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Published byLina Marking Modified over 2 years ago

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Automation Totalflow Measurement & Control Systems AGA7 Equations Design Considerations

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v v Counts all pulses from primary device up 30 KHz v v Computes corrections for Pressure Base, Temperature Base and Compressibility v v Adjustable Calculation Period of 1, 2, 5, 10, 30, or 60 minutes. v v Compressibility (Fpv 2 ) computed using – –NX19, various method – –AGA8-92 Gross Method – –AGA8-92 Detail Method (up to 23 composition variables ) Summary - Totalflow’s AGA-7 Implementation

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v v Also on a one second basis, “flow-dependent” accumulators for Pf, and Tf in order to construct averages for us in Vol Calc Period calculations. v v Additional set of timed averages (independent of flow) are maintained to provide Pf and Tf averages for complete periods without flow v v Adjustable flowperiod window for detecting no flow conditions (Works well for both slow speed and high speed pulse trains) v v Extrapolation of live inputs during transducer calibration

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Calculation Method Calculation Method Calculation Units Calculation Units Reporting Units Reporting Units Fpv Method Fpv Method Contract Hour Contract Hour Temperature Base Temperature Base Pressure Base Pressure Base Ft and Fp for one form of NX19 Ft and Fp for one form of NX19 Barometric Pressure Barometric Pressure Faux - Auxiliary Factory Faux - Auxiliary Factory Factor Selects Factor Selects Hi/Lo Limits for Pf, ACF, TF, Rate Hi/Lo Limits for Pf, ACF, TF, Rate Use Fixed or Live Tf? Use Fixed or Live Tf? Fixed Temperature Fixed Temperature RTD Zero Offset RTD Zero Offset K Factor Use Fixed or Live Pf? Fixed Pf Pf Calibration Points (3 or 5) Fixed Composition (Events) Live Composition (No Events) Device ID (10 characters) Calculation Period Log Period Averaging Technique (Linear or Square Root) Database Size Parameters Number of Events Number of Log Period Records Number of Day Period Records AGA-7 Configuration Data Summary

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AGA-7 Log Period Data Summary Log Period is programmable (Default=60 min) Log Period is programmable (Default=60 min) Number of Log Period Records is programmable (Default = 970 records, or 40 days of hours + 10 skips) Number of Log Period Records is programmable (Default = 970 records, or 40 days of hours + 10 skips) Record Size = 36 bytes Record Size = 36 bytes Log Period Data Items Date/Time Sequence Number Raw Pulse Count Average Pf Average Tf Uncorrected Volume (ACF) Corrected Volume (MCF) Energy Flowtime Period time Discrete Alarms (24) Verification Code

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AGA-7 Day Period Data Summary Number of Day Period Records is programmable (Default = 50 Day records, 40 Days + 10 Day Skips) Number of Day Period Records is programmable (Default = 50 Day records, 40 Days + 10 Day Skips) Record Size = 100 bytes Record Size = 100 bytes Day Period Data Items Day Period Data Items Date/TimeDate/Time Sequence NumberSequence Number Event Sequence #Event Sequence # Starting Log Period Sequence #Starting Log Period Sequence # Ending Log Period Sequence #Ending Log Period Sequence # Contract HourContract Hour Day Period Data Items cont Uncorrected Volume (ACF) Corrected Volume (MCF) Energy Flow Time Backflow Time Period Time Discrete Alarms (24) Min, Max & Avg Pf %PF Hi, %PF Lo Min, Max & Total Pulse Count % ACF Hi, %ACF Lo Min, Max & Avg Tf %Tf Hi, %Tf Lo Verification Code

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AGA-7 Log Period & Day Period Discrete Alarms AGA Calculation Error AGA Calculation Error NX19 Used Methane- Gravity NX19 Used Methane- Gravity Alternate Analysis Used Alternate Analysis Used Low Lithium Battery Low Lithium Battery Low Charger Low Charger Pulse Measurement Error Pulse Measurement Error Pf Measurement Error Pf Measurement Error Tf Measurement Error Tf Measurement Error DO #1 Tripped DO #1 Tripped DI #1 Detected DI #1 Detected Backflow Detected Zeroflow Detected ACF Below Low Limit ACF Above Hi Limit Pf Below Low Limit Pf Above Hi Limit DO #2 Tripped DI #2 Detected Tf Below Low Limit Tf Above Hi Limit

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AGA-7 Event Log Number of Event Records is programmable (Default = 200 Events) Number of Event Records is programmable (Default = 200 Events) Record Size = 12 bytes Record Size = 12 bytes Event Record Data Items Date Time Event Flags (dayskip) Sequence # Event Code Old Value New Value Verification Code

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