Raw gases are untreated flue gases that have not passed through an emissions control technology system like selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR). They are generally measured for the sakes of process control and warranty tracking. Typically only a few components are measured but fourier transform infrared spectroscopy FTIR technology allows the measurement of all components. Read about our solutions for raw gas measurements!

Ammonia Slip Emissions

Selective catalytic reduction (SCR) is the process of nitrogen oxides (NOx) reduction, or DeNOx, that occurs when a NOx source is mixed with ammonia and allowed to react at the surface of a catalyst. This process is used to reduce NOx levels to those required by local environmental legislation. The result is conversion to nitrogen gas N2 and water vapor H2O, both harmless constituents of the atmosphere.

Ammonia slip refers to emissions of unreacted ammonia passing through the SCR. This occurs when ammonia is over-injected into gas stream, temperatures are too low for ammonia to react, or catalyst has degraded. Power plants and waste-to-energy plants try to control ammonia slips with a DeNOx process control. In effect this means the supervision of the SCR catalyst and the measurement of ammonia from the smokestack.

Ammonia slips are expensive to plants not to mention the environmental problem created by the ammonia emissions. To learn more, download our free Emissions Monitoring Guide.

Process Measurements – Real-time and Accurate Process Data

Process measurements are a standard tool in following different process variables and gaining important knowledge about your process. In this method gases are measured before gas washing. With real-time and accurate process data, understanding your process in detail becomes easier and quality of process control increases.

There are often multiple measurement points where raw gas composition is sought. Measuring for example hydrochloric acid (HCl) and sulfur dioxide SO2 is important to better understand the process. These gases are measured also to estimate the risk of corrosion.

Gasmet offers gas analyzers and system solutions to make the following and controlling your process easier.

Our Solutions: Continuous Monitoring System and Portable Gas Analyzer

Gasmet manufactures portable FTIR gas analyzers and stationary FTIR emissions monitoring systems. An FTIR analyzer works by simultaneously scanning entire infrared spectrum. Our Calcmet software then calculates the concentrations of each gas in the sample based on the characteristic absorption. All the gases in the sample can be measured simultaneously because the entire infrared spectrum is scanned at once. This allows for very quick multicomponent measurements and for compensation for any cross-interference.

The Continuous Emissions Monitoring System CEMS II e can be used on process side to monitor the untreated raw gases, as well as to monitor the flue gas emissions at the stack. It offers TÜV and MCERTS certified solution (QAL1) for a wide range of demanding emission monitoring applications. The CEMS II e system utilizes Fourier Transform Infrared Spectroscopy FTIR technology.

The Gasmet DX4000 can be used when you need a portable gas analyzer solution instead of continuous gas monitoring. It is portable FTIR gas analyzer for applications where multiple gas compounds need to be accurately monitored in hot & humid sample gas. Gasmet DX4000 is the world’s smallest FTIR emissions monitoring system.

Why choose Gasmet as your FTIR partner?

Gasmet is an ideal partner for raw gas measurements. Here are the top 5 reasons why you should choose us as your FTIR partner:

  • Multicomponent capability – measure multiple gases simultaneously
  • Adding new gases is easy – no need for hardware changes
  • FTIR emission monitoring systems are available with performance approvals (TÜV, MCERTS)
  • A portable FTIR analyzer allows you to take the lab to the site
  • Simple and low-cost calibration – Gasmet’s FTIR analyzers do not need any span or re-calibrations, only zero calibration with nitrogen is needed

What you need to know about emissions monitoring

In this guide we will introduce you to Emissions Monitoring and FTIR (Fourier Transform Infrared) in emissions monitoring. We will also explain what needs to be taken into consideration in an effective set-up for emissions monitoring and present real-life example data measured with Gasmet CEMS II e and CMM. Increase your Emissions Monitoring knowledge by downloading the guide free of charge!


Case: Thetford Power Station

“We originally purchased the portable Gasmet DX4000 analysers as a an emergency back-up unit, but the core measurement components of a DX4000 are exactly the same as the Gasmet CEMS, so it made sense to run both analysers simultaneously so that we always had a ‘hot’ back-up.” says EPR Group Environmental Manager Kevin Williams

Read full case study ❯

See also

Waste Incineration
Power Plants
Cement Production
Compliance Measurements
Aluminum Production
Fertilizer and Nitric Acid Production