Emerson ROC827 instruction manual Meter Runs and Stations, Flow Calculations

ROC827 Instruction Manual

The historical database is maintained in 11 segments. You can configure each segment in the database to archive selected points at specified time intervals. The segments can continuously archive or can be turned on and off.

You can distribute history points among history segments 1 through 10 and the general history segment. For each history segment, you can configure the number of periodic history values archived, the frequency of archiving periodic values, the number of daily values archived, and the contract hour. The number of minute values is fixed at 60. The 200 points provide a total of over 197,000 entries (equal to more than 35 days of 24- hour data for 200 points).

The Event Log records the last 450 parameter changes, power on and off cycles, calibration information, and other system events. The event is recorded along with a date and time stamp. The Alarm Log records the last 450 configured occurrences of alarms (set and clear). You can view the logs, save them to a disk file, or print them using ROCLINK 800 software.

1.4.2 Meter Runs and Stations

You can group similarly configured meter runs into stations, which provide great benefits during configuration and reporting. You can also configure each meter run, which eliminates redundant meter run data within a station and enables faster data processing.

You can group meter runs among the maximum of twelve stations in any combination. Meter runs belong in the same station when they have the same gas composition data and calculation methods. Stations allow you to:

ƒSet contract hours differently for each station.

ƒDesignate several individual meter runs as part of a station.

ƒConfigure one to twelve meter runs for each station.

1.4.3Flow Calculations

Gas and liquid calculation methods include:

ƒAGA and API Chapter 21 compliant for AGA linear and differential meter types.

ƒAGA 3 – Orifice Plates for gas.

ƒAGA 7 – Turbine Meters (ISO 9951) for gas.

ƒAGA 8 – Compressibility for Detailed (ISO 12213-2), Gross I (ISO 12213-3), and Gross II for gas.

ƒISO 5167 – Orifice Plates for liquid.

ƒAPI 12 – Turbine Meters for liquid.

ROC827 firmware completes full calculations every second on all configured runs (up to 12) for AGA 3, AGA 7, AGA 8, ISO 5167, and ISO 9951.

Issued Mar-06 General Information 1-12