8 Function description
8.1 Measuring principle
The measuring method is based on the principle of sample combustion and the analysis of the
combustion gases, using infrared absorption.
A wide variety of sample materials in various forms is possible, like powders, grains, chips, solid
pieces and also some materials in liquid form. Typical materials are coal, ashes, steel, cement,
soil samples, rubber, oil etc.
During combustion, the sulphur and carbon components present in the sample are oxidized to
form SO
2
and CO
2
. Typical combustion temperature is 1350°C.
Combustion is obtained by supplying oxygen which at the same time acts as carrier gas. An
electronic flow controller keeps the flow quantity at a constant level of 180 l/h.
Dust traps and a moisture absorber ensure that a dry, dust free gas mixture is supplied to the
infrared cells.
The graphical representation of the detectors’ signals (peaks) is shown on the PC’s screen
during and after analysis. At the end of analysis the results are displayed as well. All analyses
data for every finished analysis are saved in the PC and remain available for review, results
recalculation, calibration, etc. and they can be printed out on a printer or exported to another
software, if necessary.
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