2-Wire RTD temperature sensors are commonly used in shorter distance measurements as compared to the 3 and 4-wire designs or where the electronic circuit is 

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.

RTD (Resistance Temperature Detectors) have 2, 3, or 4 lead configurations. The 3 wire circuit works by measuring the resistance between #1 & #2 (R 1+2) 

Pt100 RTD sensor usually has two-wire and three-wire connection methods. The two-wire connection is to connect a wire to both ends of thermistor.

4-wire construction is used primarily in the laboratory where close accuracy is required. In a 4 wire RTD the actual resistance of the lead wires can be determined and removed from the sensor measurement. The 4-wire circuit is a true 4-wire bridge, which works by using wires 1 & 4 to power the circuit and wires 2 & 3 to read.

Atlas Scientifics OEM class RTD 2-Wire circuit offer the engineers a slim downed version of the EZO RTD circuit. We cut out the fat and get right to the 

Their relationship is none of your concern. Seriously, if you don't already know the answer, stay away from electrical wiring. It could be costly, and/or deadly 

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.

8 Two-Wire RTD, High-Side Reference Measurement Circuit.. 12 9 Three-Wire RTD, Low-Side Reference Measurement Circuit.. 14 10 Three-Wire RTD, Low-Side Reference Measurement Circuit With One IDAC Current Source A Basic Guide to RTD Measurements circuit.

When accuracy is not critical, a two-wire RTD is the least expensive; offering. Using lead wires to place any distance between a two wire RTD and a receiving device will further compromise its

So for using a 2-wire RTD as a 4-wire RTD, make connections as follows. Connect a cable parallel to both the existing cables. Make connections at all terminals as shown in the figure. Here also we can do connections in 2 types of configurations. But always keep in mind that the accuracy of temperature measurement decreases if we convert 2-wire