Items on the Meter data editor: Measured and zone analysis tabs

Host Date Time

The date/time stamp for the start of the flow period. The time zone is either host or field, based on User Options window: System Preferences tab. Whether you have selected the time zone for the host or the field dictates the time information that will be displayed in the Meter Data Editor window. For example, if it is 09:00 A.M. in the field time zone but 08:00 A.M. in the host time zone and Host has been selected as the chosen time zone, the times displayed will reflect that of the host time zone. In instances where there is a discrepancy brought on by the fact that the chosen time zone does not observe Daylight Savings Time (DST), AVEVA Measurement Advisor will account for that in the time zone conversion process.

The date/time can be colored to indicate that an Audit History or an outstanding Prior Period Adjustment (PPA) record exists. Double-click the colored date/time to access the Audit History window or the Pending PPAs window.

Edit State

The Edit State provides the current state of the information:

• An Edit State of Observed indicates that the data has been measured in the field. When data is being entered for the first time, you select the Observed checkbox.

• If the Observed checkbox is not selected, the data will be given an Edit State of User Estimated. This means that data from the field is not available. The values that appear should be considered temporary data, to be used only until the real data arrives.

• If Observed Accepted Edit State is applied to a rejected reading, the checks performed to ensure that the data is neither too old or recorded for a date in the future will not occur. Additionally, an Edit State of Observed Accepted allows observed data to be loaded into the system when the data is edited or manually overridden. At this point, a record of the changes will be stored in the Audit History, and the Observed data will be brought into the system.

• Edited indicates that there have been changes to the data. However, this edit state does not account for the values accounted for by the Manual Override state.

• Manual Override indicates that you have overridden fields that are normally calculated, such as Volume, Energy, Mass, Specific Gravity, Heating Value Ideal, Specific Gravity Ideal, and Heating Value.

• System Estimate indicates that the data did not exist in the system, so the system provided an estimate.

• Actualized indicates that you have accepted the data. In the event that new telemetered information comes in, the system will not overwrite the Actualized data.

  For more information, refer to About the edit state.

Downloaded

This column indicates when the information was downloaded from the field device.

Name

Name of the associated Gas Quality (GQ) device.

History Type

The granularity at which the history was recorded.

Backup GQ

Indicates whether a Backup GQ is currently in use for this record.

HV

This column displays the gross heating value based on a real gas volume (adjusted for compressibility). The units used to display the information can be configured in User Options.

HV Ideal

This column displays the ideal gross heating value information (not adjusted for compressibility). The units used to display the information can be configured in User Options.

SG

This column displays real specific gravity information. The pressure and temperature basis for the calculation is 14.73 PSIA and 60ºF. This value is unitless, and not subject to changes in the Unit Profile, as the units are provided by the GPS Calculation unit settings.

SG Ideal

This column displays ideal specific gravity information. This value is unitless, and not subject to changes in the Unit Profile, as the units are provided by the GPS Calculation unit settings.

N2

This column displays information about the nitrogen content. The units used to display the information can be configured in User Options.

H2

This column displays information about the hydrogen content. The units used to display the information can be configured in User Options.

S2

This column displays information about the sulfur content. The units used to display the information can be configured in User Options.

O2

This column displays information about the oxygen content. The units used to display the information can be configured in User Options.

CO

This column displays information about the carbon monoxide content. The units used to display the information can be configured in User Options.

Ar

This column displays information about the Argon content. The units used to display the information can be configured in User Options.

He

This column displays information about the Helium content. The units used to display the information can be configured in User Options.

CO2

This column displays information about the carbon dioxide content. The units used to display the information can be configured in User Options.

H2S

This column displays information about the Hydrogen Sulfide content. The units used to display the information can be configured in User Options.

H2O

This column displays information about the water content. The units used to display the information can be configured in User Options.

WVCF

This column displays information about the water vapor correction factor. The units used to display the information can be configured in User Options.

C1

This column displays information about the methane content. The units used to display the information can be configured in User Options.

C2

This column displays information about the ethane content. The units used to display the information can be configured in User Options.

C3

This column displays information about the propane content. The units used to display the information can be configured in User Options.

nC4

This column displays information about the N-Butane content. The units used to display the information can be configured in User Options.

iC4

This column displays information about the Iso-Butane content. The units used to display the information can be configured in User Options.

nC5

This column displays information about the N-Pentane content. The units used to display the information can be configured in User Options.

iC5

This column displays information about the Iso-Pentane content. The units used to display the information can be configured in User Options.

C6

This column displays information about the Hexane content. The units used to display the information can be configured in User Options.

CX+

This column displays information about components for C6 and above. The units used to display the information can be configured in User Options.

C7

This column displays information about Heptane content. The units used to display the information can be configured in User Options.

C8

This column displays information about Octane content. The units used to display the information can be configured in User Options.

C9

This column displays information about Nonane content. The units used to display the information can be configured in User Options.

C10

This column displays information about Decane content. The units used to display the information can be configured in User Options.

H20 DP

This column displays information about the water dewpoint information. The units used to display the information can be configured in User Options.

neoC5

This column displays information about the neo-pentane content. The units used to display the information can be configured in User Options.

Density

This column displays density information. The units used to display the information can be configured in User Options.

Viscosity

This column displays information about the viscosity. The units used to display the information can be configured in User Options.

BSW

This column displays information about the base sediment and water content. The units used to display the information can be configured in User Options.

Cricondentherm

This column displays information about the Cricodentherm. The units used to display the information can be configured in User Options.

Total Sulphur

This column displays information about the total sulphur. The units used to display the information can be configured in User Options.

Wobbe

The Wobbe Index quantifies the interchangeability of gasses better than heating value or specific gravity. It is defined as:

The Wobbe Index is calculated based on the BTU (60) heating value. This is defined as unitless in AVEVA Measurement Advisor and will not have unit conversion applied to it when you change the unit profile.

Z Ratio

When converting a volume from one base conditions to another, the ideal gas law is used (PV = nRT). AVEVA Measurement Advisor gives the option to configure a single alternate set of base conditions that will use the real gas law for the conversion instead (PV = ZnRT). When this is configured, the Z ratio is calculated as the compressibility factor to convert between the specified base conditions and the standard base conditions (14.73 PSI/60ºF). The Z ratio is considered unitless.