Ensuring the long-term reliability of backup sensors requires comprehensive management through three aspects: regular rotation, environmental protection, and health monitoring. This is especially important in the high-temperature and high-humidity environment of Wuhan, preventing moisture absorption, oxidation, or performance degradation due to prolonged idleness.
1. Regular Rotation Mechanism (Activating Backup Channels)
Primary and backup sensors are rotated quarterly: The original backup sensor is switched to the working channel, while the original primary sensor is used as backup, avoiding contact oxidation or internal aging caused by prolonged power outages in the backup.
Post-Rotation Calibration: After each rotation, a step response test is run to update the time constant T and AI model parameters, ensuring control accuracy.
Record Rotation History: An electronic "Rotation Log" is generated, including time, operator, resistance value, and insulation status, enabling traceability.
2. Enhanced Environmental Protection (Addressing High Humidity Challenges)
|
Protective Measures |
Implementation Standards |
Function |
|
IP67-rated Aviation Connector + Anti-rust Coating |
Prohibits the use of ordinary plastic connectors; mandates the use of metal-plated interfaces |
Prevents oxidation and corrosion of wiring terminals. |
|
Nano-coated Tri-proof Coating |
Full coverage of connectors and cable connections |
Blocks moisture intrusion. |
|
Miniature Heating Element Anti-condensation |
A 5W heating element is installed inside the junction box; automatically activates when humidity > 70%RH |
Maintains internal dryness. |
|
Nitrogen Purge Linkage |
Automatic 3-minute purging upon shutdown |
Removes residual moisture and dust. |
3. Continuous Health Status Monitoring (Preventative Maintenance)
Monthly Power-On Self-Test: The backup sensor is temporarily connected to the system to read resistance, temperature drift, and noise levels to confirm data stability.
AI Health Weight Pre-Assessment: The PHM system simulates the sensor's operating status based on historical data. If the predicted weight is <0.8, it indicates the need for early replacement.
Infrared Temperature Measurement Comparison Verification: While the main sensor is operating, an infrared gun scans the corresponding points to verify the reliability of the backup sensor if it is activated.
Engineering Value: Jiangsu Kangfeite improved the availability of backup channels to 99.6% through monthly self-tests.
