High Temperature Thermocouple Probes

Product Details

MgO Insulated with Miniature Quick Disconnect Polarized Plug (Type E, J, K, N, T) 

Our tantalum sheathed thermocouple probes with compacted beryllium oxide (beryllia) insulation are designed for very high temperature measurements to 2,300°C. These probes are among the highest temperature capability choices for thermocouple probes. They are often used even up to the melting point of the materials — approximately 2,550°C for beryllia- for very short duration one-shot R&D measurements, simply because there are few other choices for those measurements. Of course, careful evaluation of the measurement results is in order for those cases. The tantalum sheath is tough with good ductility before use at high temperature but can become brittle after exposure to high temperature in some environments. Tantalum is subject to rapid oxidation above 285°C in an oxidizing environment but due to the very high melting point may be used to 2,482°C in a vacuum, high purity hydrogen, or high purity inert gas. 

Hot Junction Style Options 

Grounded  Style “G”
Ungrounded  Style “U”
Exposed  Style “E” 
Half-Shielded  Style “H” 

Type E, J, and T have 304 SST sheath. 
Type K and Type N have lnconel 600 sheath. 
Internal wire sizes for probe diameter of 0.010″- 0.0015; 0.020″- 0.004; 0.032″- 0.005; 0.040″-0.007; 0.063″-0.010; 0.125″-0.018; 0.188″- 0.025; 0.250″- 0.036. 

Mounting Fittings: Stainless steel compression-type mounting fittings are recommended for mounting these thermocouples. Welding’ or brazing of mounting fittings to the tantalum sheath is not recommended. Adjustable depth fittings have a lava gland (1000°C) for use to 5000 psi (200°C). Non-adjustable fittings have stainless steel ferrules for up to 10,000 psi. Pressure limits are lower if the fittings are at high temperature. Fittings in higher temperature alloys are available.