Replace Port Filters

A porous metal filter is located in the analysis port and in each degas port. If a filter on a degas port is contaminated, the contaminant may adsorb atmospheric gases when the port is not plugged with either a sample tube or plug, resulting in extended degassing time for samples on that port. Using a contaminated filter on the analysis port may extend the time required to achieve a vacuum at that port and the contaminant may also adsorb or desorb during analysis, affecting the analysis results. A contaminated filter on the analysis port may be detected by a leak test (if the contaminant outgasses) or by a free space reading much lower than normal.

 
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