A pressure sensor is a device used for measuring the pressure of gases or liquids. It can also indirectly measure other variables such as fluid/gas flow, speed, water level, and altitude. Pressure sensors can be referred to as transducers, transmitters, senders, indicators, piezometers, and manometers, etc.

Pressure sensors and transmitters are devices that measure pressure and convert it into an electrical signal. According to the functional type, they are usually classified into the following categories, they are pressure transducer, pressure transmitter, differential pressure sensor/transmitter, melt pressure transducer, pressure switch, wireless pressure transmitter etc.