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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Gas properties 213
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
Section 6.5.5 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 Ta bl e 6-9 below).
Table 6-9 “In-Use” gas composition data points
“In-Use” gas composition data points
N2InUse
CO2InUse
H2InUse
COInUse
MethaneInUse
EthaneInUse
PropaneInUse
IsoButaneInUse
NButaneInUse
IsoPentaneInUse
NPentaneInUse
NHexaneInUse
NHeptaneInUse
NOctaneInUse
NNonaneInUse
NDecaneInUse
H2SInUse
HeliumInUse
WaterInUse
OxygenInUse
ArgonInUse