104 XFC G4 2103335 Rev AB
* NX19 GCN, NX19 GCNM, AGA-8 1992 Gross
** Enter the Heating Value in Btu per SCF. Not used in volume calculations. Only used for calculating MMBTU for reports.
5.7.6 Constants
On a single tube gas orifice meter, there are certain constants or parameters that may need to be entered or changed from the
default values. Please see Table 11 for the list of constants.
Table 11 Gas Orifice Constants
Meter Factor
(Fb Basic Orifice Factor)
Orifice Coefficient of Expansion
Pipe Coefficient of Expansion
Z of air at base condition
5.7.7 Alarm Limits
The user has the ability to set the flow computer Alarm Limits for the parameters listed in Table 12. There are many purposes for
setting these limits. i.e., controlling well output, or sending digital signals.
Table 12 Alarm Limits
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