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This International Standard specifies procedures for the following: a) primary particle-sizing calibration, sensor resolution and counting performance of automatic particle counters (APCs) for liquids capable of analysing bottle samples; b) secondary particle-sizing calibration using suspensions verified with a primary calibrated APC; c) establishing acceptable operation and performance limits; d) verifying particle sensor performance using a truncated test dust; e) determining coincidence and flow rate limits. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3722, Hydraulic fluid power — Fluid sample containers — Qualifying and controlling cleaning methods ISO 5598, Fluid power systems and components — Vocabulary ISO 12103-1, Road vehicles — Test dust for filter evaluation — Part 1: Arizona test dust ISO 16889, Hydraulic fluid power — Filters — Multi-pass method for evaluating filtration performance of a filter element