Emerson Daniel 3415

- kWh/m
3
• GC heating value type - Select the type of heating value the GC will return.
- Btu-Dry
- Btu-Saturated
- Btu-Actual
• Gas composition on GC alarm - Select which gas composition the Daniel Gas
Ultrasonic meter will use if the GC goes into alarm.
- Fixed - if selected, the meter will start using the fixed gas composition stored in
the meter.
- Last Good Value - if selected, the meter will use the last gas composition
collected from the GC before the GC started to report alarms.
5.10.1 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 5-12 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 a valid GC feature key (See ). Use the Field Setup Wizard
in Daniel MeterLink
™
to configure these parameters.
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 5-8 below. Fixed gas property
data is always assumed to be valid.
NOTICE
If the gas composition is specified from within Daniel MeterLink, the data point's unit is mole
percentage, not mole fraction (as the data point name would imply).
Fixed gas composition data pointsTable 5-8:
Gas composition data points
MoleFractionN2Method2
MoleFractionCO2
MoleFractionH2
MoleFractionCO
MoleFractionMethane
Configurations
Operations manual 67