Since the lead wire used between the resistance element and the measuring instrument has a resistance itself, we must also supply a means of compensating for this inaccuracy. How the circuit is configured determines how accurately the sensor’s resistance can be calculated, and how much the temperature reading may be distorted by extraneous resistance in the circuit. Because every Pt100 element in the circuit containing the sensing element-including the lead wires, connectors and the measuring instrument itself-will introduce additional resistance into the circuit, it’s important to be able to factor out the unwanted resistances when measuring the voltage drop across the RTD’s sensing element.
RTD circuits work by sending a known amount of current through an RTD sensor and then measuring the voltage drop across that resistor at the given temperature. What is the Difference Between a 2, 3, and 4 Wire RTD?
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