KROHNE Summit 8800 Vol 2 - Manual (Page 100)

100 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
Optional parameters in case there is more than one transmitter in this range:
Average deviation Deviation that one transmitter may have from the average of all transmitters
before an alarm is raised.
Deviation The manimum deviation between the transmitters before an alarm is raised.
Deviation time The time during which the (previous) deviation exists before an alrm is raised.
Hysteresis for alarms and warnings to prevent continuous switching:
Hysteresis max/min
The value which must be exceeded to switch an alarm on or off.
Hysteresis hi/lo The value which must be exceeded to switch an warning on or off.
When Hart transmitters are used, then a check on its units can be set
HART unit alarm
Determines if an alarm should be raised when a pressure HART transmitter
reports another unit than defined for the transmitter
HART unit correct Determines if the pressure Hart units should be used instead of the
configured units.
Determine what to do with the accountable alarms:
Maximum alarm
Raise an alarm when the transmitter range limits are exceeded or not.
Default: Yes.
Minimum alarm Raise an alarm when the transmitter range limits are exceeded or not.
Default: Yes.
6 .7 Temperature
Liquid Gas Steam
For most corrections, the temperature of the fluid is needed. The SUMMIT has elaborate selec-
tion for multiple temperature sensors and includes error handling when one or more of these
sensors has a problem.
Zero to three temperature sensors can be connected for each stream, with the option to use the
average of these values. It is also possible to use the temperature send via a serial (modbus)
link, e.g. from a SCADA system. In certain applications, there could be no temperature input for
the streams, but only an input for the station. In that case the station temperature could be used
by the streams.
This section defines the selection process to arrive to an “in use” value for the temperature.
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 choosen. 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 temperature selection are: