These assemblies are available as standard with primary and optional secondary ceramic protective sheaths in a range of diameters of; impervious aluminous porcelain, impervious recrystallized alumina, impervious mullite.These ceramic sheathed thermocouple sensors are used for temperature measurement up to 1600°C plus in kilns, furnaces and flues etc.The product is available in the range of Flameproof Protection Head, Flameproof Stainless Steel Protection Head, Stainless Steel Head and various configurations .

TheseThermocouples specifically designed for hazardous environments. The high temperature thermocouples that can withstand the extreme temperatures in these environments are usually Type R, S, B, C or D thermocouples. Sheath materials that are produced for these high temperature applications are Molybdenum with an internal design that accurately locates and verifies the measurement junction.Molybdenum offers excellent mechanical properties at elevated temperatures and is exceptional for use in reducing or neutral atmospheres. Molybdenum offers superb thermal shock resistance and has potentially unlimited life at high temperatures in a vacuum.

Tantalum is best used in reducing or neutral atmospheres and in a vacuum environment. Its performance is poor in oxidizing atmospheres, and it must be protected from gases such as oxygen and nitrogen at temperatures above 570 ̊F (300 ̊C). Tantalum is outranked by tungsten for high temperature strength. tantalum tubing can be a good choice for thermocouple protection tubes for many applications from room temperature to over 5000°F, depending upon the atmosphere. Continuous operation in air should be limited to a maximum temperature of about 750°F. In vacuum, tantalum can be safely used to 5000°F.

Noble metal thermocouples based on Pt and Rh are widely used in industry for applications requiring high accuracy and good long-term stability.Types R, S, or B Platinum Thermocouple enclosed in a high purity alumina protection tube.

Temperature sensors based on precious metals demonstrate outstanding resistance to corrosion, thus guaranteeing long service life and reliable measurement accuracy.

For measuring high temperatures of up to 1700°C, thermocouple wires made of high-purity platinum or platinum/rhodium alloys are therefore the solution.

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The mineral insulated thermocouple probes are manufactured with compacted magnesium oxide (MgO) insulation housed in a stainless steel or alloy sheath that protects the thermocouple element from the application's environment. This construction provides an incredibly durable temperature sensor that can be adapted to a wide variety of applications. Operating temperatures up to 2400°F (1315°C).Special mineral insulation protects thermocouple from moisture and thermal shock and permits operation in high temperature and high pressure environments.they are bendable and may be bent to a minimum radius of five times the sheath diameter. The extreme vibration resistance also supports the use of sheathed thermocouples.
 

For high temperature applications above 1200°C, . Again offering outstanding physical properties,  can be used be at temperatures up to 1400°C. In addition to its excellent physical properties and is is also non-wetting to most non-ferrous alloys, making it resistant to build up of dross and is therefore very low maintenance.

Type C (w-rh)Thermocouples are made from Tungsten Rhenium alloys and designed for extreme high temperatures up to 4,200 F (2315 C). The thermocouple materials must be utilized in a hydrogen, inert, or vacuum atmospheres to prevent failure from oxidation.