How to calculate ohm of certain RTD with its temperature coefficient given?

Question

A copper RTD is used. Its resistance at 32F is 100 ohms, and its temperature coefficient is 0.245 ohm/F. What is the ohms at 200F?

Please provide an equation instead of RTD table.

Answer 1

DeltaT = 200F - 32F = 168F

deltaOhm = tempco * deltaF = 0.245 Ohm/F * 168F = 41.16Ohm

The tempco is positive so, the change in resistance will also be positive. Simply add 41.16 to the 100 Ohms to get the final resistance: 141.16 Ohms

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