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Natural Gas Flow Computer (AGA – 8) -DP Meter (ISO/Cone)
The 515-GN04 application measures the volume, mass and gross heat content of natural gas. The instrument uses single or stacked differential pressure meters such as orifice plates, nozzles, venturi tubes or V-Cones as well as temperature and pressure sensor inputs.
The instrument calculates the flow according to generic differential pressure equations for the ISO 5167 or V-Cone meters. The flow calculations incorporate the conditions at which the flowmeter was calibrated and accurately account for thermal expansion effect.
The AGA-8 Detail Characterization Method is used to obtain accurate values of density and compressibility factors for the flow calculations.
Calculations
The gas density and compressibility factor calculations are based on the AGA-8 equations. The calculations are valid for the region:
• -130°C < t < 400°C P < 280MPa
• -200°F < t < 760°F P < 40000psia
Formulas:
• volume flow =Mflow/ρflow
• corrected flow = Mflow/ρ ref
• Heat flow = Mflow•Hm
Where:
• Mflow = mass flow
• ρflow = density at flow conditions
• ρ ref = density at reference conditions
• Hm = mass gross heating value
Features
Tailored for differential pressure mass meters with single or stacked transmitters
AGA-8 Natural Gas Detail Characterisation Method calculations for gas compositions with up to 21 components
Gross heating values calculated to ISO 6976:1995 and GPA Standard 2172-96
ISO 5167 (2003) DP flow calculations, 2 cone types
Allows for non-linear correction
Selection of second language and user tags
RTC logging with over 1000 entries
Infra-red communications port on front panel
Pulse width and scaling of pulse output
4-20mA retransmission
Selectable protocols on serial ports including Modbus RTU and printer output
Front panel adjustment of 8-24V DC output voltage
Backlit Display
LCD Backup Typical plant diagram
Downloads
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