KROHNE Summit 8800 Vol 2 - Manual (Page 103)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
6 .8 Line density
Liquid Gas Steam
Liquid Gas Steam
Liquid Gas Steam
For most corrections, the line density of the fluid is needed. The SUMMIT can an elaborate
selection for the density source and includes error handling when one or more of these sources
has a problem.
For liquid and gas, up to three density sensors can be connected for each stream: two Emerson/
Solartron or Sarasota pulse inputs and one (measured) analog or Hart input. For steam one
sensor via analog or Hart input can be used.
It is also possible to use the density send via a serial (modbus) link, e.g. from a SCADA system.
Furthermore a density table or a calculation can be used.
This section defines the selection process to arrive to an “in use” value for the density. There are
4 (6 for gas) selections in order of priority with each 7 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 be checked etc. The last selection is always the keypad value as
defined later, even if all other choices are none.
The 7 choices provided for the density selection are:
None No functionality or transmitter selected, the option will be skipped.
Keypad The user defined value for this range will be choosen.
Solartron & Sarasota
1/2
The transmitter value, as configure in the hardware pulse input, will be used.
Measured/ Sensor The transmitters value as defined in the Hart or mA input, will be used.
Serial or modbus A value from Modbus e.g. a meter, a PLC or smart transmitter will be used.
Table A density table with varying pressure and temperature will be used
Calculated A calculation (for LPG, LNG and gasses only). For steam this is IAPWS IF97.
Estimate (steam only) An estimation based on the pressure and temperature.
A selection could look like: