ISO 4406-2017 pdf free.Hydraulic fluid power — FluidsMethod for coding the level ofcontamination by solid particles.
This document specifies the code to be used in defining the quantity of solid particles in the fluid usedin a given hydraulic fluid power system.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.Forundated references, the latest edition of the referenced document(including any amendments) applies.IS0 4407,Hydraulic fluid power — Fluid contamination —Determination of particulate contamination bythe counting method using an optical microscope
ISo 11171,Hydraulic fluid power —Calibration of automatic particle counters for liquids
IS0 11500,Hydraulic fluid power —Determination of the particulate contamination level of a liquid sampleby automatic particle counting using the light-extinction principle
The purpose of this code is to simplify the reporting of particle count data by converting the numbersof particles into broad classes or codes,where an increase in one code is generally a doubling of thecontamination level.
The original code, in accordance with the first edition of this document, stated the reporting at twosizes 2 5 um and ≥ 15 um.The sizes in this document account for the use of a different calibrationstandard for optical automatic particle counters (APCs).The reported sizes are 2 4 m(c),2 6 um(c) and2 14 um(c), the last two of these being equivalent to the 5 um and 15 um particle sizes obtained usingthe lSo 4402:19911) method of calibrating APCs. Throughout this document the use of um(c) meansthat particle size measurements are carried out using an automatic particle counter that has beencalibrated in accordance with lSO 11171.
Measurement of particles using an optical microscope as specified in IlSO 4407 establishes the size ofa particle as being equal to its longest dimension, whereas an automatic particle counter derives thesize of an equivalent particle from its cross-sectional area, a value different in most cases from thatdetermined using a microscope. The particle sizes to be reported for measurement by microscope2 5 um and 2 15 um are unchanged from those specified in the first edition of this document.ISO 4406 pdf download.