Maintenance and care
multi EA 5100
128
14.2.2 Cleaning the combustion tube
ð
Remove the combustion tube from the combustion furnace (→ "Removing the com-
bustion tube"
}
Remove the screw cap and septum, if present. Remove the 2 angled FAST connectors
from the combustion tube.
}
For nitrogen and sulfur determination in vertical operation mode: Remove the quartz
wool plug from the combustion tube with a long hook.
Wear protective clothing when replacing the quartz wool (labcoat, protective gloves
and glasses) Wear a respiratory mask or work underneath an exhaust vent because
quartz wool dust irritates the respiratory tracts.
}
Clean the inside of the combustion tube with a suitable solvent and a cotton swab or
bottle brush. Rinse with distilled water if the solvent is water-soluble. Otherwise,
rinse with ethanol.
}
Dry the combustion tube (e.g., by blowing it through with an inert gas).
}
Deposits from incomplete incineration, e.g., soot or solid pyrolysis residue, can also
be removed by firing the combustion tube in a muffle furnace at 750–900 °C or with
a suitable burner flame, e.g., propane.
}
For nitrogen and sulfur determination in vertical operation mode: Insert a new
quartz wool plug in the combustion tube (→ "Inserting the quartz wool plug"
ü
The combustion tube is clean and can be reinserted.
14.2.3 Inserting the quartz wool plug
For nitrogen and sulfur determination in vertical operation mode: Insert a quartz wool
plug in the combustion tube.
Missing quartz wool leads to sooting of the analysis system. Sample with high salt con-
tent form ash and solid oxides during incineration that can build up in the quartz wool.
The quartz wool must then be replaced. The quartz wool plug is not needed for opera-
tion in horizontal mode.
CAUTION
Skin and respiratory system irritation due to quartz wool
Quartz wool tends to form dust. Irritation can occur after breathing in or skin contact
with this dust.
¡
Avoid the formation of dust when working with quartz wool.
¡
Wear protective clothing and gloves.
¡
Work under an extractor or wear a respiratory mask.
NOTICE
Risk of device damage
¡
Only use the pure quartz wool supplied by Analytik Jena AG. Contaminated quartz
wool may damage the combustion tube and clog the filter.
¡
Ensure correct positioning of the quartz wool plug. When the plug is not in correct
position the sample does not vaporize evenly.
