ISO 11500:2022 PDF

Scope: This document specifies an automatic particle counting procedure for determining the number and sizes of particles present in hydraulic-fluid bottle samples of clear, homogeneous, single-phase liquids using an automatic particle counter (APC) that works on the light-extinction principle. This document is applicable to the monitoring of: a) the cleanliness level of fluids circulating in hydraulic systems; b) the progress of a flushing operation; c) the cleanliness level of support equipment and test rigs; d) the cleanliness level of packaged stock fluid. NOTE Measurements can be made with particles suspended in the original liquid or in a sample of the liquid diluted with a compatible liquid when APC coincidence error limits are exceeded.

ISO 11500:2022 Referenced Document

ISO 11171:2022 Hydraulic fluid power — Calibration of automatic particle counters for liquids
ISO 3722 Hydraulic fluid power; Fluid sample containers; Qualifying and controlling cleaning methods
ISO 4406 Hydraulic fluid power - Fluids - Method for coding the level of contamination by solid particles
ISO 5598 Fluid power systems and components — Vocabulary

2022 ISO 11500:2022 Hydraulic fluid power — Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle
2008 ISO 11500:2008 Hydraulic fluid power - Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle
1998 ISO 11500:1997/Cor 1:1998 Hydraulic fluid power - Determination of particulate contamination by automatic counting using the light extinction principle; Technical Corrigendum 1
1997 ISO 11500:1997 Hydraulic fluid power - Determination of particulate contamination by automatic counting using the light extinction principle