7.1 General information
– Replace the magnesium perchlorate of the moisture trap of the
furnace after 150 analyses. See chapter “Front panel illustration” and
“Filling the reagent tubes”.
– The content of the oxygen pre-cleaning glass tube on the analyzer’s
front panel, see chapter ”Front panel illustration” , should be replaced
every 300 analyses. The depleting of these chemicals depends on the
purity of the carrier gas used.
NOTICE
Pay attention to the condition of the chemicals used and the cleanliness of the analyzer.
Inadequately maintained chemicals and e.g. Dirty ceramic tubes can make a significant
contribution to variations in C / S determination.
The following chemicals are used:
– Magnesium perchlorate (anhydrone) as moisture absorber
– Sodium hydroxide (ascarite) as CO2 absorber
The chemicals are replaced when they are saturated.
Please refer to the following schematics to identify the glass tubes on the analyzer. In addition
to the reagents in the glass tube, fill the bottom end of the tube with glass wool. One should pay
attention that the glass wool should be only as thick as necessary, otherwise the gas flow can
be choked. Under no conditions should the amount of glass wool be less than that shown in the
following schematics, otherwise fine particles of magnesium perchlorate can pass through the
glass wool layer blocking the hole of the fitting underneath.
It should be pointed out that magnesium perchlorate is a very strong oxidizing material.
At both ends of the glass tube, you should leave sufficient space for the gas connections to be
fitted. The free space at the tube ends serve as sealing space. They must be cleaned after
filling. The O-rings must be cleaned. Both the O-rings as well as the sealing areas of the tube
must be greased with high vacuum silicon grease. This will be easier to assemble or
disassemble and further it improves the sealing of the glass tubes.
Make sure that the O-rings are completely sealed around the glass tubes, by looking at the
imprint of the O-ring on the inner surface of the glass tube. Check whether there are fibers of
glass wool trapped between O-ring and glass tube. This causes leakages.
The O-rings are only replaced when they can no longer adequately seal, due to a damage or
age. When removing the old O-rings, be ensure that the sealing areas of the fittings are not
damaged.
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