Contrec 515-GN05 Natural Gas Flow Computer

Part Number: 515–GN05 Categories: ,

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Contrec 515 Series with GN05 application is a natural gas flow computer. This application measures the volume, mass, and gross heat content of natural gas. The instrument uses single or stacked differential pressure inputs, as well as temperature and pressure sensor inputs.

This natural gas flow computer calculates the flow according to AGA-3 differential pressure equations. The flow calculations incorporate the conditions at which the flowmeter was calibrated and accurately account for the thermal expansion effect.

The AGA-8 Detail Characterization Method is used to obtain accurate values of density and compressibility factors for the flow calculations. For other gas properties, such as viscosity and isentropic exponent, the AGA-3 recommended values are used.


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

volume flow =Mflow/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

Displayed Information

The front panel display shows the current values of the input variables and the results of the calculations. A list of the variables for this application and their type (total or rate) is shown at the end of this document.
The instrument can be supplied with a real-time clock for data logging of over 1000 entries of the variables as displayed on the main menu.

Isolated Outputs

The Opto-isolated outputs can re-transmit any main menu variable. The type of output is determined by the nature of the assigned variable. Totals are output as pulses and rates are output as 4-20 mA signals. One output is standard, a second output is available as an option.

Relay Outputs

The relay alarms can be assigned to any of the main menu variables of a rate type. The alarms can be fully configured including hysteresis. Two relays are standard with additional two relays available as an option. All set-up parameters, totals, and logged data are stored in non-volatile memory with at least 30 years of retention.

Software Configuration The instrument can be further tailored to suit specific application needs including units of measurement, custom tags, second language, or access levels. A distributor can configure these requirements before delivery.
Instrument parameters including units of measurement can be programmed in the field, according to the user access levels assigned to parameters by the distributor.

Temperature and Pressure Input Types

Temperature sensor input(s) can be either PT100, PT500, 4-20 mA, 0-5 V or 1-5V signals. Pressure sensor input(s) can be either 4-20 mA, 0-5 V or 1-5V signals

  • Tailored for differential pressure 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
  • AGA-3 DP flow calculations
  • 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

Datasheet:  Contrec 515 – GN05 Datasheet
Instruction Manual: Contrec 515 – GN05 Instruction Manual

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