Measurement of high temperatures, higher than 1000 C, using ceramic based thermocouples can be a well known process. In order to do this successfully the resistance wires inside the thermocouple have to be insulated and protected.
The application of Ceramic materials to safeguard the platinum based wire is a method that has been used for quite some time, as a result of exceptional heat resistant properties of those materials. The thermocouple controller is the most popular heat measurement implement which is employed for measuring the temperature within a furnace, typically being utilized for that melting or heat therapy for metal or indeed for manufacturing ceramic products.
The ceramic components in the typical thermocouple device are definitely the outer protection tube that is subjected to the furnace. In some instances multiple tubes are utilized inside the other to deliver the level of insulation and protection required.
Ceramic insulators (Tubes with 2 or maybe more core holes through them) will also be accustomed to isolate the a couple of wires that check out the bi-metallic joint in the head which is the point through which sens0rs temperature is measured.
The common materials used for the tube is really a 99.7% alumina material, impervious tube, which is attached typically to your metal thermacouple head, containing a terminal block that is utilized in order to connect to some standard wire to the instrumentation. Inside a less demanding heat atmosphere a mullite tube may be used like a cheaper alternative, which can work sufficiently around 1600 ‘oc. The mullite tube can also be an impervious tube and has 60% alumina content.