Flame Ionisation (FID)

The flame ionisation measuring principle (FID) is used for analysis of hydro carbons, also called TOC and UHC. The analysis of TOC with the FID measuring principle is done by leading the gas into a combustion chamber where the gas is burned off in an H₂-flame. In this way, the hydro carbon molecules are decomposed, and the concentration of c-atoms is analysed by the detector. The FID measuring principle is not able to differentiate between the different hydro carbons but measures all c-atoms as a whole.

The FID analyser can be supplied either as a "heated" or "cold" version. Non-heated FID analysers are not applicable for emission measurements and other measurements in warm and wet flue gasses. This is due to the fact that hydrocarbons are water soluble and will be washed out in the analysis system prior to the actual analysis.

Thus, it is essential that the FID analyser used for measurements in warm and wet flue gas is warmed up to a temperature above the dew point of the flue gas.

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