New Purpose-Built Laser Gas Analyzer Reduces Costs and Improves Accuracy in CEMS Applications

 While striving to meet regulatory requirements for continuous emissions monitoring, industrial plants face a host of measurement challenges. Legacy technologies used in Continuous Emissions Monitoring Systems (CEMS) generally require the ongoing high costs of frequent calibration, consumables, and complex sample preparation that needs NOx converters or ozone generators. This results not only in significant ownership costs but also in added system complexity that can impact availability and increase maintenance requirements. In addition, when the measurement of multiples gasses is required, plants must purchase multiple analyzers. With a large installed base of aging analyzers, operators are looking for a cost-effective and robust measurement solution that is also compatible with their existing plant infrastructure.

The release of the new Rosemount CT4400 Quantum Cascade Laser (QCL) and Tunable Diode Laser (TDL) Continuous Gas Analyzer gives plants the opportunity to tap into the power of Emerson’s QCL technology in a standardized solution that is purpose-built to meet the needs of environmental monitoring applications measuring standard components, such as nitric oxide (NO), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), carbon dioxide (CO2), and oxygen (O2). Optimized for cold and dry applications running at ambient pressure, the Rosemount CT4400 gas analyzer offers the benefits of QCL/TDL technology, including higher sensitivity, accuracy, improved stability, and low-drift performance in a configuration that allows fast, easy integration into existing plant infrastructure without the added cost of consumables or complex sample treatment .

Because the system can hold up to four laser modules, it can measure up to seven application-specific gas components simultaneously, providing great flexibility in CEMS applications. This simultaneous, multi-component analysis within a single analyzer reduces the need for multiple analyzers and subsequent costs.

Emerson’s QCL technology detects gas molecules in both the near- and mid-infrared wavelength range. It also employs a patented laser chirp technique that enables detection of individual gas species, free from the cross-interference effects of other gas components in the stream, making the measurement highly accurate and stable down to sub ppm concentrations. This reliable performance delivers fast, high-resolution gas sensing and ensures operators meet the increasing compliance demands for emissions monitoring and nitrogen oxide (NOx) measurement, all while significantly reducing ownership costs.

What technology do you currently use for continuous emissions monitoring?

Additional information on how the Rosemount CT4400 gas analyzer ensures reliable, continuous NOx emissions monitoring is available here.

Khadra Helminski