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Natural Gas Flow Computer ES749

Utility Metering Flow Computer with AGA NX-19 for Natural Gas Applications

The Natural Gas Flow Computer ES-749 satisfies the instrument requirements for natural gas applications. The NX-19 option is available for Natural Gas calculations where the user requires compensation for compressibility effects. Compensation for these compressibility effects are required at medium to high pressure and are a function of the gas specific gravity, % CO2, % Nitrogen, as well as temperature and pressure. The compressibility algorithm used is that for AGA NX-19.

The alphanumeric display offers measured parameters in easy to understand format. Manual access to measurements and display scrolling is also supported.

Natural Gas Measurement Illustration


Other Applications for ES-749 Include:

    • Steam Mass
    • Steam Heat, Industrial Gases
    • Fuel Oil
    • Compressed Air
    • Chilled Water Only
    • Heated Water Only including Low Delta T Cutout


  • “EZ Setup”- Guided Setup for First Time Users
  • Liquid, Gas, Steam and Heat Flow Equations
  • Utility Metering – Steam, Heating/Cooling, Chilled Water, Natural Gas, Compressed Air
  • Menu Selectable Hardware & Software Features
  • Two Line LCD, OLED or VFD Display
  • Internal Data Logging Option
  • Isolated Pulse and Analog Outputs Standard
  • RS-232 Port Standard, Provides Power for Modem
  • RS-485 Optional
  • Windows™ Setup Software
  • NX19 Gas Equations, Stacked DP Transmitters
  • DDE Server & HMI Software Available
  • Remote Metering by Wireless or Modem


Training Aids



Large NEMA 4X Housing
with Hinged Cover

NEMA 4X/IP65 Enclosure
For ‘trol & SUPERtrol Cases

Large NEMA 4X/IP65 Enclosure
Accommodates Several Products

NEMA 4X/IP65 Enclosure
with Instrument Panel Option

Panel Mount Impact Printer

Panel Mount Thermal Printer

P20 Thermal Printer

P220 Impact Printer

Industrial Modbus Ethernet
to Serial Gateway

Multi-protocol Gateway

Network Gateway

Modbus RTU to
BACnet/IP Converter

IEPS-3000 Intelligent
Ethernet Multi Port Server

IEPS-1000 Intelligent
Ethernet Single Port Server

USB to RS-232
DB9 Serial Interface Adapter

CA285RS-422/RS-485 to
RS-232 Interface Converter
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