1、BRITISH STANDARD BS ISO 4407:2002 Hydraulic fluid power Fluid contamination Determination of particulate contamination by the counting method using an optical microscope ICS 23.100.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 4407:2002 This British Standard, having
2、 been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 21 May 2002 BSI 21 May 2002 ISBN 0 580 39724 6 National foreword This British Standard reproduces verbatim ISO 4407:2002 and
3、 implements it as the UK national standard. It supersedes BS 5540-8:1991 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommittee MCE/18/-/6, Contamination control, which has the responsibility to: A
4、list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Inter
5、national Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a
6、British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related internationa
7、l and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates
8、 when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 4407:2002(E) OSI 2002INTERNATIONAL STANDARD ISO 4407 Second edition 2002-04-15 Hydraulic fluid power Fluid contamination Determination of particulate contamination by the counting meth
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14、ail cirypothgiso.ch Web ww.wiso.ch ii I SO 2002 All irthgs ersedevr ISO 4407:2002(E) I SO 2002 All irthgs ersedevr iiiContents Page Foreword.iv Introduction.v 1 Scope 1 2 Normative references1 3 Terms and definitions .2 4 Counting principle .4 5 Apparatus .4 6 Reagent and chemicals.6 6.1 Reagent and
15、 rinsing and cleaning chemicals 6 6.2 Liquids for transparentizing the membrane filter (transmitted-light method) 6 7 Glassware cleaning procedure 6 8 Calibration procedures .6 8.1 Microscope calibration6 8.2 Determination of Effective Filtration Area (EFA)7 9 Membrane filter preparation .7 9.1 Samp
16、le preparation .7 9.2 Blank analysis8 9.3 Separation of contaminants by vacuum filtration8 9.4 Evaluation of suitability for counting 9 9.5 Mounting of membrane filters for observation under transmitted light 10 10 Particle sizing and counting procedure 10 10.1 Particle sizing.10 10.2 Selection of n
17、ominal magnification .10 10.3 Statistical counting procedure.10 10.4 Calculation of total count11 10.5 Verification of data 12 11 Expression of results 13 12 Identification statement (Reference to this International Standard).13 Bibliography14 ISO 4407:2002(E) iv I SO 2002 All irthgs ersedevr Forewo
18、rd ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technic
19、al committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of el
20、ectrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to t
21、he member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held resp
22、onsible for identifying any or all such patent rights. ISO 4407 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control and hydraulic fluids. This second edition cancels and replaces the first edition (ISO 4407:1991), which has been technically r
23、evised. ISO 4407:2002(E) I SO 2002 All irthgs ersedevr vIntroduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. The liquid is both a lubricant and power transmitting medium. The presence of particulate contaminati
24、on in the liquid interferes with its ability to lubricate and causes wear to the components. The level of contamination in the liquid has a direct bearing on the performance and reliability of the system, and should be controlled to a level appropriate for the system concerned. Quantitative determin
25、ation of particulate contamination requires precision in obtaining a representative sample of the liquid and in determining the level of contamination. The method of particle counting using the optical microscope is an accepted means of determining the extent of contamination. The accuracy of partic
26、le count data can be affected by the techniques used. This International Standard details procedures for the separation of particles in liquid samples by vacuum filtration and subsequent analysis of the particles deposited on an analytical membrane filter by microscopic techniques. The techniques involve counting using transmitted or incident light both manually and using image analysis techniques. This International Standard specifies methods to ensure accurate and consistent results.
