Resistance Thermometer Wiring Diagram. Although the resistance temperature curve is relatively linear accurately converting measured resistance to temperature requires curve fitting. 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.
3 wire pt100 rtd sensor wiring system. Although the resistance temperature curve is relatively linear accurately converting measured resistance to temperature requires curve fitting. Resistance at temperature t r0.
A simplified form of resistancetemperature relation for a resistance thermometer becomes.
The addition of a third wire connected to one side of the measuring element helps to compensate for the lead resistance. The callendar van dusen equation is commonly used to approximate the rtd curve. 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. The different modules of rtd are shown in below figures.