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FC-21 Flow Computer
7.3 Flow Equations: (Continued)
Flow Equations
Input Viscosity Computation:
Uncompensated Flow Computation:
Pulse Input; Average K-Factor
input frequency * time scale factor
Volume Flow =
K-Factor
Pulse Input; Linear Table
input frequency * time scale factor
Volume Flow =
K-Factor (Hz)
Pulse Input; UVC
input frequency * time scale factor
† Volume Flow =
K-Factor (Hz/cstk)
Analog Input; Linear
Volume Flow = input flow
Analog Input; Linear Table
Volume Flow = input flow * correction factor (input flow)
Analog Input; Orifice or External SQRT
√(calibrated density)
Volume Flow = input flow *
√(density)
Analog Input; Orifice Linear Table or External SQRT Linear Table
√(calibrated density)
† Volume Flow = CF(rn) * input flow *
√(density)
Corrected Volume Flow Computation:
Temperature Transmitter
Standard Volume Flow = volume flow * (1 - Therm.Exp.Coef. *(Tf-Tref))
2
Density Transmitter
density
Standard Volume Flow = volume flow *
reference density
Mass Flow Computation:
Mass Flow = volume flow * density
† These special flow equations are not available in the standard unit. They are to be
offered to OEMs or as special order items.
A exp
B
(Deg F + 459.67)
Absolute Density
()
† centistokes =
Where: centistokes = cP/(kg/l)