Answer / s.selvakumar

two wire RTD use for short distance,three wire RTD use for
long distance because of resistance compensation.

Answer / vidnyan patil

Two wire RTD used for short distance like compressor ,pump
and three wire RTD used for long distance from field to
control room.so outside atmospheric temp.present so we need
compensation resistance.Third wire used for compensation of
lead wire resistance

Answer / carl_ellis

A 2 wire RTD has no means of compensating for lead wire
resistance so the reading from a 2 wire RTD will always have
some positive error due to lead wire resistance.

A 3 wire RTD can be connected to an appropriate circuit that
compensates for the resistance of the lead wires by
accounting for the resistance of the 3rd wire, which is
presumably the same length and gauge as the other two wires
across the resistance element.

Carl Ellis
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