BS ISO 11171:2020

This document specifies procedures for the following: primary particle-sizing calibration for particle sizes 1µm(c) and larger, sensor resolution and counting performance of liquid automatic particle counters that are capable of analysing bottle samples; secondary particle-sizing calibration using suspensions verified with a primary calibrated APC; establishing acceptable operation and performance limits; verifying particle sensor performance using a test dust; determining coincidence and flow rate limits. This document is applicable for use with hydraulic fluids, aviation and diesel fuels, engine oil and other petroleum-based fluids. This document is not applicable to particle-sizing calibration using NISTSRM2806b primary calibration suspensions.