Properties for Gas quality (GQ) : zone analysis tab
- Last UpdatedNov 20, 2025
- 3 minute read
This tab is used to define the Gas Quality (GQ) Properties that are used to determine if a gas quality should be automatically downloaded to a meter.
For this tab to be visible, the Analysis point type must be set to Zone Analysis. These properties define the deadband tolerances used for the automatic download of the gas quality information.
For more information, refer to the AVEVA Pipeline Operations for Gas documentation, as well as the The connection between AVEVA Pipeline Operations for Gas and AVEVA Measurement Advisor section in the SCADA Interface chapter of this document.
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Section |
Item |
Description |
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Zone Analysis |
Master history granularity type |
Select to define the history granularity of the GQ data that will be downloaded. |
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Automatic Download |
Enable automatic download |
Select to enable automatic download to an associated meter Note: The associated meter must also be configured for automatic GQ download, if it is a orifice, pulse or corrector meter. |
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Allow Estimated History |
Select to enable estimated history. |
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Download deadband (%) |
Type a value to enter the overall download deadband information. When any component exceeds this percentage difference between current and previous analysis, a download will be initiated. |
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Download Real-Time only |
Select to download information from SCADA only. Note: Enabling this setting will prevent Measurement Advisor from sending gas composition changes to SCADA. This means that only data that is processed within the gas quality record in the RealTime database will potentially be downloaded to the field.. |
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BTU Deadband |
Defines the deadband tolerance associated with heating value. |
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SG Deadband |
Note: Enabling this setting will block the download of the GQ data to the SCADA system. Defines the deadband tolerance associated with specific gravity. |
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CO2 Deadband |
Defines the deadband tolerance associated with carbon dioxide. |
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N2 Deadband |
Defines the deadband tolerance associated with nitrogen. |
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H2 Deadband |
Defines the deadband tolerance associated with hydrogen. |
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S2 Deadband |
Defines the deadband tolerance associated with sulphur. |
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H2S Deadband |
Defines the deadband tolerance associated with hydrogen sulfide. |
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H2O Deadband |
Defines the deadband tolerance associated with water. |
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He Deadband |
Defines the deadband tolerance associated with helium. |
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O2 Deadband |
Defines the deadband tolerance associated with oxygen. |
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CO Deadband |
Defines the deadband tolerance associated with carbon monoxide. |
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Ar Deadband |
Defines the deadband tolerance associated with argon. |
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C1 Deadband |
Defines the deadband tolerance associated with methane. |
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C2 Deadband |
Defines the deadband tolerance associated with ethane. |
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C3 Deadband |
Defines the deadband tolerance associated with propane. |
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iC4 Deadband |
Defines the deadband tolerance associated with isotopic butane. |
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nC4 Deadband |
Defines the deadband tolerance associated with normal butane. |
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iC5 Deadband |
Defines the deadband tolerance associated with isotopic pentane. |
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nC5 Deadband |
Defines the deadband tolerance associated with normal pentane. |
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neoC5 Deadband |
Defines the deadband tolerance associated with neo pentane. |
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C6 Deadband |
Defines the deadband tolerance associated with hexane. |
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C7 Deadband |
Defines the deadband tolerance associated with heptane. |
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C8 Deadband |
Defines the deadband tolerance associated with octane. |
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C9 Deadband |
Defines the deadband tolerance associated with nonane. |
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C10 Deadband |
Defines the deadband tolerance associated with decane. |
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C6 plus Deadband |
Defines the deadband tolerance associated with hexane plus. |
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Water vapor factor Deadband |
Defines the deadband tolerance associated with the Water vapor factor. |
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Water Content Deadband |
Defines the deadband tolerance associated with the Water Content. |
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Wobbe Index Deadband |
Defines the deadband tolerance associated with the Wobbe index information. |
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Carbonyl Sulfide Deadband |
Defines the deadband tolerance associated with carbonyl sulfide. |
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Mercaptans Deadband |
Defines the deadband tolerance associated with mercaptans. |
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Un-normalized Total Deadband |
Defines the deadband tolerance associated with the un-normalized total. |
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Super Compress. Deadband |
Defines the deadband tolerance associated with supercompressibility. |
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Mole Total |
Defines the deadband tolerance associated with the mole total. |
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Extended Gas Auto Download |
Water dewpoint |
Defines the deadband tolerance associated with the water dewpoint information. |
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Cricodentherm |
Defines the deadband tolerance that is associated with the cricodentherm information. |
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Total sulphur |
Defines the deadband tolerance that is associated with the total sulphur information. |
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Extended Liquid Auto Download |
Density |
Defines the deadband tolerance that is associated with the density information. |
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BSW |
Defines the deadband tolerance that is associated with the Base, Sediment, and Water (BSW) information. |
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Viscosity |
Defines the deadband tolerance that is associated with the viscosity information. |
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Low Flow Check Auto Download |
Flow rate input path |
The RealTime database pathway to the point responsible for reporting the flow rate. |
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Low flow cut-off |
The value at which the flow rate would be considered to no longer be in a low flow state. |