Core Accuracy Deviation Judgement: After calibration, compare the Husky thermocouple to a valid Class II standard thermocouple at typical production temperatures in the hot runner. The temperature reading error between the two must be kept within the acceptable range for the corresponding graduation number. The conventional K-type thermocouple has a pass threshold of ≤ ±1.5℃, while high-precision applications require ≤ ±1℃.
Choose three calibration points: 20%, 50%, and 80% of the total temperature range. The reading error at all points must be kept within the permitted range, with no single point exceeding the tolerance, and linear variation across the whole temperature range must be fully removed.
Performance Stability Assessment: Run at a constant temperature for two hours, recording temperature data every 15 minutes. The thermocouple output thermoelectric potential should have little unidirectional drift, a temperature fluctuation range of < ±1℃, and no leaps or lock-up occurrences.
At room temperature, the insulation resistance between the thermocouple sensing element and the protection tube is ≥100MΩ, and the loop resistance is within the usual range of 5-50Ω. There is no risk of insulation degradation or loose connections.
System Operating Condition Interlock Judgement: Once the Husky temperature controller has completed PID self-tuning, the temperature control curve is stable, with no overshoot or oscillation. It works continuously for three complete injection moulding cycles without any alerts, and the temperature measuring data remains steady.
Following calibration, a full and traceable calibration record is generated, which includes standard information, original comparison data for each temperature point, error correction values, and calibration conclusions, in accordance with the ISO 9001 quality system audit.
Meeting all of the aforementioned standards demonstrates that the Husky thermocouple calibration is qualified and fully meets the severe temperature measurement accuracy requirements of hot runner precision injection moulding.
