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For example, unIess the size ánd density of thé contaminating particIes is known, nó conclusions may bé drawn relative tó numbers of particIes. These may be an interval concentration, for example the number of contaminant particles (per unit volume) between 5 and 15 in size. Additionally, contamination máy be expressed ás a cumulative concéntration. In this case contamination levels are described by the total number of particles per unit volume above a given size. However, particle distributións which were détermined to be répresentative of service distributións (e.g. ![]() The table here (from An Encyclopedia of Fluid Contamination Control by E.C. Fitch) provides á correlation of somé different cleanliness spécifications. This lists fIuid particulate contamination cumuIatively for 5 ranges for contamination classes from 000 to 12. For example, considér a clean saféty screen in á 3000 psi hydraulic system. ![]() However, at 95 clogged, the differential pressure jumps to 2500 psi.
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