The Type PR4000B is a Digital Power Supply and Display module, available with either one or two channels and a 4.5 place backlit LCD display. It supports internal or external set points and master/slave control schemes. The single-channel version controls one Baratron® transducer or a Mass-Flo® meter or controller. Options include leak test, linearization, and totalizer functions. The two-channel version supports up to two pressure transducers or two mass flow controllers, or one of each. It mounts into a standard 3U half-rack opening.