Differential Pressure (DP) transmitters measure the difference between two pressures. They use a reference point called the low-side pressure and compare it to the high-side pressure. ... A DP transmitter can be used as a gauge pressure transmitter if the low-side is left open to the atmosphere.

How does a differential pressure transmitter work?

Any difference of pressure across the cell causes the diaphragm to flex in the direction of least pressure. If too much pressure is applied to that side, the isolating diaphragm will merely “flatten” against the solid frame of the capsule and stop moving. ...

What is meant by differential pressure transmitter?

A differential pressure transmitter is an instrument that can consistently and accurately create a pressure drop in a pipe and then use the pressure measurement on either side to provide the rate of flow within the pipe. A differential pressure flow transmitter can be easily installed in many applications.