High Temperature Thermometers

High Temperature Thermometers

High temperature thermometers are specialized assemblies for extreme services where conventional temperature sensors and protection concepts are insufficient. In applications such as steel treatment, glass smelters, flue gas services, and brick/ceramics processes, temperatures up to approximately 2000 °C can occur, driving the need for dedicated sensor materials and mechanical protection. These measurement points are typically based on thermocouples paired with robust protection systems.

A defining design element is the thermowell/protection tube material system. High‑temperature applications require thermowells made from ceramic or special alloys, paired with base‑metal or noble‑metal thermocouples (including types J, K, N and B, S, R) depending on temperature range, atmosphere, and stability requirements. Modular construction supports configuration to immersion length, connection style, and mounting geometry.

Protection tubes do more than provide a pressure boundary; they shield the sensing element from mechanical and chemical damage and from temperature shocks imposed by the process. This protection increases sensor life and supports more stable measurement over time, which can reduce unplanned maintenance and improve the reliability of temperature-based control and safety functions.

The portfolio emphasis includes modular selection, optional integration of a temperature transmitter (integrated or remotely mounted), and common industrial process connections such as threaded, compression‑fitted, and flanged designs. Benefits cited for these designs include long lifetime through innovative thermowell materials with improved wear/chemical resistance, long‑term stable measurement through sensor protection, and the flexibility to create customized solutions where process conditions demand it.

Typical applications include energy production (e.g., biomass or coal systems), chemical processes such as gasifiers, industrial furnaces including waste incineration, and primary industries such as glass, steel/iron production, and cement/building materials. In these services, the thermometer is often treated as an engineered assembly where materials, mechanical design, and installation geometry are selected together to achieve survivability and data quality.

Field Instruments & Controls, Inc. an exclusive authorized representative of sales and service for Endress+Hauser.