BA 4510
9.3.2 Filter use and functionality
The activated carbon filter retains and adsorbs organic residue (e.g. alcohols) from the gas to be analysed.
After some time of use, if the cell voltage increases unexpectedly or the oxygen concentration drops considerably on the inert
gas measuring device, one can assume the filter is saturated with organic components, thus ineffective. The filter or activated
carbon must be replaced.
When consecutively using the filter in different measurement setups, ensure the direction of flow of the sample gas is the same.
Otherwise the previously collected organic compounds can desorb, falsifying measurements. The sample gas should therefore
always flow in the direction of the arrow on the filter housing.
9.3.3 Replacing the Activated Carbon
If the filter is saturated, it must be replaced. To replace the activated carbon yourself, disconnect the gas connection at the filter
INLET (spanner width 19) and empty the activated carbon. Use a small funnel to add fresh activated carbon and compact by
tamping the wall with a plastic or wooden object. Then reconnect the screw-in connection and gaskets. The filter is then again
ready for use.
NOTICE
The stopper inside the connections must not be removed!
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Bühler Technologies GmbH
BE550013 ◦ 09/2018
