Determine the Temperature of 3 Wire RTD

Determine the temperature of the RTD, given a measured voltage of 89.2 millivolts between test points C and D, and 88.7 millivolts between test points E and D:

Calculate Temperature of Three Wire RTD

Assume a 100 Ω RTD with α = 0.00385, and all wire resistances to be equal to each other.

Answer :

VRTD = 88.2 mV                     { Vwire = 0.5 mV (each current-carrying conductor) }

RRTD = 215.12 Ω

T = 309 degrees Celsius (from table)

T = 299.02 degrees Celsius (from formula)

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