4 FC1: General Information
once, twice or more times, depending on the individual requirements.
Generally, the AFB configuration is limited by the device resources.
4.3.2 FC1: Legally Relevant Software (for Use in Legal Metrology)
The Basic System with its basic functionalities is always legally relevant.
There are three types of AFBs that are legally relevant, namely the Gas
Quality AFB
, the Flow Conversion AFB, and the Table Z AFB:
The
Gas Quality AFB calculates the conversion factor C, density and
heating values by using pressure, temperature and gas quality measurement
data, taking the selected calculation standards and the base conditions to be
applied into consideration.
The
Flow Conversion AFB generates counters for volumes at base and
measurement conditions as well as mass and energy by using the gas meter
measurement data and the results of the Gas Quality AFB. It performs the
gas meter correction and the counter administration due to error handling
and – if applicable – the flow direction switching.
The Table Z AFB is intended for special applications; it calculates the
conversion factor C by using a parameterized compressibility factor table
depending on pressure and temperature.
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