short circuits, grounds, and corrosion, which, in turn, may damage components. The effects due
to humidity are controlled by maintaining the equipment in the proper environment.
The density of the fluid, ambient temperature, and humidity are the three factors which can affect
the accuracy and reliability of flow sensing instrumentation. The purpose of each block of a
typical differential pressure flow detection circuit is summarized below.
Flow Circuitry Summary
The differential pressure is used by the DP transmitter to provide an output
proportional to the flow.
The extractor is used to electronically calculate the square root of the differential
pressure and to provide an output proportional to system flow.
The indicator provides either a local or a remote indication of system flow.