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Oxygen Monitor SGM7 10 Appendix
HB_SGM7_eng.docx
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10.4 Activated carbon filter: Description and application instructions
10.4.1 Filter construction
The figure above shows the carbon filter. Two caps close a tube containing
carbon. Both caps are welded into the tube. The Swagelok fittings have
stoppers to keep the carbon inside. The gas way is protected against carbon
particles with a pre-filter and a fine filter in the outlet of the carbon filter.
10.4.2 Application and operation of the filter
Organic components of the test gas (e.g. alcohols) are adsorbed by the
carbon. After longer usage the cell voltage or the oxygen concentration can
drop unexpectedly. This is a sign for saturation of the filter. The filter or the
carbon filling must be replaced.
10.4.3 Replacing
A saturated filter can be recycled by replacing the activated carbon filling
only. For this purpose the carbon must be poured out after removing the
Swagelok connection. Then new granulated carbon can be refilled into the
container with a small funnel. The carbon should be compressed by gently
knocking a piece of wood against the filter housing. Finally, the removed
Swagelok connection and the O-seal must be screwed onto the filter again.
Caution: Do not remove the closing stopper in the Swagelok
fittings!