About Process Gas Chromatographs

Extended analysis of components in a wide range of process applications where gaseous or liquid streams must be monitored.


Fundamentals of Gas Chromatography

Gas chromatography is a widely accepted technique for monitoring and analyzing hydrocarbon mixtures. Installed in the field or on-line as an individual analyzer or part of an analytical system, Emerson gas chromatographs provide superior accuracy and repeatability across a wide dynamic range of components (from percent to trace-level) for Process and Natural Gas applications.

How it Works

Emerson’s Rosemount gas chromatographs come with MON software, which gives operators the ability to easily configure, operate and manage the analyzer locally or remotely and provides greater insight into your process. Among the many features of MON, you can communicate across the enterprise network, securely store critical data, and generate detailed reports such as:

  • Current and archived chromatographs

  • Alarm history

  • Event logs

  • Maintenance logs

Any process gas chromatograph is only as good as the quality of the sample it measures. So every sample system for Emerson’s process 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 durability and low maintenance due to double-sided diaphragm actuation that eliminates need for springs, o-rings and lubrication. Minimal internal components movement in the valve contributes to rapid actuation , ideal for applications using micro-packed and capillary columns. Other design are:

  • Simple design
  • Unobstructed sample flow path
  • Rotary liquid injection valves
  • Lifetime warranty

Rosemount gas chromatographs can be configured with m detector types to handle a wide range of analytical demands found in typical process applications. Whether components are in the percent range or low ppm, precise and reliable measurement is possible. Detectors types include:

  • Thermal Conductivity Detectors (TCD), sensitive down to ultra-low ppm
  • Flame Ionization Detectors (FID), sensitive down to ppb
  • Flame Photometric Detectors (FPD), for trace sulfur compounds

Whether you want 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


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