FLSmidth determines the best analyser for the job and services all major analyser brands in own repair shops

  • Overview
  • Gas analysis components

The best analyser for the job

FLSmidth does not produce its own gas analyser units. We make the gas analysis solutions capable of efficient operation in the most difficult process conditions encountered – the cement and minerals industries. As an independent supplier, we select the best analyser for the job, e.g., ABB, Durag, MKS, NEO, Siemens and others. The best analyser will be defined based on various aspects depending on the specific customer, the application in question and the potential preferences of the end user.

Also, we are able to determine if the best analyser will be based on the extractive or the in situ method. As we are independent, you will not end up with the second-best analyser just because we don’t have the best model in our programme.


  • As an independent supplier, FLSmidth can determine the best analyser for the job
  • We service all major analyser brands in our repair shops
  • Our programme covers components such as O2, CO, NO, NOx, SO2, THC, TOC, H2O, HF, HCl, NH3 and Hg.
  • We are able to perform remote service and diagnostic by LiveConnect connection

The most common gas analysis components measured are:

Oxygen (O2) is typically measured by electrochemical or paramagnetic analyzers. Oxygen is the most valuable measurement in connection with process measurement in pyro processes. Oxygen will allow the operators to optimise full consumption and reduce the emission footprint of the process. Oxygen analysis will also enable a more stable operation and thereby allow full production throughput. In emission analysis, oxygen is also measured and used as a reference in connection with normalisation. Finally, oxygen is used to detect gas analysis system leakage integrity.

Carbon Monoxide (CO) analysis is used in process analysis as an early warning of imbalance in a combustion process. The CO signal is used to interlock process operation in situations where the concentration reaches a critical level. In stack emission analysis requirements, CO is normal. Finally, CO is measured as a warning against self ignition in coal processing equipment and storage silos. The concentration of CO is measured by Infrared based analyzers.

Nitro monoxide (NO) and NOx is measured in process analysis as an indicator of the pyro process temperature development. NOx is also part of the most common emission gas analysis requirements. There are many different analysers available for NO or NOx analysis. For process analysis, normally only NO is required as this will be the dominant component of the NOx found in a given process. The concentration of NO and NOx is measured by Infrared, ultraviolet or chemiluminescense based analysers.
Sulfur Dioxide (SO2) is a pyro process indicator of recirculation of volatiles in a given process. This is a very rewarding measurement in e.g. cement where it will identify any periods of increased risk of material buildup. In stack emission analysis requirements, SO2 is normal. The concentration of SO2 is measured by infrared or ultraviolet measurement depending on concentration.

NH3, HCl, HF are all emission measurements. The concentrations of the gasses are often very low, and the nature of the gas makes them difficult to analyse correctly. This demands special analyser configurations which not only takes the expected level into consideration but also local legislative demands. Often these components are measured by diode lasers or FTIR based analysers.

Total Hydro Carbons measured as THC or TOC are commonly measured in pyro processes if waste burning is involved. The measurement method is typical Flame Ionisation Detection (FID)

Dust is an emission measurement. The measurement is normally conducted in situ in processes which are not condensing. The most common technologies are scattered light or cross-duct opacity technologies. The choice of technology is based on legislation and expected dust concentration level.

Mercury (Hg) is analysed as elementary mercury. This is measured when required by emission legislation. FLSmidth is able to supply units measuring continually and online with specification of the oxidised part of the total Hg level.