Measurement of high temperatures, higher than 1000 C, using ceramic based thermocouples is a well known process. To carry out this successfully the resistance wires in the thermocouple need to be insulated and guarded.
The usage of Ceramic materials to guard the platinum based wire is a technique which has been used for a long time, due to exceptional heat resistant properties of the materials. The thermocoupler is considered the most commonly used heat measurement implement which is useful for measuring the temperature within a furnace, typically getting used for your melting or heat therapy for metal or indeed for manufacturing ceramic products.
The ceramic components within a typical thermocouple device will be the outer protection tube that may be subjected to the furnace. Sometimes multiple tubes are utilized inside each other to provide the level of insulation and protection required.
Ceramic insulators (Tubes with 2 or more core holes through them) are also accustomed to isolate the a couple of wires that proceed to the bi-metallic joint at the head the point through which sens0rs temperature is measured.
The normal materials used to the tube is actually a 99.7% alumina material, impervious tube, that is attached typically to your metal thermacouple head, containing a terminal block that is utilized for connecting to your standard wire towards the instrumentation. In a less demanding heat atmosphere a mullite tube can be utilized as being a cheaper alternative, that can work sufficiently as much as 1600 ‘oc. The mullite tube is additionally an impervious tube and contains 60% alumina content.