Emerson Rosemount CT4400 Continuous Gas Analyzer

Emerson’s Rosemount CT4400 Continuous Gas Analyzer is a purpose-built quantum cascade laser (QCL) and tunable diode laser (TDL) analyser designed to help plants report emissions correctly in 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).

Optimised for cold and dry applications running at ambient pressure, the analyser offers the benefits of QCL/TDL technology, including high sensitivity, stability and low-drift performance in a configuration that allows fast, easy integration into existing plant infrastructure. Users can just plug the product into their existing systems and be off and running; the reduced complexity of the system thus results in high analyser availability with little personnel time required.

Because the system can hold up to four laser modules, it can measure up to seven application-specific gas components simultaneously, providing flexibility in continuous emissions monitoring systems (CEMS) applications. This simultaneous, multicomponent analysis within a single analyser reduces the need for multiple analysers.

At the heart of the product is Emerson’s QCL technology, which detects gas molecules in both the near- and mid-infrared wavelength range. The system employs a 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 stable down to sub ppm concentrations. This high performance means operators meet increasingly demanding regulatory requirements, while real-time reporting provides critical insight into process performance.