ISO 11171:2022
Hydraulic fluid power — Calibration of automatic particle counters for liquids
This document specifies procedures for the following:
a) primary particle-sizing calibration for particle sizes 1 µm(c) and larger, sensor resolution and counting performance of liquid automatic particle counters that are 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 test dust;
e) 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 NIST SRM 2806b primary calibration suspensions.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and equipment
5 Sequence of APC calibration procedures
6 Sizing calibration procedure
7 Data presentation
8 Identification statement
Annex A (normative) Preliminary APC check
Annex B (normative) Coincidence error procedure
Annex C (normative) Flow rate limit determination
Annex D (normative) Resolution determination
Annex E (normative) Verification of particle-counting accuracy
Annex F (normative) Preparation and verification of bottles of secondary calibration suspensions
Annex G (normative) Dilution of calibration suspension samples
Annex H (informative) Verification of particle size distribution of calibration samples
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and equipment
5 Sequence of APC calibration procedures
6 Sizing calibration procedure
7 Data presentation
8 Identification statement
Annex A (normative) Preliminary APC check
Annex B (normative) Coincidence error procedure
Annex C (normative) Flow rate limit determination
Annex D (normative) Resolution determination
Annex E (normative) Verification of particle-counting accuracy
Annex F (normative) Preparation and verification of bottles of secondary calibration suspensions
Annex G (normative) Dilution of calibration suspension samples
Annex H (informative) Verification of particle size distribution of calibration samples
Bibliography