Measurement of high temperatures, more than 1000 C, using ceramic based thermocouples can be a well-established process. To carry out this successfully the resistance wires in the thermocouple must be insulated and guarded.
The application of Ceramic materials to shield the platinum based wire is a technique that has been used for quite some time, due to the exceptional heat resistant properties of these materials. The thermocouple sensor is the most widely used heat measurement implement and is utilized for measuring the temperature within a furnace, typically used for that 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 open to the furnace. Occasionally multiple tubes are utilized inside one another to offer the quantity of insulation and protection required.
Ceramic insulators (Tubes with 2 or maybe more core holes through them) can also be utilized to isolate the several wires that check out the bi-metallic joint with the head which is the point through which sens0rs temperature is measured.
The common materials used for your tube is really a 99.7% alumina material, impervious tube, that is attached typically to some metal thermacouple head, containing a terminal block which is often used in order to connect to some standard wire to the instrumentation. Inside a less demanding heat atmosphere a mullite tube can be utilized like a cheaper alternative, that can work sufficiently as much as 1600 ‘oc. The mullite tube is additionally an impervious tube and has 60% alumina content.