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How Do Differential Pressure Flow Meters Work? By introducing a constriction or obstruction in the pipe that creates a pressure drop, DP flow meters can precisely measure the flow of fluid within that pipe. As the pipe flow increases, more pressure drop is generated.

The DP transmitter must be mounted vertically above the pipe taps so that all potential liquid or condensation in the line will drain back into the pipe. Second is liquids. The DP will be mounted vertically below the pipe so that the line will always stay full with liquid. The third is condensing liquids such as steam.

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.

A differential pressure sensor has two ports and senses the difference in pressure between the two. I will interpret your term “pressure transmitter" to mean absolute pressure sensor. In this there is a reference gas reservoir built into one port which is compared to the other port.

A differential pressure sensor is a special type of pressure sensor that measures the change in pressure or "DP" across two ports on a device. This is different from a static or absolute pressure sensor that would measure pressure using just one port.