Pressure Transmitter
In a process plant it is often necessary to measure the pressure of liquid, gases and vapours whether in closed vessels or pipelines. This measured pressure should be then sent to PLC which is a distant control room which then uses this pressure value to control the process plant. Pressure gauges or pressure sensors may be used to measure pressure but they do not have the capability to transmit the measured pressure signal to a distance. So an instrument called a Pressure Transmitter is used for this purpose.