KROHNE Summit 8800 Vol 2 - Manual (Page 118)

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SUMMIT 8800 STREAM CONFIGURATION 06
6 .13 Gas Data
Liquid Gas Steam
For liquids, gas data will only be needed if LNG or LPG is used, so if the line density is calcu-
lated.
This section defines the selection process to arrive to “in use” gas components. There are 4 se-
lections in order of priority with each 9 choices. The SUMMIT will start to check the first selec-
tion. If the value is valid (not in alarm) then this selection will be choosen. If not, then the second
selection will bechecked etc. The last selection is always the keypad value as defined earlier,
even if all other choices are none.
The SUMMIT goes through the selection on a per component base. So if a GC would be the first
choice and the GC only provides the data to C6+, then the other components will be taken from
the next choices. This means that also the moisture can be added as a selection though a GC
will not provide this.
The 9 choices provided for the gas data are:
Keypad The fixed value enetered under TAB’s Normal and extended are used.
Chromatograph A The data from GC-A will be used
Chromatograph B The data from GC-B will be used
Modbus The data from a serial modbus interface will be used
Analog Input The data from the analog input(s) will be used
Last Good Value The last good value before the selection went into error will be used
Last Hour Average The value from the last hour will be used
Last Day Average The value from the last day will be used
Calculated H2O value The value for moisture will be used to calculate the total componenent
Figure 116 Gas data selection
A separate choice can be made to determine the source for the average gas composition: