Isolators SGS-12 series create galvanic isolation between input and output circuits. Isolator doesn’t need any power supply. 0/4-20 mA current output signal can also be processed into voltage 0/2-10V signal with standard 500Ω load resistance. Then for class 0,5% it is advised to use voltage input R ≥ 100 kΩ. Quality of isolation depends on breakdown voltage and also capacity between separated circuits.