Basics of RTD Wiring

Resistive temperature devices, like thermistors and RTDs, are commonly used as sensors to measure temperature. Over the years, vast improvements have been made to thermistors and RTDs, giving them better accuracy, easier interchangeability, as well as more consistent stability. pt1000 temperature sensorThe two devices are similar in their functions, but they are made from different materials. Because of minor differences, it is important to fully understand the features of each device and their set up. For instance, RTD wiring must be done in a specific way to achieve optimal performance.

When it comes to wiring RTDs, there are four common types of circuit connections:

Two-circuit connections use a two conductor cable to link the resistance temperature detector with the evaluation electronics.

Three-wire circuits minimize the noise created by line resistance (as well as their fluctuations with temperature). For this circuit, an extra (third) wire is added to one contact on the RTD. Now, users will have two measuring channels to be used as references.

A four-wire circuit is the best choice for connecting when compared against the other the connection types. With this circuit, no line balancing is needed. Measurements do not solely rely on variations of temperature and line resistance.

Two-wire transmitters solve problems created by two-wire connections. This connection allows for sensors to convert signals into normalized signals that are proportional to temperature ( 4-20 mA).

We offer RTD Temperature Sensor, PT100 to PT 1000: Platinum Thin Film RTD Element. For more information on RTDs or Thermistors, please give us a call today!

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