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Emerson launches continuous gas analyser

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Hydrocarbon Engineering,

Emerson Automation Solutions has launched the Rosemount™ CT5800 continuous gas analyser to establish purity and optimise process control in industrial processing applications such as ethylene, natural gas and hydrogen manufacturing.

This is the first Quantum Cascade Laser (QCL) analyser designed for industrial process applications requiring Class I, Division 2 hazardous area certification built within a flameproof enclosure.

The analyser’s cell design enables high-accuracy measurement of concentrations of impurities down to low ppm levels in gas streams with linearity of response and repeatability. It incorporates up to six laser modules housed inside the same enclosure and can measure up to 12 components simultaneously, reducing the need for multiple analysers. The CT5800 also has no consumables and calibration is seldom required.

The analyser combines tunable diode laser (TDL) and quantum cascade laser technologies. The system uses a patented ‘laser chirp’ to provide near-instant high-resolution spectroscopy to detect and identify a range of molecules in both the near- and mid-infrared range of spectroscopic light with an enhanced dynamic range from sub ppm to percent levels.

Amanda Gogates, Product Manager for Rosemount Quantum Cascade Laser Analyzers, Emerson Automation Solutions, said: “In ethylene manufacturing and natural gas processing for example, establishing the purity of the gas is essential to meeting contractual requirements as well as maintaining process optimisation and safety. Operators need to perform this analysis as accurately as possible – without wasting time or money […] The CT5800 provides increased levels of measurement accuracy while allowing multiple components to be analysed simultaneously. Fast analysis time, as low as five seconds in some applications, ensures timely delivery of critical information for process monitoring and control. At the same time, the hazardous certification assures the analyser can be used in even the harshest and most threatening environments.”

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