1、BS ISO 11171:2016Hydraulic fluid power Calibration of automaticparticle counters for liquidsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 11171:2016 ISO 2016Hydraulic fluid power Calibration of automatic particle counters for liquidsTransmissions hydraulique
2、s talonnage des compteurs automatiques de particules en suspension dans les liquidesINTERNATIONALSTANDARDISO11171Third edition2016-10-01Reference numberISO 11171:2016(E)BS ISO 11171:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11171:2016. It supersedes
3、BS ISO 11171:2010 which is withdrawn.Attention is drawn to the fact that the UK committee voted against the approval of this International Standard.The UK committee has concerns that there are three options for presenting data which will give significant differences in particle counts when analysing
4、 the same fluid with automatic particle counters (APCs). The difference in particle counts is because the previous calibration suspensions, SRM 2806 and 2806a, where the calibrated size is labelled “m(c)”, are no longer available. The latest characterization of the particle sizes by electron microsc
5、ope has shown that there is an increase in size of the same particles. The result is that calibration using SRM 2806b results in higher particle counts compared to calibration using SRM 2806 or SRM 2806a, when testing the same fluid.Clause 6.8 of this standard describes the process for constructing
6、an additional calibration curve so that an APC calibrated using SRM 2806b can give results equivalent to the earlier standard that used SRM 2806 or SRM 2806a when option 7.1 b) is selected, but use of this is not required when reporting to options 7.1 a) and 7.1 c).Any standard using APCs calibrated
7、 to ISO 11171 will be affected by these changes e.g. ISO 4406. It is beyond the scope of this standard to state how to apply the results derived in clause 7.1 to generate ISO 4406 codes. At the time of publication, ISO 4406 has not been revised to account for these changes and the UK committee sugge
8、sts, therefore, that the ISO Code is followed by: “m” if option 7.1 a) is chosen; “m(c)” if option 7.1 b) is chosen, or “m(b)” if option 7.1 c) is chosen.The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommittee MCE/18/-/
9、6, Contamination control.A list of organizations represented on this subcommittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution
10、2016. Published by BSI Standards Limited 2016ISBN 978 0 580 92671 6ICS 23.100.60; 75.120Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2016.Amendment
11、s/corrigenda issued since publicationDate Text affectedBS ISO 11171:2016 ISO 2016Hydraulic fluid power Calibration of automatic particle counters for liquidsTransmissions hydrauliques talonnage des compteurs automatiques de particules en suspension dans les liquidesINTERNATIONAL STANDARDISO11171Thir
12、d edition2016-10-01Reference numberISO 11171:2016(E)BS ISO 11171:2016ISO 11171:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in
13、any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Bla
14、ndonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 11171:2016ISO 11171:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Materials and equipment 25 Sequence of APC calibration pr
15、ocedures 46 Sizing calibration procedure 77 Data presentation .138 Identification statement 14Annex A (normative) Preliminary APC check 15Annex B (normative) Coincidence error procedure 18Annex C (normative) Flow rate limit determination 23Annex D (normative) Resolution determination 27Annex E (norm
16、ative) Verification of particle-counting accuracy 32Annex F (normative) Preparation and verification of bottles of secondary calibration suspensions .35Annex G (informative) APC calibration round robin .38Annex H (informative) Sample calculations.43Annex I (informative) Verification of particle size
17、 distribution of calibration samples 49Bibliography .51 ISO 2016 All rights reserved iiiContents PageBS ISO 11171:2016ISO 11171:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing In
18、ternational 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 committee. International organizations, governmental and non-governmental, in liaison
19、with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directiv
20、es, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some
21、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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarati
22、ons received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about
23、 ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control.This third edition
24、cancels and replaces the second edition (ISO 11171:2010), of which it constitutes a minor revision.This edition includes the following significant changes with respect to the previous edition: 6.8: defining m equation, Table 3 revised to show m(b) and m(c) to be reported; 7.1: revised to show how to
25、 report m(b) and m(c).iv ISO 2016 All rights reservedBS ISO 11171:2016ISO 11171:2016(E)IntroductionIn hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. The fluid is both a lubricant and a power-transmitting medium. Reliable
26、 system performance requires control of the contaminants in the fluid. Qualitative and quantitative determination of the particulate contaminants in the fluid medium requires precision in obtaining the sample and in determining the contaminant particle size distribution and concentration. Liquid aut
27、omatic particle counters (APCs) are an accepted means of determining the concentration and size distribution of the contaminant particles. Individual APC accuracy is established through calibration.This International Standard establishes a recommended standard calibration procedure for determining p
28、article sizing and counting accuracy. The primary particle-sizing calibration is conducted using NIST SRM 2806 suspensions with particle size distribution certified by the United States National Institute of Standards and Technology (NIST). A secondary calibration method with traceability to NIST us
29、es suspensions of ISO MTD which are independently analysed using an APC calibrated by the primary method. Concentration limits are determined through the use of serial dilutions of a concentrated suspension. Operation and performance limits are also established using this International Standard. ISO
30、 2016 All rights reserved vBS ISO 11171:2016BS ISO 11171:2016Hydraulic fluid power Calibration of automatic particle counters for liquids1 ScopeThis International Standard specifies procedures for the following:a) primary particle-sizing calibration, sensor resolution and counting performance of aut
31、omatic particle counters (APCs) for liquids capable of analysing bottle samples;b) secondary particle-sizing calibration using suspensions verified with a primary calibrated APC;c) establishing acceptable operation and performance limits;d) verifying particle sensor performance using a truncated tes
32、t dust;e) determining coincidence and flow rate limits.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest e
33、dition of the referenced document (including any amendments) applies.ISO 3722, Hydraulic fluid power Fluid sample containers Qualifying and controlling cleaning methodsISO 5598, Fluid power systems and components VocabularyISO 12103-1, Road vehicles Test dust for filter evaluation Part 1: Arizona te
34、st dustISO 16889, Hydraulic fluid power Filters Multi-pass method for evaluating filtration performance of a filter element3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.3.1automatic particle counterAPCinstrument that aut
35、omatically counts and sizes individual particles suspended in a fluid, typically relying on optical light scattering or light extinction principles of particle sizingNote 1 to entry: An APC consists of, at a minimum, a particle sensor, a means for delivering a known volume of sample to the sensor at
36、 a controlled rate, a signal processor, an analyser that compiles the sensor output for the sizes of individual particles into particle size distribution and a means for outputting particle size distribution results for the sample.3.2threshold noise levelminimum voltage setting of an automatic parti
37、cle counter at which the observed pulse-counting frequency does not exceed 60 counts/min due to electrical noise in the absence of flow in the sensing volumeINTERNATIONAL STANDARD ISO 11171:2016(E) ISO 2016 All rights reserved 1BS ISO 11171:2016ISO 11171:2016(E)3.3sensing volumeportion of the illumi
38、nated region of the sensor through which the fluid stream passes and from which the light is collected by the optical system3.4resolutionmeasure of the ability of an automatic particle counter to distinguish between particles of similar, but different, sizes3.5coincidence error limithighest concentr
39、ation of NIST RM 8632 that can be counted with an automatic particle counter with an error of less than 5 % resulting from the presence of more than one particle in the sensing volume at one time3.6working flow rateflow rate through the sensor used for sizing calibration and sample analysis3.7partic
40、le sizeprojected area equivalent diameter of particles as determined using scanning electron microscopy or as determined using a calibrated liquid optical single particle automatic particle counterNote 1 to entry: Unless otherwise stated, an APC used for particle size determination is calibrated in
41、accordance with this International Standard.Note 2 to entry: NIST uses scanning electron microscopy to determine the projected area equivalent diameter of particles in its reference materials.3.8particle size distributionnumber concentration of particles, expressed as a function of particle size3.9p
42、rimary calibrationsizing calibration conducted using NIST standard reference material 2806xNote 1 to entry: The procedure is specified in Clause 6.Note 2 to entry: For details of NIST standard reference material 2806x, see 4.4.3.10secondary calibrationsizing calibration conducted using calibration s
43、uspensionsNote 1 to entry: The procedure is specified in Clause 6 and the calibration suspensions are prepared in accordance with Annex F.4 Materials and equipment4.1 Polystyrene latex spheres, nearly monodispersed in aqueous suspension. Polystyrene latex spheres with a nominal diameter of 10 m are
44、required in Annex D for resolution determination and polystyrene latex spheres with other nominal diameters larger than 50 m are required in Clause 6, if size calibration for particle sizes of 50 m and larger is performed. In certain situations, it may also be useful to use additional sphere sizes.
45、Regardless, the coefficient of variation of each polystyrene latex sphere size shall be less than 5 %. The supplier of the polystyrene latex spheres shall provide a certificate 2 ISO 2016 All rights reservedBS ISO 11171:2016ISO 11171:2016(E)of analysis with each batch, which indicates that the spher
46、e particle size has been determined using techniques with traceability to National or International Standards.Once opened, suspensions of polystyrene latex spheres shall be used within three months unless the size distribution and cleanliness of the suspension have been verified.NOTE 1 The size dist
47、ribution and cleanliness of polystyrene latex spheres can be verified using the method described in D.13.NOTE 2 Polystyrene latex spheres in aqueous suspension have a limited shelf-life. Shelf-life is a function of a variety of factors including temperature and microbial contamination of the suspens
48、ion.4.2 Clean dilution fluid, consisting of the test fluid used in ISO 16889 and an antistatic additive that gives a conductivity of 2 500 pS/m 1 000 pS/m at room temperature. The fluid shall contain less than 0,5 % of the number of particles equal to or larger than the smallest particle size of int
49、erest expected to be observed in the samples.4.3 Clean aerosol OT dilution fluid, to determine sensor resolution in Annex D (the clean dilution fluid specified in 4.2 is used for all other operations in this International Standard). It is prepared from a concentrate made by adding 120 g of aerosol OT to each litre of clean dilution fluid (4.2). Heat the concentrate to about 60 C and stir until the aerosol OT has completely dissolved. Prepare the aerosol OT dilution fluid by diluting the concentrate with clean di
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