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what is difference between two wire &three wire pt 100 ?
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Answer Posted / 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
Measure First
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