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Why does a RTD have 3 wires?

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Why does a RTD have 3 wires?

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The Industry Standard: 3 Wire RTD
To compensate for lead wire resistance, 3 wire RTDs have a third wire that provides a measurement of the resistance of the lead wire and subtracts this resistance from the read value. ... Because 3 wire RTDs are so effective and affordable, they have become the industry standard.Aug 30, 2016

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