What is the Function of a Pressure Transmitter? The pressure transmitter is considered one of the most flexible measuring instruments that is used in different industries. To better understand the use of a pressure transmitter, we look at what it is and its primary functions in particular sectors or industries. The Definition of a Transmitter Transmitters are defined as apparatus that converts the electrical signal received from a transducer that is then changed into a more powerful signal over a considerable distance. A transmitter is not to be confused with a transducer. Transmitters will convert the electrical signal received by the transducer.