In this type of configuration three lead wires would come from the RTD. So in this three-wire configuration, two wires would carry the measuring 

Ratio-Metric 2-Wire RTD application Advantage: •Very simple RTD connection. •IDAC generates the sensor excitation and the reference voltage. •Noise and drift of the Ref voltage are correlated and therefore canceled. •Only one current source no mismatch. •Up to 7 RTDs are possible Disadvantage: Voltage drop across the line resistance.

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2 Wiring diagram for RTDs Figure 2-1: RTD Lead Wire Configuration per IEC 60751 - Single Element 3-wire 4-wire Red Red White White Red Red White Note To configure a single element, 4-wire RTD as a 3-wire system, connect only one white lead. Insulate or terminate the unused white lead in a manner that prevents shorting to the ground.

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Example of 2, 3 and 4wire RTD Wiring to a 1794TB3T and BTR instructions in your ladder diagram program. These instructions let: 3 WIRE RTD INPUT 8 CHANNEL 3 AllenBradley 1794-IR8 +_ _ _ _ _ _ _ OK. Overview of FLEX I/O and your RTD Module 1-3 Publication 17946.5.4

return wires only), and over- and under-range detection and indication. IMPORTANT The module accepts input from RTDs with up to 3 wires. If your application requires a 4-wire RTD, one of the two lead compensation wires is not used, and the RTD is treated like a 3-wire sensor. The third wire provides lead wire compensation.

thermocouple or RTD input and converts it to a 4 to 20 mA DC signal for Wiring Diagram. T/C or. DC milivolts. Two-wire. RTD or ohm. Three-wire.

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 (Extension cable used to connect RTD) L2 & L3 are extension cable leads. The wire resistances R2 and R3 are inevitably included in the measured value. Wire resistance can be cancelled by calibration, but just

Hi , normally the two wires with same color are for something named distance compensation, but basically is the same connection.

2-wire 3-wire 4-wire 2x 3-wire 2x Pt 3x Pt 5050 40 50 40 60 Color coding on cables 1x 3-wire Color coding: (to DIN 47100) white, brown, green Color coding: (to VDE 0293-0) black, blue, brown Color coding: red, red/blue, white Color coding: (to IEC 60751) red, red, white 3-wire cable gr br wt bk bl br wt d/bl rd wt rd rd