BS ISO 11500-2008 Hydraulic fluid power - Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principl.pdf

1、BS ISO11500:2008ICS 23.100.60NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHydraulic fluid power Determinationof the particulatecontamination levelof a liquid sample byautomatic particlecounting using thelight-extinctionprincipleThis British Standardwas publis

2、hed under the authority of theStandards Policy andStrategy Committee on 32008 BSI 2008ISBN 978 0 580 55546 6Amendments/corrigenda issued since publicationDate CommentsBS ISO 11500:2008National forewordThis British Standard is the UK implementation of ISO 11500:2008. Itsupersedes BS ISO 11500:1997 wh

3、ich is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/6, Contamination control.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof

4、a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.1 OctoberBS ISO 11500:2008Reference numberISO 11500:2008(E)ISO 2008INTERNATIONAL STANDARD ISO11500Second edition2008-09-01Hydraulic fluid power Determination

5、of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle Transmissions hydrauliques Dtermination du niveau de pollution particulaire dun chantillon liquide par comptage automatique des particules par absorption de lumire BS ISO 115

6、00:2008ISO 11500:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. I

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9、dress given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either I

10、SO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 11500:2008ISO 11500:

11、2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Materials and equipment 2 5 Diluent liquid . 3 6 Pre-test requirements and procedures. 3 6.1 Precautions . 3 6.2 Glassware cleaning procedure 4 6.3 APC

12、 calibration procedure 4 6.4 APC operation . 4 6.5 Sample inspection and preparation before counting . 5 6.6 Determination of need for sample dilution. 7 7 Procedure for determining the particulate contamination level by automatic counting 7 7.1 Outline 7 7.2 Sample dilution . 9 7.3 Analysis procedu

13、re. 11 7.4 Analysis of different liquids. 12 8 Test report . 12 9 Identification statement (reference to this International Standard) . 13 Annex A (normative) Procedure for performing a statistical check of an automatic particle counter. 14 Annex B (informative) Acceptable diluents . 15 Annex C (inf

14、ormative) Method for pre-cleaning diluent and method for incorporating additives into the diluent to eliminate the influence of static electricity on particle counts. 16 Annex D (informative) Form for reporting particulate contamination level in a hydraulic liquid sample as determined by automatic c

15、ounting 18 Annex E (informative) Data from round robin test program conducted to verify the procedure specified in ISO 11500 19 Bibliography . 29 BS ISO 11500:2008ISO 11500:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federat

16、ion 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 technical committee has been established has the right to be represented on that committe

17、e. 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 electrotechnical standardization. International Standards are drafted in accordance

18、with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires app

19、roval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11500 was prepared by Technical Commi

20、ttee ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control. This second edition cancels and replaces the first edition (ISO 11500:1997), which has been technically revised, specifically with the following major differences: a) inclusion of a “quick check” method to determine the

21、presence of water in the sample; b) update of the method for calibrating the automatic particle counter (APC) from ISO 44021)to ISO 11171; c) elimination of requirement to analyse samples in a class 100 000 clean room; d) improved dilution methods; e) improved guidelines on APC operation, including

22、guidance for detecting and overcoming coincidence error; f) revision of how to check the validity of the reported particle count. It also incorporates the Technical Corrigendum ISO 11500:1997/Cor. 1:1998. 1) ISO 4402, Hydraulic fluid power Calibration of automatic-count instruments for particles sus

23、pended in liquids Method using AC Fine Test Dust contaminant. Withdrawn and revised by ISO 11171. BS ISO 11500:2008ISO 11500:2008(E) ISO 2008 All rights reserved vIntroduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed cir

24、cuit. The liquid is both a lubricant and a power-transmitting medium. The presence of solid contaminant particles in the liquid interferes with the ability of the hydraulic fluid to lubricate and causes wear to the components. The extent of contamination in the fluid has a direct bearing on the perf

25、ormance and reliability of the system and it is necessary to control solid contaminant particles to levels that are considered appropriate for the system concerned. A quantitative determination of particulate contamination requires precision in obtaining the sample and in determining the extent of c

26、ontamination. The liquid automatic particle counter (APC), which works on the light-extinction principle, has become an accepted means of determining the extent of contamination. The accuracy of particle count data can be affected by the techniques used to obtain such data. This International Standa

27、rd details procedures for the analysis of contaminated liquid samples using an automatic particle counter. Correct use of an automatic particle counter helps to reduce errors and enhances the accuracy of reproducibility in data. BS ISO 11500:2008BS ISO 11500:2008INTERNATIONAL STANDARD ISO 11500:2008

28、(E) ISO 2008 All rights reserved 1Hydraulic fluid power Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle 1 Scope This International Standard specifies an automatic particle counting procedure for determining t

29、he 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 fl

30、uids 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 dilute

31、d with a compatible liquid to reduce coincidence error. NOTE 2 The presence of a fluid interface obstructs the light beam and gives false signals. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition

32、cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 contamina

33、tion by solid particles ISO 5598, Fluid power systems and components Vocabulary ISO 11171:1999, Hydraulic fluid power Calibration of automatic particle counters for liquids BS ISO 11500:2008ISO 11500:2008(E) 2 ISO 2008 All rights reserved3 Terms and definitions For the purposes of this document, the

34、 terms and definitions given in ISO 5598 and ISO 11171:1999 and the following apply. 3.1 agglomerate two or more particles that are in intimate contact and cannot be separated by gentle stirring and the small shear forces thus generated 3.2 coincidence error limit highest concentration of ISO ultraf

35、ine test dust (ISO 12103-1, A1, or ISO UFTD) that can be counted with an automatic particle counter with less than 5 % error resulting from the presence of more than one particle in the sensing volume at a time ISO 11171:1999, 3.4 3.3 light extinction reduction in intensity of a light beam passing t

36、hrough the sensing volume caused by the interaction of the light with single particles NOTE This is also known as light blockage or light obscuration. 3.4 sensing volume portion of the illuminated region of the sensor through which the fluid stream passes and from which the light is collected by the

37、 optical system ISO 11171:1999, 3.2 3.5 threshold noise level minimum voltage setting of the particle counter at which the observed pulse-counting frequency does not exceed 60 counts/min due to electrical noise ISO 11171:1999, 3.1 4 Materials and equipment 4.1 Automatic particle counter (APC) for li

38、quids, based on the light-extinction principle, consisting of an instrument to size and record the electrical signals generated when a single particle passes through a sensor for counting within the specified range. The APC shall be capable of cumulative counting. The APC shall include an automatic

39、bottle-sampling apparatus or a means of moving the sample liquid through the sensor and then into a calibrated volumetric measuring device without altering the particle size distribution of the sample. 4.2 Bottle sampler, used to transfer the liquid being analysed through a sensor, which may be an a

40、uxiliary component or a part of the APC itself. If gas is used to force the liquid through the sensor, the gas shall be filtered through a 0,45 m filter and shall be free from oil and water. 4.3 Density meter, with an accuracy of 0,001 g/cm3, if the mass-dilution method is used. 4.4 Electronic balan

41、ce, calibrated, with a resolution of 0,1 mg or better. BS ISO 11500:2008ISO 11500:2008(E) ISO 2008 All rights reserved 34.5 Hot plate, capable of heating to 150 C 2 C. 4.6 Sample-agitating device, such as a laboratory bottle roller or paint shaker, capable of re-dispersing the contaminant in the liq

42、uid sample without altering the basic particle size distribution of the contaminant. 4.7 Sample bottles, normally cylindrical bottles made of glass or high-density polyethylene, fitted with either a non-shedding, threaded cap forming a seal with the bottle without the use of an insert, or a cap with

43、 an internal seal. The dimensions of the bottle depend upon the type of sample-bottle facility in use with the APC, but bottles should normally have a capacity of 250 mL. The bottle should be flat-bottomed and wide-necked to facilitate cleaning. The sample bottles shall be cleaned and verified in ac

44、cordance with ISO 3722. NOTE It has been found that a cleanliness level of fewer than 10 particles 4 m(c) and fewer than 2 particles 6 m(c) per millilitre of sample-bottle volume is adequate. 4.8 Liquid dispensers, fitted with a 0,45 m membrane filter directly at the outlet. 4.9 Temperature-measurin

45、g device, calibrated, with an accuracy of 1 C or better. 4.10 Timer, capable of measuring minutes and seconds, calibrated, with an accuracy of 0,1 s or better. 4.11 Ultrasonic bath, rated at a power intensity of 3 000 W/m2to 11 000 W/m2of the base area, which has been shown to be an acceptable means

46、 of both dispersing agglomerated particles within the liquid and removing air introduced by manual agitation. 4.12 Volumetric glassware, consisting of a range of calibrated graduated cylinders and graduated syringes or dosing pipettes (standard total displacement volumetric ware with multiple markin

47、gs or air displacement) conforming to an appropriate standard and cleaned and verified in accordance with 6.2. NOTE Examples of appropriate standards for volumetric glassware include ISO 4788 and ISO 8655 (all parts). 5 Diluent liquid NOTE Observe standard laboratory safety practices and regulations

48、 when handling diluents. 5.1 The diluent liquid shall be cleaned to contain fewer than 15 particles 4 m(c) per millilitre. 5.2 The diluent liquid shall be physically and chemically compatible with both the sample liquid and the apparatus used. NOTE See Annex B for examples. 5.3 Care shall be taken t

49、o ensure that the diluent does not affect the particle counts. NOTE See Annex C for information about a method for pre-cleaning the diluent. 6 Pre-test requirements and procedures 6.1 Precautions 6.1.1 Chemicals Good laboratory practices should be observed in the preparation and use of chemicals used in these procedures, as they can be harmful, toxic or flammable. Take care to ensure compatibility of the chemicals with the materials used. Refer to the material safety data sheet (MSDS) for each chemical and follo