A pressure transducer is typically a millivolt or voltage system which converts input pressure into low-level electrical/electronic signals. These signals, however, are not suitable for transmission over long distances.

A pressure transmitter is a current loop instrument which incorporates an electronic amplifier and pressure sensor into one package, allowing measurement signals to be transmitted over long distances without loss of accuracy or the introduction of electrical noise. Transmitter output signals are typically 4-20 mA analog. For more information, download our article reprint "How to Select a Pressure Transducer."