Flow factor and its derivation
Mar 22, 2018

A ‘flow factor’ is to multiply the flow transmitter signal measured on a 0-10 square root or 0-100 linear scale to get the flow calculated by flow metering. This is used due to the standardization of the transmitters signals, to 20-100 kPa or 4-20mA. 
The following points are considered for flow calculation and in deriving the flow factor:

D = pipe diameter,
Small d = orifice diameter 
Service = gas or liquid
PI = operating pressure
DP = Transmitter differential pressure 
T =operating temperature 
Small p= density or molecular weight
Small v= viscosity

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