Contrec 515-GN12 Natural Gas Flow Computer

Part Number: Contrec 515–GN12 Categories: ,

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Contrec 515 series with GN12 application measures the volume, mass, and gross heat content of natural gas by using analog volume flow, temperature, and pressure inputs.

The Flowmeter input signal can be selected as either 0-5V, 1-5V, or 4-20mA. Minimum and maximum points are programmed and non-linear correction points can be used to better reflect the flowmeter’s behaviour.

The SGERG calculation (AGA-8 Detail Characterization Method) is used to obtain accurate values of density and compressibility factors for the flow calculations.


The gas density and compressibility factor calculations are based on the AGA-8 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

Mflow = volume flow• ρflow
corrected flow = Mflow/ρ ref
Heat flow = Mflow•Hm

Mflow = mass flow
ρflow = density at flow conditions
ρ ref = density at reference conditions
Hm = mass gross heating value

  • Tailored for volumetric analog flow input such as vortex flowmeters
  • Allows for stacked flow inputs
  • Uses SGERG (AGA-8 Gross Method) Natural Gas compressibility calculations
  • For Natural and Coke-Oven Gases
  • 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
  • Backlit Display
  • LCD Backup

Datasheet:  Contrec 515 – GN12 Datasheet
Instruction Manual: Contrec 515 – GN12 Instruction Manual

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