Pressure transmitter is used for detecting the pressure of flow and transmit the signal to remote secondary display meter or PLC system in order to achieve the pressure control or detect it in automation industry.  It is composed by pressure sensor, detecting circuit and process connection three parts. It could convert the physical pressure parameters from gas or liquid which sensor received into electronical signals, gives order to alarms. It is widely used in petroleum, chemicals, metallurgy, power, food, paper, medicine and other process control fields.