Emerson Daniel 3415

GC-reported gas composition data points (continued)Table 5-9:
GC reported composition data points
PropaneGC
IsoButaneGC
NButaneGC
IsoPentaneGC
NPentaneGC
NHexaneGC
NHeptaneGC
NOctaneGC
NNonaneGC
NDecaneGC
H2SGC
HeliumGC
WaterGC
OxygenGC
ArgonGC
C6PlusGC (C6PlusGCComponentID)
NeoPentaneGC
The validity of the GC-read gas property data is readable via the
AreGasPropertiesInvalidGC data point where TRUE(1) indicates invalid data and FALSE(0)
indicates valid data. Refer to for further information on how the data validity is
determined.
In-Use gas property data
The "In-Use" gas property data is the actual data used by the meter for calculations.
The GasPropertiesSrcSel data point is used to select the gas property data source as either
Fixed (0) or Live - GC (1). If the data source is Live - GC and the GC-read data is invalid, then
the GasPropertiesSrcSelGCAlarm data point is used to select the data source as either Last
good value (0) or Fixed value (1). When Last good value is selected, the "In-Use" gas
property data is not updated with the invalid GC-read gas property data. When Fixed value
is used, the "In-Use" gas property data is updated with the fixed gas property data.
The meter maps the appropriate input gas property data points (fixed or GC-reported as
discussed above) to the corresponding "In-Use" data points (the HeatingValueInUse data
point and the gas composition data points listed in the Table 5-10 below).
In-Use gas composition data pointsTable 5-10:
"In-Use" gas composition data points
N2InUse
Configurations
Operations manual 69