Click on image for a pop-up of a larger view

GENERAL NOTES
There are many arrangements of high temperature thermocouple assemblies that utilize combinations of protecting tubes, thermocouple elements, terminals and mounting options. They are categorized into SINGLE, DOUBLE and TRIPLE tube assemblies which, depending on their application and design, give various degrees of protection to the thermocouple element. High temperature thermocouples are relatively expensive units that are easily contaminated so proper protection from harmful atmospheres is required in order to get suitable service life from the assembly.
Platinum 24 ga. (.020) and 30 ga. (.010) thermocouple elements have welded junctions. Insulators are round double bore alumina or mullite. Tungsten-Rhenium thermocouple elements are 24 ga. (.020). Thermocouple protection tubes are available in alumina, mullite, inconel, molybdenum, platinum, tantalum, and titanium. All metal sheaths, except Molybdenum are available in compacted or uncompacted construction. All uncompacted metal sheath assemblies are evacuated and back filled with inert gas, to hinder contamination.

CALIBRATIONS
TIC TYPE	ELEMENT COMPOSITION
R	PLATINUM VS. PLATINUM 13% RHODIUM
S	PLATINUM VS. PLATINUM 10% RHODIUM
B	PLATINUM 30% RHODIUM VS. PLATINUM 6% RHODIUM
W-W26	TUNGSTEN VS. TUNGSTEN 26% RHENIUM
W5-W26	TUNGSTEN 5% RHENIUM VS. TUNGSTEN 26% RHENIUM
W3-W25	TUNGSTEN 3% RHENIUM VS. TUNGSTEN 25% RHENIUM