Sulfur analysis with the Coulometric Sulfur Module
multi EA 5000
78
1
2
3
4
5
6
7
Figure 49Generator and indicator electrodes, gas inlet tube
1 Generator electrodes (with union
nut)
2 Cathode (inside)
3 Diaphragm
4 Anode (outside)
5 Platinum electrodes
6 Gas inlet tube
7 Indicator electrodes
Absorber
To clean the measuring gas, two absorbers are installed in the detection module. The
absorbers remove elements from the measuring gas that could disrupt the analysis.
The NOx absorber removes nitrogen oxides (NO
x
) from the measuring gas. High nitro-
gen oxide content has an influence on the analysis and leads to false results. The filling
of the absorber is normally green. If the color changes to yellow or light brown, the fill-
ing must be replaced.
The HX absorber removes hydrogen halogens (HX with X = Cl, Br, I) from the measuring
gas. Hydrogen halogens disrupt the analysis due to cross-sensitivities. The absorber con-
tains silver wool. The silver wool must be replaced if the color changes from metallic sil-
ver to dark gray.
