Section 6: Meter operation

Reference, Installation, and Operations Manual

June 2013

3-9000-743 Rev S

 

 

6.1.16Gas 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 6-15for 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 Table 6-7below. 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).

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Gas properties