Differential pressure measurement is largely used in domestic and industrial applications. It is often the basis of other measurements such as flow, level, density, viscosity and even temperature. The most common being level and flow.
A good differential pressure transmitter will ensure that the DP (differential pressure) is measured accurately independent of other changing parameters, and will reliably transmit a signal to represent the DP.
It will sense the difference in pressure between two ports and produce an output signal with reference to a calibrated pressure range.