can a 3 wire rtd be used as a 2 wire rtd

A 2-wire RTD can be used with either a 3 or a 4 -wire instrument by jumping the appropriate terminals, although this defeats the purpose and reintroduces 

When an RTD is deemed the suitable choice for a particular appli- cation. either a 2-. 3- or 4-wire sensor must be selected. A break in the sensor. extension wires or leads on any RTD type 3- or 4-wire) results in poor tern- perature measurement and potentially costly diag- nostic efforts.

Let’s move on to your 3-Wire RTD 830. This RTD has a connector where the red dot means the positive side. Take your jump lead and measure it across the node. Take one of your leads and jump over to the element. Again, you should receive a reading somewhere around 109. That means your RTD is working just fine.

Insulation Thermocouple RTD Thermocouple Wire With Mini Connector Insulation K Type Thermocouple Wire With Mini Connector 1. Introduction Thermocouple extension cables are available in a variety of connector and jacket configurations to make connections between process and instrumentation easy.

You can just need to make shure that resistance messured between two wires are arround 100 ohms or more , then this two wires should be connected to RTD port , 

If necessary you can connect a 2-wire RTD to a 3-wire circuit or 4-wire circuit, as shown. As long as the junctions are near the RTD, as in a connection 

This change of resistance with temperature can be measured and used to RTD's are purchased with 2, 3 or 4 lead wires per element: 

3 Wire RTD Description. In order to minimize the effects of the lead resistances, a three-wire configuration can be used. Using this method the two leads to the sensor are on adjoining arms. There is a lead resistance in each arm of the bridge so that the resistance is cancelled out, so long as the two lead resistances are accurately the same.

RTD Sensor Connections. Proper connections for all three types of RTD sensor (2-wire, 3-wire, and 4-wire) to a user configurable transmitter are shown in the following illustrations: It is critically important to note that the common connections shown by the symbols for 3- and 4-wire RTD sensors represent junction points at the sensor ; not

Answer (1 of 3): The RTD (“Resistive Temperature Detector”) has just two terminals. The choice is whether to use a two-wire, three-wire or four-wire connection back to the measuring

Why does Pt100 have 3 wires? Pt100 Temperature Sensor Wiring Diagram The addition of a third wire, connected to one side of the measuring element, helps to compensate for the lead resistance. It is very important that each of the three wires used in the measuring circuit are equal in terms of both conductor size and length.