3 Wire Rtd Sensor Connection

The following connection diagrams illustrate how to connect various rtd types to your daq device.

3 wire rtd sensor connection.

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. Maybe you know that in resistance and rtd resistance temperature detector measurement you can use 2 3 or 4 wires but maybe you don t really remember what the difference is between them or how these connections really work. Collection of rtd pt100 3 wire wiring diagram. In this blog post i explain how a resistance or rtd meter works and the difference between the 2 3 and 4 wire connections.

Connect the black or white lead on the negative side for the resistive. The best configuration for a specific application depends on a number of factors however the sensor configuration must match with transmitter otherwise leadwire resistance cancellation circuitry. A 2 wire rtd configuration is the most useful with high resistance sensors or in applications where a great deal of accuracy is not required. 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.

3 wire rtd connections the 3 wire rtd configuration is the most commonly used rtd circuit design and can be seen in industrial process and monitoring applications.