Rtd Standard Wiring Diagram. The 3 wire rtd uses 1 additional wire and the 4 wire rtd uses 2 additional wires to compensate for the wire resistance. In this uncompensated circuit lead resistance l1 and l2 add directly to rt.
Pt100 rtd sensor pinout features uses guide datasheet. 2 wire 3 wire and 4 wire units all of which are wired in a bridge configured circuit. Eo is the output voltage.
As shown in the three lead diagram one side.
There are two tolerance standards that define a grade or class for platinum rtd accuracy. It has a resistor element connected to a wheatstone bridge. This configuration is illustrated in figureê3. An rtd is a metallic element whose resistance varies with temperature.