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214 Gas properties
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
The fixed gas component data points map directly to the corresponding “In-Use” gas
component data points. The GC-reported gas component data points map directly to the
corresponding “In-Use” gas component data points except for the C
6
PlusGC and
NeoPentaneGC components. The C
6
PlusGC quantity is divided among the NHexaneInUse,
NHeptaneInUse, and NOctaneInUse data points according to the component ID
(C
6
PlusGCComponentID) as listed in Ta bl e 6-1 0 below:
For example, if the C
6
PlusGC mole percentage is 1% and its component ID is 110, then 60% of
the C
6
+ mole percentage (0.60x1%=0.60%) is added to NHexaneInUse, 30% (0.30x1%=0.30%)
is added to NHeptaneInUse, and 10% (0.10x1%=0.10%) is added to NOctaneInUse.
The GC-reported NeoPentane component (NeoPentaneGC) quantity is added to the
IsoPentane component (IsoPentaneInUse).
The validity of the “In-Use” gas property data is readable via the AreGasPropertiesInvalidInUse
data point where TRUE(1) indicates invalid data and FALSE(0) indicates valid data. The validity of
the “In-Use” gas property data is a function of the validity of the selected source data. If the
source data is selected as Fixed, then the “In-Use” gas property data is valid (since the fixed data
is assumed to be valid). If the source data is selected as Live - GC, then the “In-Use” gas property
data is valid only if the GC-read gas property data is valid.
Table 6-10 C
6
+ breakdown to standard components by component ID
C
6
+ Component ID
(C
6
PlusGCComponentID)
Percentage to
NHexaneInUse
Percentage to
NHeptaneInUse
Percentage to
NOctaneInUse
108
47.466 35.340 17.194
109
50.000 50.000 0.000
110
60.000 30.000 10.000
111
57.143 28.572 14.285