Measurement of high temperatures, higher than 1000 C, using ceramic based thermocouples is really a well established process. To carry out this successfully the resistance wires throughout the thermocouple should be insulated and guarded.
The use of Ceramic materials to safeguard the platinum based wire is a method which has been used for many years, as a result of exceptional heat resistant properties of those materials. The thermocouple temperature sensor is easily the most commonly used heat measurement implement and is also useful for measuring the temperature within a furnace, typically being utilized for your melting or heat treatment of metal or indeed for manufacturing ceramic products.
The ceramic components within a typical thermocouple device will be the outer protection tube that is certainly in contact with the furnace. In some cases multiple tubes are utilized inside the other to supply the amount of insulation and protection required.
Ceramic insulators (Tubes with 2 or higher core holes through them) are also accustomed to isolate the several wires that check out the bi-metallic joint with the head which is the point from which sens0rs temperature is measured.
The standard materials used for that tube is really a 99.7% alumina material, impervious tube, which is attached typically to a metal thermacouple head, containing a terminal block which is often used to connect to some standard wire for the instrumentation. In the less demanding heat atmosphere a mullite tube can be utilized as a cheaper alternative, which can work sufficiently approximately 1600 ‘oc. The mullite tube is likewise an impervious tube and it has 60% alumina content.