system during sterilisation. Properties of the H 2 O 2 filter: The filter cap consists of a PTFE sin- ter filter, in which a catalyst is embed - ded. The catalyst decomposes the H 2 O 2 into harmless water and oxy- gen, so that the humidity sensor in the filter cap is not exposed to H 2 O 2 and no drift occurs. With the aid of the filter cap the rela- tive humidity can also be measured during the phases of H 2 O 2 applica- tion. This is

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