RTD WIRING DIAGRAM TEMPERATURE READING
RTD Wiring Diagram 2-lead constructions result in leadwire resistance getting added to the element resistance. Consequently, the temperature reading is artificially high. The graph below shows the temperature error, from 2 leads of various sizes and lengths, for a 100-ohm platinum RTD at 100°C.
Difference Between 2 wire RTD, 3 wire RTD, and 4 wire RTD's
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Common RTD Application Problems and their Remedies
RTD sensor in 2-wire circuit; the connection lead are subjected to a large temperature change. (1) Convert to 3-wire circuit, which will essentially eliminate the ambient temperature effects (2) Convert to a 4-wire circuit - in this case connection lead resistance effects completely eliminated.
RTD Sensors: 2,3, 4 Wire RTD Sensors,Resistance
Connecting a 3 wire RTD to a 4 wire RTD instument can cause serious errors or simply not work at all, depending on the instrument circuitry. A 2 wire RTD can be used with either a 3-4 wire instrument by jumping the appropriate terminals, although this defeats the purpose and reintroduces the uncompensated resistance of the leads.
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