Hot runners undergo extreme thermal cycling every cycle, heating from ambient to operating temperature and cooling repeatedly. This expansion and contraction stress thermocouple alloys, cables, and junctions. Low-quality sensors quickly develop wire fractures or drift, leading to failure. Premium thermocouples use flexible mineral-insulated construction to withstand fatigue.
High-cycle packaging and medical molds amplify this stress. Rapid temperature changes require sensors that maintain calibration without degradation. Advanced alloys and laser-welded junctions improve resistance to thermal fatigue. Proper probe placement also reduces stress by avoiding areas of extreme expansion.
Regular inspection for drift or physical damage helps identify fatigue before failure. Choosing thermocouples rated for continuous thermal cycling ensures stability in high-volume production. Withstand thermal stress directly extends service life and improves process consistency.
