Mineral Insulated Thermocouple
A mineral-insulated thermocouple (MI thermocouple) in which wires are usually made of materials such as chromel and alumel or other combinations depending on the desired temperature range and application insulated within a compacted mineral powder, typically magnesium oxide (MgO).
Rare Metal Thermocouple
Generally, precious metal (platinum) thermocouples are most stable with high temperature in comparison with base metal type thermocouples.
Base Metal Thermocouple
The Base Metal Thermocouples are made from conductors containing nickel alloys and depending on thermocouple type are suited for measuring temperatures between -180 to +1300°C.