SFP-2104 signal power distribution unit is not only an improved DFP power distribution unit of DDZ-Ⅲ series products but also a SEP power distribution unit of DDZ-S series product. Its main function is to provide an isolated power supply for the field installation of two-wire transmitter by-DC converter. At the same time it converts 4 ~ 20mA DC signals which from two-wire transmitter into isolated 1 ~ 5V DC voltage signal (or 4 ~ 20mA DC current signal) to supply for indicator, recorder, analog regulator, Programmable Single / multi-loop digital regulator, industrial process control machines and distributed systems. They compose a variety of monitoring and control systems and widely use in industrial process measurement and control systems. The power distribution unit is an indispensable instrument to form non-explosion-proof automatic control system.