ISO 11500:2008 PDF

Scope: This International Standard 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 International Standard 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. NOTE 1 Measurements can be made with particles suspended in the original liquid or in a sample of the liquid diluted with a compatible liquid to reduce coincidence error. NOTE 2 The presence of a fluid interface obstructs the light beam and gives false signals.

ISO 11500:2008 Referenced Document

ISO 11171:1999 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*， 2020-12-31 Update
ISO 5598 Fluid power systems and components — Vocabulary*， 2020-01-06 Update

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