About Natural Gas Chromatographs

About Gas Chromatographs

Get reliable gas composition analysis and speciation for process and natural gas applications.

Fundamentals of Gas Chromatography

Gas chromatography is one of the most widely used techniques for analyzing hydrocarbon mixtures. Some of the advantages of chromatography include a wide dynamic range of measurement (from ppm levels up to 100 percent), the detection of a wide variety of gas components, and the repeatability of measurements. Gas chromatographs are used in many applications, including product quality and process control, heating and energy measurement, as well as trace contaminant and environmental monitoring in many industries such as refining, power generation, gas processing, chemical and petrochemical.

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Fundamentals of Gas Chromatography

How it Works

Emerson’s Rosemount gas chromatographs (GCs) are equipped with the user-friendly MON software, giving operators the ability to easily configure, operate and manage the analyzer locally or remotely. It also provides analytics and greater insights into the process and the GC performance. Among the many features of the MON software is the ability to communicate across the enterprise network, securely store critical data, and generate detailed reports such as:

  • Current and archived chromatograms
  • Alarm history
  • Event logs
  • Maintenance logs

Any gas chromatograph is only as good as the quality of the sample it measures. So every sample system for Emerson’s gas chromatographs is custom engineered for the specific requirements of the application. Common features include:

  • Heated and open-panel designs
  • All components rated for the area classification
  • Automatic calibration / validation available as an option
  • Variety of sample probes to extract a reliable and stable sample from the process

The 6 or 10 port valves used in Emerson’s Rosemount gas chromatograph provide exceptional durability and low maintenance due to the unique double-sided diaphragm actuation, which eliminates the need for springs, o-rings and lubrication. Minimal movement of the internal components in the valve contributes to the rapid actuation of the valve which is ideal for applications using micro-packed and capillary columns. Other design features include:

  • Simple design for easy access and maintenance
  • Unobstructed sample flow path
  • Rotary liquid injection valves also available
  • Lifetime warranty

Whether you need to network multiple process gas chromatographs throughout the plant or simply link a single analyzer to the DCS system, Emerson’s Rosemount gas chromatographs can be configured to handle most any communication scenario, including:

  • Choice of Ethernet, FOUNDATION™ Fieldbus, Modbus Serial, or 4–20 mA analog outputs
  • Connectivity to plant control systems using industry standard protocols such as Modbus and OPC

Media & Case Studies

Meet gas quality specifications while reducing CAPEX by up to 50% and footprint by up to 40% using the industry's first explosion-proof, single-analyzer solution capable of measuring energy content, hydrogen sulfide, total sulfur and hydrocarbon dew point.

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