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Flow-X─ Function Reference
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Flow-X General functions - fxISO6976_1983_M
fxISO6976_1983_M
ISO standard 6976 defines component properties and calculations to determine the calorific value,
density and relative density for a gas composition at the specified metering and combustion reference
temperatures and 1.01325 bar(a).
Compliance

International standard, Natural Gas - Calculation of calorific values, density, relative density
and Wobbe index (ISO 6976:1983)
Boundaries
ISO6976:1983 does not define limits for its input data.
Function inputs and outputs
Function inputs Remark EU Range Default
Name Optional tag name, tag description and
tag group
Composition Standard composition as defined in
section 'Standard gas composition. mol/mol 0..1 0
Metering reference
temperature Temperature used for calculating the
compressibility, the density and the real
relative density values
1: 0 °C
2: 15 °C - 1
Calorific value reference
temperature Temperatures used for calculating the
calorific values.
1st value represents the combustion
reference temperature and the 2nd
value the Gas volume reference
temperature
1: 25 °C / 0 °C
2: 0 °C / 0 °C
3: 15 °C / 0 °C
4: 15 °C / 15 °C
5: 60 °F / 60 °F - 1
Function outputs Remark EU Fallback
Status 0: Normal
1: Input argument out of range
2: Calculation error
3: Mole fractions do not add up to 1.0 +- 0.0001
Superior calorific value Real value at the reference conditions of
temperature and pressure MJ/m3 0
Density At the reference conditions of temperature and
pressure kg/m3 0
Compressibility - 1
Relative density - 0
Molar mass kg/kmol 0
Calculations
Calculations are performed in accordance with the standard, using the values as listed in the tables of
the standard.