Endress+Hauser Analytik Jena multi EA 4000, Руководство по эксплуатации

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Function and setup multi EA 4000
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3.4.2 Combustion tube and measuring gas drying
A quartz tube is used as combustion tube for Cl determination. The oxygen supply for
combustion is via a bypass in the quartz tube. The measuring gas is inducted at the
side connection of the quartz tube and routed via the drying to the Cl module. The gas
sluice filled with argon prevents the measuring gas from escaping at the entrance of
the combustion tube. The end of the combustion tube is sealed with quartz wool to
prevent dust from entering the hose system of the multi EA 4000.
Figure 15 Quartz combustion tube with gas sluice
1 Quartz wool plug
2 Bypass for oxygen supply
3 Oxygen connection adapter 4 Measuring gas outlet with boat connection
5 Argon supply at the gas sluice
Hydrogen chloride (HCl) has a high affinity with water and therefore dissolves in con-
densed water. During analysis, this behavior causes low results or memory effects. To
prevent condensation, the measuring gas must be dried as soon as it exits the combus-
tion tube. Concentrated sulfuric acid is used as desiccant. Two special sulfuric acid con-
tainers are used dependent on the method with or without measuring gas splitting.
If the sulfuric acid container with split outlet is used, an additional safety container is
installed in the gas path. This catches sulfuric acid that might be sucked out of the sul-
furic acid container.
1 Sulfuric acid container without
split outlet
2 Gas olive
Sulfuric acid container with
split outlet
4 Safety container
Figure 16 Sulfuric acid containers for measuring gas drying