Mineral insulated thermocouple cables

The construction of a mineral insulated cable consists of two conductors (sometimes even four or six) of dissimilar alloys. These conductors are joined on the side on which temperature should be measured (hot junction). Properly joined, a voltage is produced that can be read to determine temperature (Seebeck effect). The conductors are insulated with high quality magnesium oxide and covered with a corrosion resistant sheath material, such as Inconel or Stainless steel.