Rockwell-automation 1771-IR Series D RTD Input Module User Manual Manual do Utilizador descarregar pdf (Página 65)

Appendix E

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2 and 4-Wire RTD Sensors

You can connect 2–wire and 4–wire sensors to the RTD module.

Before we show you how to do this, let’s examine the differences

between 2, 3 and 4–wire sensors.

A 2–wire sensor is composed of just that; a sensor and 2 lead wires.

Its schematic representation is shown below.

Connections for a 2–Wire Sensor









A sensor requires at least three leads to compensate for lead

resistance error, that is, an error caused by resistance mismatch

between the lead wires.

Therefore, a 2–wire sensor cannot provide compensation for error

caused by lead wire resistance. We do not recommend that you use

2–wire sensors.

About 2 and 4-Wire

Sensors

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Rockwell-automation 1771-IR Series D RTD Input Module User Manual Manual do Utilizador Página 65