KROHNE Summit 8800 Vol 3 - Manual (Page 19)

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08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 GENERAL INFORMATION 02
2 .4 .3 ID Lookup
When pressing the ID lookup button on top of the screen, a lookup table will be generated:
Figure 2 ID lookup
As there are very many ID’s, it is possible to filter for a required ID.
2 .5 Specific Requirements for Meters and Volume Convertors
2 .5 .1 Numbering formats
The number formats used internally in the unit are generally IEEE Double Precision floating
point numbers of 64 bit resolution.
It is accepted that such numbers will yield a resolution of better than 14 significant digits.
In the case of Totalisation of Gas, Volumes, Mass and Energy such numbers are always shown to
a resolution of 8 digits before the decimal point and 4 after, i.e. 12 significant digits.
Depending upon the required significance of the lowest digit, these values can be scaled by a
further multiplier.
2 .5 .2 Alarms
Each of the various modules that comprise the total operating software, are continuously moni-
tored for correct operation. Depending upon the configuration, the flow computer will com-
plete its allotted tasks within the configured cycle time, 250mS, 500mS or 1 second. Failure to
complete the tasks within the time will force the module to complete, and where appropriate, a
substitute value issued together with an alarm indication.
For example, if a Calculation fails to complete correctly then a result of 1 or similar will be
returned, which allows the unit to continue functioning whilst an accountable alarm is raised,
indicating an internal problem.