KROHNE Summit 8800 Vol 2 - Manual (Page 114)

114 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
6 .11 Heating Value
Liquid Gas Steam
This section defines the selection process to arrive to an “in use” value for the heating value.
There are 3 selections in order of priority with each 10 choices. The SUMMIT will start to check
the first selection. 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 later, even if all other choices are none.
Figure 113 Heating value selection
The 10 choices provided for the heating value selection are:
Keypad The fixed value entered will be used
Chromatograph A The value from GC-A will be used
Chromatograph B The value from GC-B will be used
Modbus The value from a serial modbus interface will be used
Sensor The value from the analog or Hart input will be used
Extra inputs appear for the calibration constants of this sensor.
ISO 6976 The value is calculated using the ISO 6976 standard, from the
gas data
This requires an extra input of the reference temperature of the
rd.
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
GPA2172 The value is calculated using the GPA2172 standard, from the
gas data
For gas an extra page will appear for specific data related to the
parameter.
For liquid this only applies to LNG and LPG.