Want to understand the electrical and physical properties of a Resistance Temperature Detector (RTD) sensor?
Check out this latest KWIK (Knowledge with integrated know-how) FAQ from Michael Jackson. Here you will see a step by step guide where Michael takes you through the design and modelling using Ltspice. Just to note the model is also compatible with SPICE .
Using this KWIK FAQ and the models you can easily simulate the sensor loading of the excitation current while understanding the specific details on how to connect the signal conditioning to the RTD. Take a look at the details around the typical excitation and signal conditioning circuits used to demonstrate the behavior. You will find the KWIK FAQ note here
Also why not download the zip file to use RTD circuit application and also RTD model for 2, 3 and 4 wire models together with the KWIK FAQ.