ELTRA CS-580A, Operating Manual

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Maintenance
25
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 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.
Remark
There are qualities of magnesium perchlorate and sodium hydroxide which have
been especially developed for combustion analyzers and other analytical
instruments. The commonly available materials fulfill their specific purposes either
inadequately or not at all.
The magnesium perchlorate which is commonly available causes memory effect
and affects repeatability. Another typical effect is that the analysis takes too long
and it is often not even completed. This effect also occurs with magnesium
perchlorate of suitable quality when it is saturated.
The commonly available sodium hydroxide binds CO2 very inadequately at room
temperature, whereas the special quality not only perfectly binds CO2 at room
temperature but also contains an indicator.
The glass tubes and the O-rings should be lubricated with high vacuum silicon
grease and not with ordinary silicone grease.
The user is free to test commonly available materials; the analyzer will not be
damaged. If problems should arise, however, suitable materials, in proper,
unsaturated condition, should be used, before calling technical service.
Remark
The bottles with chemicals must be closed very tight, immediately after use, so that
they do not become saturated with air moisture or CO2.