KROHNE Summit 8800 Vol 2 - Manual (Page 98)

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SUMMIT 8800 STREAM CONFIGURATION 06
Also the tariff flow totals for all of the 4 levels of volume, mass, energy and CO2 are available for
output to e.g. the printer and the display.
6 .6 Pressure
Liquid Gas Steam
For most corrections, the pressure of the fluid is needed. The SUMMIT has elaborate selection
for multiple pressure sensors and includes error handling when one or more of these sensors
has a problem.
Zero to three pressure sensors can be connected for each stream, with the option to use the av-
erage of these values. It is also possible to use the pressure send via a serial (modbus) link, e.g.
from a SCADA system. In certain applications, there could be no pressure input for the streams,
but only an input for the station. In that case the station pressure could be used by the streams.
This section defines the selection process to arrive to an “in use” value for the pressure. There
are 6 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 chosen. If not, then the
second selection will be checked etc. The last selection is always the keypad value as defined
earlier, even if all other choices are none.
The 7 choices provided for the pressure selection are:
None No functionality or transmitter selected, the option will be skipped.
Keypad The user defined value for this range will be chosen.
Sensor 1-3 The transmitter value, as configure in hardware, will be used.
Average Average value of all transmitters (selected in DP sensor) will be used.
Serial Value as sent by Modbus e.g. from a PLC, or smart transmitter will be used.
Last good value The last good value known before loss of signal will be used.
Station A pressure as defined under the station/pressure tab
A selection could look like:
Figure 91 Stream pressure selection