High Temperature Thermometers

High Temperature Thermometers

High temperature thermometers are engineered for extreme thermal duties where conventional industrial sensors and protection materials are inadequate. In processes such as steel treatment, glass melting, flue gas measurement, and brick or ceramics production, temperatures can reach up to approximately 2000 °C, requiring specialized designs and materials to maintain survivability and measurement integrity.

These instruments typically use thermocouples selected for the required temperature range and atmosphere, including base-metal types (e.g., J, K, N) and noble-metal types (e.g., B, S, R) for the highest temperatures. Protection tubes and thermowells are manufactured from ceramic materials or special alloys to resist oxidation, corrosion, and thermal shock. Modular construction supports tailoring to the measuring point and simplifies replacement of worn components.

A modular portfolio enables configuration around the dominant failure mechanisms in high-heat service: abrasion from particulates, chemical attack, vibration, and rapid cycling. Optional temperature transmitters may be integrated close to the sensor or mounted remotely, allowing signal conditioning and standardized outputs while managing electronics exposure to heat. Threaded, compression-fitted, and flanged process connections support common furnace and ductwork mounting practices.

Primary benefits are increased uptime and safer operation by keeping critical temperature data available in harsh environments. Proper selection of thermocouple type and protection tube material improves drift performance and sensor life, while robust mechanical design helps maintain insertion depth and protects against breakage. A well-engineered assembly also improves maintainability by enabling planned change-out intervals rather than reactive replacement after failure.

Typical applications include furnaces and kilns, heat-treatment equipment, incinerators, reformers, glass and mineral processing, and high-temperature exhaust or flue gas streams. These measuring points often sit at the boundary between refractory-lined hot zones and metallic piping, making optimized protection and mounting design essential for both accuracy and service life.

Miller Mechanical Specialties, an exclusive authorized representative of sales and service for Endress+Hauser.