5 FC1: Operation for Legally Relevant Functionalities
Zb Compressibility factor at base
conditions
K K factor
Zb air Compressibility factor of air at
base conditions (acc. to ISO
rd Density Measurements and calculated values
for density and relative density
Heating values and Wobbe indices
Gas
components
Gas
components
Gas composition (as far as available)
Preprocessings Preprocessings Display for all preprocessing
operations (more details below)
Table 12: Contents of the Gas Quality's main display
Preprocessing display
A preprocessing operation defines a multi-level substitution strategy for
measured input values, e.g. for pressure and temperature. An additional limit
monitoring is optional.
Within the preprocessing display, the actual values of all levels for the
selected preprocessing are shown, including status information:
• The status A indicates that the respective level is causing a prepro-
cessing alarm. The status W signalizes a preprocessing warning.
• The status in use indicates the level that is currently used as result.
• The acronyms with three letters (OOU, OOS, INT, OOO, OOC,
OLL, and OUL) denote the actual reason why a level cannot be
used.
Error status Meaning
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