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The cold junction in a thermoelectric pyrometer is maintained at ________

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The cold junction in a thermoelectric pyrometer is maintained at ________

(a) 12 F

(b) 32 F

(c) 55 F

(d) 80 F

This question was addressed to me in a job interview.

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

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Best answer
Right answer is (b) 32 F

To elaborate: The Peltier effect of thermoelectric pyrometer involves emf at the hot and cold junctions, whereas Thomson effect deals with emfs along each wire. The cold junction must be kept at a constant temperature of 0^oC or 32 F.

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