90.92 Standard to be revised Aug 31, 2026
ISO
ISO/TC 131/SC 6 Contamination control
International Standard
23.100.60 Filters, seals and contamination of fluids
This document establishes methods for:
— validating equipment used to prepare secondary calibration suspensions for automatic particle counters;
— performing online secondary calibration of automatic particle counters;
— matching two or more online particle counters, i.e. to count the same number of particles at a given size by two APCs associated online;
— validating online particle counting systems with and without online dilution as used, for example, to measure the filtration efficiency of a hydraulic filter as described in the multi-pass filter test in ISO 16889.
WITHDRAWN
ISO 11943:2018
PUBLISHED
ISO 11943:2021
90.92
Standard to be revised
Aug 31, 2026