I am using a US381-0000005-100PA pressure transducer. The datasheet.
The '8' indicates its the 5-20 mA current loop type. The transducer has four wires - red, white, green, and black, but the diagram on page 5 only shows the current loop type to have two wires - red and black.
Why is this, does it not matter with which polarity I connect the white and green (which I infer is where the current loop happens)?