Emerson Process Management ControlWave EFM 3808 - Manual (Page 232)

F-32 / Appendix F CI-ControlWave EFM
Density 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.
Gravitometer 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.
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.
Static Pressure - Actual values in use for the calculation
Temperature - Actual values in use for the calculation
Pressure Adjustment - Average Barometric Pressure (psia)
Base Pressure - Required or Contract base pressure (psia)
Base Temperature - Required or Contract base temperature (Deg. F)
Calibration Factor - Sometimes referred to as Meter Factor, this is an adjustment factor
issued by the meter manufacturer to account for known meter adjustments. The default 1,
i.e., no adjustments required.
MSCF/H - Flow rate in thousands of standard cubic feet per hour.
MSCF/H (Max) - The maximum flow value allowed through the meter at the maximum
frequency input.
F.6.4 Supercompressibility Setup
When the 1985 AGA3 calculation is selected, the Supercompressibility (Fpv) value is
calculated using the NX-19 equations. When the 1992 AGA3 calculation is used the Flowing
(Zf) and Base (Zb) compressibility factors are calculated using either the AGA8 Detail or
AGA8 Gross module. The AGA8 Gross module provides either (G, C, N) or (HV, G, C)
modes.