High Temperature Thermometers

High Temperature Thermometers

High temperature thermometers are specialized assemblies designed for processes where extreme temperatures can occur - such as steel treatment, glass furnaces, flue gas service, and brick/ceramics production - reaching up to about 2000 °C. These applications drive the use of ceramic or special-alloy protection tubes/thermowells and thermocouples made from base or noble alloys, including platinum/rhodium systems, with modular configurations and optional integrated or remote transmitters.

At these temperature levels, the limiting factors are rarely the sensor alone; they include mechanical creep, oxidation, thermal shock, and chemical attack on the protection tube. Designs often rely on staged protection (inner/outer tubes), carefully chosen insulators, and connection heads positioned to reduce heat exposure while maintaining signal integrity.

The value is reliable temperature information under conditions where failure consequences are high: refractory damage, tube rupture, product quality drift, and unsafe operating states. Correct material pairing and construction methods extend service life, reduce unplanned outages, and stabilize measurements that would otherwise wander due to contamination, grain growth, or junction degradation.

Applications include furnace zone monitoring, burner management support, kiln profiling, catalyst regeneration equipment, flue and stack temperature measurement, and high-temperature heat treatment. In many cases, the thermometer must survive vibration, rapid cycling, or particulate-laden gas streams, making mechanical robustness and protection geometry as important as the sensing technology.

Selection centers on thermocouple type, accuracy class, junction style, insulation system, protection tube material, and mounting method (threaded, compression, or flanged) to match mechanical loading and sealing needs. Attention is also placed on lead wire routing, cold-junction compensation strategy, and transmitter location to balance electronics survivability with signal conditioning quality.

Instrumentation and Controls., an exclusive authorized representative of sales and service for Endress+Hauser.