Northern injection workshop ambient temperature sharply falls below zero centigrade in deep winter; drastic cold contraction produces concentrated internal stress inside conventional thermocouple leading to insulation crack and measuring drift, targeted anti-cold-shock structural optimization effectively improves low-temperature environmental adaptability for domestic and YUDO outdoor arranged hot runner matched sensors. Ordinary sheath, core alloy and magnesia filler own different linear shrinkage coefficient; sudden sharp cooling makes sheath contract rapidly while internal filler shrinks slowly to generate tensile stress cracking compact insulation layer, cold damp air invades along crack gap and corrodes core wire after later hot runner heating into steam. Optimized anti-freeze thermocouple adopts layered flexible buffered filling craft during production to reserve minor allowable deformation margin for low-temperature shrinkage; wire root terminal transition position increases elastic insulation buffer sleeve to absorb concentrated cold contraction stress.
Outdoor exposed outer wire selects low-temperature modified Teflon insulation maintaining flexibility under minus 30℃ without brittle cracking instead of conventional easy-fracture fiberglass wire. Before annual winter arrival, workshop replaces thermocouple installed at draughty and outdoor position with anti-cold-shock customized specification in advance to reduce centralized batch low-temperature failure risk in cold season.
