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How to Understand 3 Wire of RTD PT100?

Aug 11 , 2023

When it comes to the 3 wire of RTD PT100, you may be confused by this. In fact, it's not as complicated as you think. The resistance temperature detectors around us are nothing more than wire type thermals, armored thermals and end thermals. Wired thermal resistance is a common thermal resistance used in industrial temperature measurement. It is also a kind of temperature sensor, but we usually use the temperature detector to find the temperature products we need.

On the other hand, a thorough understanding of the basic 3 wire of RTD PT100 can help us to choose thermal resistance. There is a famous saying in the field of measurement, "Different working conditions make different sensors". Conversely, different sensors can be selected based on different measuring environments. As for the 3 wire of RTD PT100, it's basic function is to eliminate the influence of lead resistance on the sensor. According to the analysis of normal Angle 3 wire refers to the electric resistance of a connection wire, at the same time the other end of the connection of two fuses, will the 3 wire and bridge used at the same time, the back of the bridge connecting two wires, the last bridge power supply connection on a piece of wire, so as to make the lead resistance to minimize the error, this is a process to eliminate lead resistance.

As I said at the beginning, the 3 wire of RTD PT100 is not complicated. By understanding the purpose and basic functions of designing the 3 wire, we can choose the appropriate resistive resistance temperature detector in the diverse thermal resistance marke.


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