Differential Pressure Sensor

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. "DP" is also a measure of flow, and hence many applications describe their requirement as a flow measurement.

Differential Pressure measurement for low-pressure ranges is required in Medical, Industrial, and Internet-of-Things applications.

There are three basic styles of differential pressure sensor when considering media compatibility with liquids, and each one has advantages and disadvantages when compared to the other:

●       Wet/Wet

Suitable for liquids on both sides, higher cost, larger size, limited low pressure performance, higher line pressure rating

●       Wet/Dry

Suitable for liquids on the positive side only, lower cost, greater line pressure and temperature  sensitivity, limited range for negative pressure

●       Dry/Dry

Not suitable for liquids, lower cost, better low pressure performance, lower line pressure rating