Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C ?
Correct answer: D. Thermocouples
- A. Optical pyrometer
- B. Radiation pyrometer
- C. Photoelectric pyrometer
- D. Thermocouples
Explanation
Optical, radiation, and photoelectric pyrometers are designed for non-contact measurement of red-hot objects in this high-temperature range. Ordinary thermocouples are generally unsuitable for reliable measurement up to 1600°C.
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