ISO 5884:1987

Aerospace — Fluid systems and components — Methods for system sampling and measuring the solid particle contamination of hydraulic fluids

Specifies procedures for determining the level of contamination. Three procedures are specified herein: microscopic method, automatic particle counting method and gravimetric method. In addition lays down the procedures for cleaning the apparatus and sample bottles, and specifies the solvents to be applied and how these solvents shall be prepared. Requirements as to the selection of the sampling point and to different sampling methods are also specified.