Emerson Process Management ControlWave XFC - Manual (Page 129)

CI-ControlWave XFC Appendix F / F- 27
Fr - Reynolds Number Factor
Y - Expansion Factor
Fpb - Pressure Base Factor
Ftb - Temperature Base Factor
Ftf - Flowing Temperature Facture
Fg - Specific Gravity Factor
Extension - Square Feet of the Product of Differential Pressure and Static Pressure
F.6.3.1.3 1992 AGA3 Equation Configuration
The user must configure the inputs to the equation.
Pressure Tap - The user must toggle between pressure tap settings Flange/Upstrm and
Flange/Dnstrm.
Low Flow Cut Off - When the differential pressure drops below the low flow cut off value,
the flow rate will be set to zero. Default units are inches of water (H
2
O).
Figure F-18B - (1992 AGA3) Orifice Flow Equation Setup Web Page
Orifice Diameter - Orifice diameter is entered here. Default units are inches.
Pipe Diameter - Diameter of the pipe is entered here. Default units are inches.
Orifice Temp. Coefficient - Orifice coefficient of thermal expansion is entered here
(Inches per Inch-degree F).