The SC-II loop powered isolator is a signal conditioner whose function is to provide a retransmitted, galvanically isolated 4-20mA output signal in response to isolated 4-20 analog input. The loop powered isolator may be applied in a similar manner as a conventional two wire transmitter. The SC-II appears to the input loop as a series shunt resistor. A small sense resistor is used to measure the input current. The input loop derives it’s power from the input current loop.