Emerson Process Management ControlWave XFC - Manual (Page 131)

CI-ControlWave XFC Appendix F / F- 29
BCF - Base Correction (Zb/Zf)
F.6.3.2 Frequency Flow Equation Setup
If the user configures a meter as a linear meter, the AGA7 Calculation page appears (see
Figure F-19).
Densisty Switch - Users may select whether a density meter or Gravitometer is used as
an input to the equation.
Gravitometer Press. Switch - Users may save the default value for Pressure or Volume
entered in the Gravitometer Press. Used field.
Gavitometer Temp. Switch - Users may use the default temperature value of the value
entered in the Gravitometer Temp. Used field.
Specific Gravity - Specific Gravity of the gas being measured is displayed here.
FPV - Supercompressibility Factor is displayed here.
Figure F-19 - Frequency Flow Equation Setup Web Page
K Factor Units - Users may select whether the factor is in units of CuFt/Count or
Counts/CuFt.
K Factor - Actual Gas Volume represented per count is entered here. The relationship is
controlled by the K Factor Units switch. If the K Factor Units switch is set to CuFt/Count,
and each pulse from the meter represents 100 cubic feet, the K Factor is entered as 100. If
the K Factor Units switch is set to Counts/CuFt and each pulse from the meter represents
100 cubic feet, the K Factor is entered as 1/100 or 0.01.
Frequency Input - The frequency from the meter (Hz) is displayed here.
Frequency Input Max - If the frequency input exceeds the Frequency Input Max value,
the Frequency Input Max value is used in the flow equation.