Highly Accurate Continuous Emissions Monitoring

Jim Cahill

Chief Blogger, Editor

Continuous emission monitoring systems (CEMS) are used by manufacturers and producers that have combustion and other forms of emissions releases as part of their processes. These systems provide the information required for regulatory reporting.

A recent news announcement, Emerson’s New Hybrid Laser Process Gas Analyzer Reduces Costs for Continuous Emissions Monitoring, describes purpose-built technology to replace legacy measurement systems. At the heart of this CEMS is a high-accuracy Rosemount CT4400 Continuous Gas Analyzer that requires no consumables and minimizes maintenance.

In this news release, Emerson’s Paul Miller explained:

Our customers are looking for a better way to measure emissions without the on-going high costs or need for frequent calibration and complex sample preparation that requires NOx converters or ozone generators… The Rosemount CT4400 Continuous Gas Analyser gives them an answer to their exact requirements in a configuration they can just plug into their existing systems and be off and running – at a lower cost than previously possible. The reduced complexity of the system over what most companies are used to, results in higher reliability and analyser availability with a lot less personnel time required.

Rosemount CT4400 Continuous Gas AnalyzerThe analyzer, based on Quantum Cascade Laser (QCL) and Tunable Diode Laser (TDL) technology, is ideal for environmental monitoring measuring standard components such as nitric oxide (NO), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), carbon dioxide (CO2), and oxygen (O2).

The QCL technology detects and measures gas molecules in both the near- and mid-infrared wavelength range. It uses a laser ‘chirp’ technique that enables the 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.

Paul notes that the range of applications beyond CEMS includes process gas analysis, air monitoring, food & beverage manufacturing & packaging, and NOx selective catalytic reduction (SCR).

Visit the About Quantum Cascade Laser Analyzers section on Emerson.com for more on this technology and application.

You can also connect and interact with other analyzer experts in the Measurement Instrumentation group’s Analytical Forum on Emerson Exchange 365.

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The opinions expressed here are the personal opinions of the authors. Content published here is not read or approved by Emerson before it is posted and does not necessarily represent the views and opinions of Emerson.