Thermocouple failure is a leading cause of unplanned furnace downtime, often traced back to inadequate protection sheathing for the operating environment.
Alumina Protection Tubes
Recrystallized alumina tubes suit most general furnace atmospheres up to 1800°C, offering good chemical inertness at a reasonable cost.
Molybdenum Sheathing
For vacuum and inert-atmosphere furnaces, molybdenum sheathing offers excellent thermal conductivity for faster, more accurate temperature response — provided atmosphere control prevents oxidation.
Selection Guidance
Match sheath material to your furnace atmosphere first, then consider response time requirements. Getting this wrong is one of the most common — and most avoidable — causes of premature sensor failure.
Have a question about this?
Our engineering team can advise on material selection and specifications for your furnace.