The supported standards have common characteristics.

• Distribution of particle size classes
• Definition of particle size classes as cumulative (open size intervals) or differential (closed size intervals) particle counts
• Core measurement parameter (in general: Feret Max) which is used for particle size classification
• Translation of particle numbers in cleanliness level (cleanliness codes or levels)
• Definition of particle numbers as cleanliness classes
• Normalization and Standardization of particle counting results
• Normalized particle number (absolute particle number divided by a factor)
• Standardized particle number (expressing normalized particle numbers in terms of a given standard value of normalized particle numbers to a standard value)

Effective Filter Area

Analysis of the complete flow through area (effective filter area) is mandatory for component cleanliness standards, oil cleanliness allows the analysis of a smaller area and extrapolation of the results to consider the effective filter area.

1	Filter Area
2	Effective Filter Area

The measurement frame which is defined in the Tiles (measurement) workbench by the diameter is the base for the standard specific calculation of: (1) normalized and standardized values; (2) occupancy rate.

Cleanliness testing of components or medical devices: the measurement frame must cover as a minimum the effective filter area. Note that according to VDA 19.1 or ISO 16232 the complete effective filter area must be analyzed.