Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere ?
Correct answer: B. Platinum-platinum + rhodium
- A. Iron-constantan
- B. Platinum-platinum + rhodium
- C. Copper-constantan
- D. Chromel-alumel
Explanation
A platinum-rhodium thermocouple withstands very high temperatures and oxidizing atmospheres, making it suitable near 1600°C. Iron-constantan and copper-constantan thermocouples have much lower useful temperature limits.
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