Pressure transmitters are used extensively in industrial process control systems for sensing physical variables of the process fluid (flow, pressure, flow rate) by the virtue of more than one differential measurement. A pressure transmitter comprises of a pressure sensor that is coupled with a process fluid. In response, pressure sensors also offer an output to the pressure applied by the fluid process.
Two types of pressure transmitters
Pressure transmitters are available in two different types. Pressure sensors measure the pressure of a fluid process using an isolation system. The isolating system can include an isolation fill fluid that extends between the pressure sensor and isolation diaphragm and an isolation diaphragm that remains in physical contact with the fluid.
Usually the isolation diaphragm separates the pressure sensor from corrosive fluid process that is being sensed. Often, pressure is transferred from the isolation diaphragm onto the sensor through an incompressible separate fluid carried in a passageway.
On the other hand, the second type of transmitter measures absolute pressure of the fluid process. It uses a single coupling to measure the fluid process. A differential pressure transmitter is comprised of a main body that includes a measurement chamber and accommodates a pressure transducer. It also measures a relatively small pressure difference over a fairly wide absolute pressure range.
If you want to translate the low-level pressure outputs into higher level signals, then pressure transmitters are the perfect devices.
