How to Determine if a Furnace Temperature Sensor Has Been Truly Repaired
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Standard thermocouple comparison, multi-point temperature measurement verification, and continuous furnace stability testing to guaranty stable temperature readings, a deviation ≤ ±5°C, and smooth, abnormal temperature control are necessary to determine whether a furnace temperature sensor has been genuinely repaired.
1. Standard Thermocouple Comparison Method (Core Verification): Attach a metrology-certified standard platinum-rhodium thermocouple in parallel with the repaired sensor and place it in the furnace's medium-temperature zone; raise the temperature to 580°C and hold it there for at least 30 minutes, recording the readings of both thermocouples; if the deviation is less than ±5°C and there are no jumps, the repair is successful.
Accuracy Guaranty: The conventional thermocouple can detect misalignment signals with an accuracy of ±1°C.
2. Measuring Temperature at Multiple Points Set up at least three separate temperature measurement locations in the furnace's upper, middle, lower, and corner sections to verify temperature uniformity; Run the entire tempering process and note the temperature at each stage. The sensor is operating normally if the greatest temperature differential is less than 5°C and the control system reading corresponds with the measured value. Case Study: Following repair testing, a factory noted that the deviance dropped from 12°C to 1°C and the bottom layer temperature increased from 568°C to 579°C, indicating effective repair.
3. Ongoing Furnace Run Test (Long-Term Validation) For at least three furnaces in a row, repeat the same procedure and note:
whether the temperature curve in the furnace is burr-free and smooth;
whether the holding phase's temperature variation is ≤±5°C;
If the same batch of workpieces has a hardness differential of less than two HRC;
Stable data suggests that the repair is long-lasting and successful.
"Comparative verification, multi-point confirmation, and continuous stability" are essential safety principles.
