D/P transmitters accept either gage or differential pressure pneumatic inputs that are converted to a proportional 4-20 mA output signal. This two wire signal loop is compatible with typical process components that accept analog input including PLCs. KING-GAGE® D/P Transmitters are also offered in hybrid versions combined with an air flow control for pneumatic sensors or downpipe (bubbler) systems. These units allow for direct 4-20 mA output from the tank with power provided by the receiver. 788 D/P Purge Control is a more basic differential pressure regulator and air flow control. It generates a constant flow of compressed air to purge a downpipe. Its integral differential pressure transmitter provides 4-20 mAdc output proportional to liquid level.