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Which material is used when radiation pyrometers don’t produce a satisfactory result?

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Which material is used when radiation pyrometers don’t produce a satisfactory result?

(a) Chromel-Alumel

(b) Iron-Constantan

(c) Copper-Constantan

(d) Rhodium-Platinum

I got this question during an online exam.

My enquiry is from Pyrometry and the Types of Pyrometers in division Tools of the Metallurgist of Engineering Material & Metallurgy

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Correct answer is (d) Rhodium-Platinum

For explanation I would say: 10% Rhodium-Platinum is a noble-metal thermocouple used for measuring very high temperatures. It can be used in a temperature range of 32-3200 F. These are used when radiation or optical pyrometers do not perform satisfactorily.

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