Transmitter power supplies transfer 4…20 mA signals from 2- or 3-wire transmitters in hazardous areas and supply the transmitter power. They deliver an electrical signal that is proportional to a measured value such as temperature, pressure, or flow from hazardous areas to safe areas.
HART transmitter power supplies repeat the transmitter current in addition to a digital HART signal, which is modulated onto the 4…20 mA signal. Transmitter power supplies may also be used as a repeater for 4…20 mA signals.