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What is a Three-wire RTD ?

S Bharadwaj Reddy
A compromise between two-wire and four-wire RTD connections is the three-wire connection, which looks like this: In a three-wire RTD circuit, voltmeter “A” measures the voltage dropped across the RTD

Formula of 2 Wire RTD, 3 Wire RTD & 4 Wire RTD

S Bharadwaj Reddy
2- Wire RTD : where Rpt is Resistance of RTD R2 is Resistance of first lead wire (Extension cable used to connect RTD) R3 is Resistance of second lead wire

Effect of Lead Wire Resistance on RTD

S Bharadwaj Reddy
RTDs generally use copper leads bonded to the platinum element. These leads normally connect close to the element and close to each other (so that both junctions will be at

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