulation, or electrical faults through built-in diagnostic routines that compare measured values against expected operational parameters.
3Reliability
If periodic manual checking of temperature limiter sensors is performed, then malfunction detection is improved, but the loss of time and productivity increases
Solution Approach 1:
The system performs continuous monitoring of temperature sensor readings and system operation rather than relying on periodic manual checks. The microprocessor continuously compares actual temperature measurements with expected values and can immediately detect deviations indicating malfunctions. This continuous automated monitoring eliminates the need for time-consuming periodic manual inspections while maintaining high reliability.
Solution Approach 2:
The patent replaces manual mechanical inspection procedures with automated electronic monitoring and diagnostic systems. Instead of physically checking sensor installations and measurements periodically, the system uses electronic sensors, microprocessors, and communication protocols to automatically detect and report malfunctions in real-time, significantly reducing the time and labor required for maintenance.
Data Source
Figure 1a~1d
Figure 2
Figure 3
AI summary
The controller has a temperature regulator and a temperature delimiter that are connected to each other by a data communication line. The data communication line transmits temperature data from the temperature delimiter to the temperature regulator, where the temperature delimiter comprises a microprocessor. Sampled temperature values of the temperature delimiter are compared with temperature gradient of a heating element e.g. heating pipeline (8). An alarm is output if the sampled temperature values deviate more than a predetermined extent from the expected temperature gradient. An independent claim is also included for a method for functional testing of a heating controller.