Pressure Transmitters and Transducers

The pressure transmitter is also known as a pressure transducer in some areas,  the main components include a pressure sensor as the sensing element for pressure measuring, a circuit part for signal process, and housing with optional materials such as stainless steel 316L, etc., according to the different working environment. The pressure transmitter and pressure transducer can directly measure pressure levels and differences in many applications. 

There are different pressure types of pressure transducer and transmitter: gauge pressure, absolute pressure and differential pressure.

Gauge Pressure: It takes the atmospheric pressure as the reference point. Since the atmospheric pressure may vary according to different locations, a gauge pressure sensor is needed to ensure accurate pressure measurement.Generally, a gauge pressure sensor has a vented tube connecting atmosphere pressure as a reference point to measure the media pressure.

Absolute Pressure: It takes the perfect vacuum as the reference point. A formula shows the difference between gauge and absolute pressure:

Absolute pressure = gauge pressure + atmospheric pressure

Differential Pressure: The pressure difference between two points or systems is known as differential pressures. Gauge is a specific differential pressure in that one pressure is always atmospheric.