An instrument engineer wants to create a temperature reference for a thermocoupl

Question

An instrument engineer wants to create a temperature reference for a thermocouple transmitter by freezing some water, knowing that the freezing point of water at sea level is 32 F (or 0 C). He inserts the thermocouple into a cup of water, then sets the cup and thermocouple inside a freezer until the water is frozen solid. He then takes the cup out of the freezer and connects the thermocouple to the temperature transmitter for calibration. Anything wrong with his/her procedure? If so, what do you suggest?

Explanation / Answer

His idea is good but there are some mistakes in his procedure. The freezing point of liquid water is 32F or 00 C but the freezing point of solid water is not 32F or 00 C it will be less than 32F. So if he take the solid cup of freezing water as reference there might be difference in the temperature measured for calibration. So instead of freezing the water to solid state he has to freeze the water to liquid state then it might be used for calibration.

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