Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
1-12 Introduction Revised Feb-2013
The following circumstances generate an audit record:
 Any operator change to a configuration variable
 Any change in the state of an alarm variable
 A system restart
 Certain other system events
You can view audit records on-screen in the audit log.
See the Supplement to OpenBSI 5.8 Service Pack 1 documentation for
help on interpreting audit records.
Archive Files
(Averages,
totals, and other
values)
Archive files store the value of process variables and other calculated
variables at specified intervals along with the date and time of each
entry. This includes flow rates, volumes and other calculated values.
When archive files fill up, new values overwrite the oldest entries in the
files.
The application displays archive file data in hourly, data, and periodic
logs you can view on screen.
Log Breaks
You can configure the application to support the "breaking" of a log
period when an operator-changes a parameter. When this occurs, the log
period in process closes out to make a log, and a new log begins.
Hourly Historical Data Log
Each meter run maintains an hourly data log that holds one record for
every contract hour. Hourly logs hold 840 entries or 35 days; this
ensures that the previous period of hourly data is always resident in
flash memory.
The hourly data log stores the following items:
 corrected volume
 uncorrected volume
 accumulated energy
 average static pressure
 average temperature
 average differential pressure
 average specific gravity
 average heating value
 flow time
 uncorrected count
Daily Historical Data Log
Each meter run maintains a daily data log that holds one record for
every contract gas day. You can change the contract hour the contract