How to Extend the Service Life of Hot Runner Thermocouples?

Extending thermocouple life reduces maintenance costs, minimizes downtime, and improves production efficiency in hot runner systems. The key factors affecting lifespan include high-temperature oxidation, mechanical vibration, cable wear, melt corrosion, and improper installation. Using high-quality MI thermocouples with Inconel or stainless steel sheaths greatly improves durability. Proper installation-including sufficient insertion depth, stress-free cable routing, and secure connectors-prevents mechanical breakage. Regular maintenance, such as cleaning terminals, checking insulation, and periodic calibration, reduces drift and failure. Avoiding overheating and rapid cooling cycles slows material aging. In corrosive resin applications, sealed and chemically resistant sensors last longer. Many manufacturers double sensor life by following correct operating and maintenance procedures. This article summarizes ten practical methods to prolong thermocouple service life, providing a complete maintenance strategy for injection molding factories.