ELTRA CS-2000, Руководство пользователя

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Maintenance
50
The lower end of each glass tube is filled with glass wool, for the chemicals to be retained in the
reagent tubes. Do not stuff the glass wool to tight otherwise the gas flow will be blocked. The
rest of the tube is filled with reagents as shown in the schematic below. The lower half of the
reagent tube for the oxygen pre-cleaning tube is filled with magnesium perchlorate (Anhydrone)
and the upper half with sodium hydroxide. The chemicals are separated by a glass wool layer.
Provide sufficient space at both ends of the tube so they can be attached to the glass fittings
without blocking the fitting holes. Free inner surfaces at the ends of the tubes serve as sealing
surfaces and must be cleaned after filling.
NOTICE
Use quartz wool for the catalyst furnace.
The O-rings also have to be clean. Both the O-rings and the sealing surfaces of the tubes
should be greased with silicon grease. This simplifies the fitting and particularly the removal of
the tube, and ensures proper sealing.
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.
NOTICE
When replacing the O-rings never grease the new O-rings before installation. Otherwise, the O-
rings will turn with the glass tube when trying to remove it.