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210 Gas properties
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
6.1.16 Gas properties
Gas property data (composition and heating value) are used by the meter for AGA8 calculations
(for converting to base or standard volumes and for mass calculation), for energy calculation,
and for optional AGA10 calculations (sound velocity calculation and comparison). The data are
also used by JuniorSonic meters when the profile correction factor is to be calculated by the
meter (rather than fixed or a default value). See Table 6-15 for GC registers polled by the meter.
The gas property data can either be fixed (specified via data points) or optionally read from a
Daniel gas chromatograph (GC). Reading the gas property data from a GC requires both the
Option Board (Port C) and a valid GC feature key (see Section 4.1.5).
Fixed gas property data
If the data is fixed, then the heating value and its reference temperature are specified via the
MeasVolGrossHeatingVal and RefTemperatureHV data points, respectively; the gas
components are specified via the data points listed in Ta bl e 6- 7 below. Fixed gas property data is
always assumed to be valid.
if the gas composition is specified from within Daniel MeterLink, the data points’ unit is mole
percentage, not mole fraction (as the data point name would imply).