Pressure Transmitter

A pressure transmitter is a field instrument that senses process pressure and converts it into a standardised output signal, commonly 4-20 mA or a digital protocol, for transmission to a control system. It is one of the most common measurements in process industries.

A pressure transmitter uses a sensing element such as a diaphragm whose deflection is detected by capacitive, piezoresistive, or strain-gauge means, then conditions and scales the signal for transmission. Variants measure gauge, absolute, or differential pressure, the latter also used to infer flow and level. Pressure transmitters matter because pressure is a critical variable for safety and control in vessels, pipelines, and reactors, and reliable transmission lets controllers regulate and protect the process continuously.