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Natural Gas Flow Computer (SGERG) – DP Meter (Mass Span)
The 515-GN13 Natural Gas Flow Computer measures the volume, mass and gross heat content of natural gas. The instrument uses single or stacked differential pressure mass flow inputs and analog temperature and pressure sensor inputs.
The GN13 Natural Gas Flow Computer calculates the flow according to generic differential pressure equations and incorporates the conditions at which the flowmeter was calibrated.
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 SGERG (AGA-8 Gross) equations. The calculations are valid for the region:
• -8.0°C < t < 62.0°C P < 12MPa
• 17°F < t < 143.0°F P < 1740psia
Formulas:
• Mflow = volume flow• 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
Generic differential pressure flow calculations
Uses SGERG (AGA-8 Gross Method) Natural Gas compressibility calculations
For Natural and Coke-Oven Gases
Allows for square law and 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
Backlit Display
LCD Backup Typical plant diagram
Downloads
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