Arduino Pro Mini (3.3V) ATMEGA328P: Measure 0-5V/0-10V and 0-20mA analog inputs
For industrial environments the way to go is fully isolated, since you don't know where your signal's ground come from. Also EMC requirements are quite stricter.
For example, your 4-20 input schematic is limited in common mode from the power supply ground. That will give issue when there is a severe ground surge or something. Also I don't see any kind of filtering or EMI suppression measure.
There are application notes from major IC manufactures on 'reference designs' with all the protections needed for a given application (included the industrial ones).