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The commonly used material for the thermocouples is

  • Thermocouples are made from different combinations of metals or alloys depending on the required temperature range and accuracy.
  • Chromel-copel and Chromel-alumel are both types of thermocouples made from different combinations of nickel, chromium, and aluminum. They are commonly used for temperature measurement in the range of -200°C to 1200°C.
  • Platinum-rhodium is another type of thermocouple made from platinum and rhodium alloys. Platinum-rhodium thermocouples are commonly used for high-temperature measurement up to 1600°C or higher.
  • Therefore, the commonly used material for thermocouples includes all of the above: chromel-copel, chromel-alumel, and platinum-rhodium. The specific type of thermocouple used will depend on the required temperature range and accuracy.