## Expert’s answer: Flow range for orifice plate

Usually when you set up a differential pressure transmitter, you need to decide what variable the device will measure, such as flow, level, volume, mass, and others. Then you can use the equations below to find your flow range for orifice plate.

Maximum flow: Max flow = K x √ΔPmax

Constant: K = max flow/√ΔPmax

Differential pressure: ΔP = (flow/K)²

Output (4-20 mA): Output mA = [(%ΔP) x 16 mA] + 4 mA

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