QCL and TDL Analyser New Hybrid Laser Process Gas Analyser Reduces Costs for Continuous Emissions Monitoring

Editor: Ahlam Rais

Purpose-built to replace costly legacy measurement systems, high-accuracy Rosemount CT4400 Continuous Gas Analyser requires no consumables and minimises maintenance.

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Emerson’s new Rosemount CT4400 hybrid QCL/TDL continuous gas analyser reduces costs in NOx measurement and Cems applications.
Emerson’s new Rosemount CT4400 hybrid QCL/TDL continuous gas analyser reduces costs in NOx measurement and Cems applications.
(Source: Emerson)

In the midst of increasing compliance demands for emissions monitoring and nitrogen oxide (NOx) measurement in industrial applications, companies now have the opportunity to move beyond costly consumables and complex gas sample treatment. Emerson’s new Rosemount CT4400 Continuous Gas Analyser is the world’s first purpose-built Quantum Cascade Laser (QCL) and Tunable Diode Laser (TDL) analyser designed to help plants reduce ownership costs and report emissions accurately, states the firm. The Gas Analyser is used in environmental monitoring applications measuring standard components, such as nitric oxide (NO), nitrogen dioxide (NO2), sulphur dioxide (SO2), carbon monoxide (CO), carbon dioxide (CO2), and oxygen (O2).

Optimised for cold and dry applications running at ambient pressure, the Gas Analyser offers the benefits of QCL/TDL technology, including high sensitivity, accuracy, improved stability, and low-drift performance in a configuration that allows fast, easy integration into existing plant infrastructure, mentions the company.

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 continuous emissions monitoring systems (Cems) applications. This simultaneous, multi-component analysis within a single analyser reduces the need for multiple analysers, and thus the cost, adds the company.

At the heart of the Rosemount CT4400 is Emerson’s QCL technology, which detects gas molecules in both the near- and mid-infrared wavelength range. The system 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. According to the firm, this high performance ensures operators meet increasingly demanding regulatory requirements, while real-time reporting provides critical insight into process performance.

Due to its purpose-built design, which produces enhanced performance at a lower cost, the Gas Analyser ensures reliable detection and monitoring of gases and allows operators to avoid costly regulatory fines or unexpected shutdowns.