If you've got a 4-20mA transducer, powered by 14V, and you want to measure it, your analog front end might look something like this:
... but now my thinking shifts toward failure mode considerations. My ADC has an absolute maximum rating that dictates that it's inputs must not be greater than 3.6V and must not be less than -0.3V.
What circuit do you usually put on the positive input to your ADC to make sure that it never sees more than 3.3V if the transducer fails to limit current to 20mA or if R1 doubles in resistance for some reason (or whatever). Is this input protection circuit a good idea (BAT42 Schottky diodes in a crowbar configuration) and a current limiting resistor: