High Temperature Thermometers

High Temperature Thermometers

High temperature thermometers are purpose-built assemblies for extreme thermal environments where conventional industrial RTDs and standard thermowells are not viable. These applications occur in steel treatment, glass melting, flue gas services, and brick/ceramics operations, where temperatures can reach very high levels and thermal shock, corrosion, and mechanical wear are persistent threats. Such conditions drive the need for specialized protection tubes/thermowells and high-temperature thermocouple technologies.

Endress+Hauser describes these applications as requiring thermowells made from ceramic or special alloys and thermocouples made from base or noble alloys, including platinum and rhodium, depending on the temperature regime and atmosphere. Modular design is emphasized to allow configuration to the specific duty, with optional temperature transmitters either integrated at the head or installed remotely. Supported thermocouple options span common base-metal types as well as noble-metal types for the highest temperature ranges.

The benefits of this category are driven by survivability and stability. Innovative thermowell materials with increased wear and chemical resistance extend service life, while non-porous protection materials support long-term measurement stability under severe exposure. Improved lifetime directly translates to reduced maintenance intervention at the measuring point, improved process quality via stable thermal feedback, and strengthened safety margins in high-energy systems. Modular architecture further enables optimized selection without redesigning the entire measuring point.

Common deployment includes energy production (e.g., biomass and coal systems), chemical services such as gasifiers, industrial furnaces including waste incineration, and high-temperature production in glass and steel/iron. Cement and building material processes are also typical candidates. Across these environments, high temperature thermometers support critical monitoring and control loops where thermal excursions can quickly impact yield, refractory life, and equipment integrity.

Engineering selection centers on matching the thermocouple system and protection tube to the thermal regime, mechanical loading, and chemical atmosphere, while balancing response time against protection level. Connection style and mounting must account for vibration and differential expansion, and transmitter placement decisions typically reflect ambient heat, accessibility, and desired diagnostics. Proper configuration leverages the category’s modularity to meet the duty’s constraints while minimizing lifecycle cost.

At Eastern Controls, We are proud to be the exclusive authorized sales and service representative for Endress+Hauser.