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Frequency Input Natural Gas Flow Computer
The 515-GN01 application measures the volume, mass and gross heat content of a natural gas. The instrument uses a frequency volume flow input and analog temperature and pressure sensor inputs.
The instrument is compatible with a wide range of flowmeter frequency outputs. Millivolt signals, reed switches, Namur proximity switches or pulse trains can be selected via its smart front-panel programming.
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:
• Mflow = volumeflow•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
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
Allows for quadrature flow input for ISO 6551 level B pulse security
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
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