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1、BRITISH STANDARD BS ISO 6644:2002 Flowing cereals and milled cereal products Automatic sampling by mechanical means ICS 67.060 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6644:2002 This British Standard, having been prepared und
2、er the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 16 December 2002 BSI 16 December 2002 ISBN 0 580 40951 1 National foreword This British Standard reproduces verbatim ISO 66
3、44:2002 and implements it as the UK national standard. It supersedes BS 6298:1982 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/4, Cereals and pulses, which has the responsibility to: A list of organizations represented on this committee can be o
4、btained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BS
5、I Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquire
6、rs 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 international and European developments and promulgate them in the UK. Summary of pages This docume
7、nt comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 9 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sh
8、effieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 6644 Second edition 2002-12-01 Reference number ISO 6644:2002(E) Flowing cereals and milled cereal products Automatic sampling by mechanical means Crales et produits de mouture des crales en mouv
9、ement chantillonnage automatique par des moyens mcaniques BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO :4466(2002)E ii FDP dicslaimre This FDP fam elitnoc yt deddebme niayfep.seca In roccatiw ecnadA hycilop gnisnecil
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14、11 Fxa + 14 47 2290 9 74 E-liam cpoyrigthsio.ch Web wwwsi.oc.h BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national stand
15、ards 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 committee. International orga
16、nizations, 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 with the rules given
17、in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the 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
18、that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 6644 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 4, Cereals and
19、pulses. This second edition cancels and replaces the first edition (ISO 6644:1981), which has been technically revised. Annex A of this International Standard is for information only. BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy,
20、(c) BSI iv Introduction Correct sampling is an operation that requires most careful attention. Therefore emphasis cannot be too strongly laid on the necessity of obtaining a properly representative sample of cereal grain or milled product. Careless or inaccurate sampling could lead to misunderstandi
21、ng and to unwarranted financial adjustment. The procedures given in this International Standard are recognized as good practice and it is strongly recommended that they be followed whenever practicable. It is difficult to lay down fixed rules to be followed in every case, and particular circumstance
22、s may render some modification of the method desirable. For example, determination of qualitative factors, such as moisture content, is best achieved by examination of the laboratory sample, whereas a quantitative factor, such as detection of insects, is best achieved by examination of individual in
23、crements. BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ANRETNIITOTS LANDNADRAISO 4662002:4)E( 1 Flowing cereals and milled cereal products Automatic sampling by mechanical means 1Scope This International Standard specifie
24、s requirements for the automatic sampling, by mechanical means, of cereals (as grain) or of milled cereal products moving in bulk, for assessment of their quality. It is not applicable to commodities in sacks or in packages, to static bulks in wagons, ships, bulk tankers, silos or warehouses1). It d
25、oes not apply to seed grain. 2Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, this publication do not apply. However,
26、 parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC ma
27、intain registers of currently valid International Standards. ISO 13690, Cereals, pulses and milled products Sampling of static batches 3Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 consignment quantity of product dispatched or
28、received at one time and covered by a particular contract or shipping document NOTEIt may be composed of one or more lots. 3.2 lot stated portion of a consignment NOTEUnless otherwise specified in the contract, consignments should be considered in lots of up to 500 tonnes. 3.3 increment small quanti
29、ty taken from the product stream during a stated short period of time 3.4 bulk sample quantity of product obtained by combining and mixing thoroughly the increments taken from a specific lot, or obtained from a continuously taken sample allowed to accumulate NOTEFor recommendations on achieving a ho
30、mogenous mix of large quantities of sampled product, see ISO 13690. 1)For sampling of cereals as grain, see ISO 13690. BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 3.5 laboratory sample quantity of product divided accor
31、ding to instructions given in ISO 13690 and removed from the bulk sample, and intended for analysis or other examination 3.6 flowing product product to be sampled moving through a conveying system, or in free-fall from a spout or chute 4General requirements 4.1Arrangements for fixed or temporary aut
32、omatic sampling shall be made jointly by the interested parties. 4.2The purpose of sampling is to obtain a sample corresponding in characteristics and composition with the lot from which it was taken. Therefore, the mechanical sampling device, having been installed, suitably adjusted and set in oper
33、ation, shall automatically take an increment or a series of increments from a lot. Such increment or increments may be taken continuously, or intermittently and repeatedly, depending on the device used. 4.3It is normal practice that a product which is sea-damaged or suspected of being contaminated,
34、damaged or out of condition is kept separate from the sound product and is sampled separately. Samples of the unsound material shall not be mixed with samples of the sound material. 4.4Special care is necessary to ensure that all parts of the sampler are clean, dry and free from foreign odours. 4.5S
35、ampling shall be carried out in such a manner as to protect the samples, the sampler, and the containers in which the samples are placed, from contamination such as rain or dust. In the case of products for human consumption, the installation shall comply with relevant food safety legislation. 5Requ
36、irements for apparatus 5.1General Mechanical sampling equipment shall be capable of taking increments from the entire cross section, or as much of the cross section as possible, of the flowing bulk material. Annex A gives descriptions of the general types of automatic sampling devices and illustrati
37、ons of examples of such types. 5.2Adjustment The equipment shall be capable of adjustment such that the size of increments and frequency at which they are taken can be varied over the desired wide ranges. 5.3Access Each sampler shall be provided with suitable access for convenient inspection, cleani
38、ng, maintenance and repair of all wearing surfaces, and for sampling verification. Access equipment should be constructed of materials that will not generate an electrostatic charge. 5.4Safety The installation shall comply with all applicable safety requirements, including adequate illumination for
39、inspection, operation and maintenance. When used in a potentially dusty environment, the operator should wear a suitable respirator. BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 5.5Location 5.5.1In general it is advisab
40、le to take samples from a point as close as possible to the place where the commodity being sampled changes ownership (e.g. just before the loading of a wagon or vessel). 5.5.2Products moving in bulk may be sampled, for example, when moving on a conveyor belt, or in an inclined conduit, or when movi
41、ng in air streams as in a pneumatic lift or conveyor, or when falling from a spout or the end of a conveyor belt. 5.5.3When sampling grain from a spout, it is important that the velocity of the stream does not cause breakage of the grains. Therefore the apparatus shall be installed not more than fro
42、m the weighing machine, bin, head of bucket elevator, or discharge point of a pneumatic elevator cyclone. The slope of the spout shall be not less than from horizontal to avoid separation of smaller/lighter fractions from larger/heavier elements within the stream. 5.5.4When sampling grain from a con
43、veyor belt, the apparatus shall be installed at least from the nearest feeder, turn-head or place where the grain is fed onto the conveyor belt or band, to allow the grain stream elements to achieve near equilibrium a maximum distance of . 6Requirements for taking increments 6.1General The increment
44、s shall be taken from as wide a cross section of the flowing product as possible, in such a way that almost every part of the lot has an equal opportunity of entering the inlet of the sampler. Some samplers allow full cross-sectional sampling; other designs cover to to of the cross section of the pr
45、oduct flow. 6.2Continuous sampling A small constant proportion of the lot shall be taken during the period that the lot is flowing past the sampling point. 6.3Intermittent automatic sampling A series of increments of fixed size shall be taken at predetermined intervals of time. As the characteristic
46、s and composition of a lot can vary, the increment or series of increments shall be taken during the whole time that the lot is flowing past the sampling point. 7Bulk samples 7.1A continuously taken sample may be allowed to accumulate to form a bulk sample, during the entire time of sampling a parti
47、cular lot. If desired, the sample may be divided, intermittently, into increments so that each increment represents a given proportion of the lot flowing past the sampling point during a known time interval. Any bulk sample should always be thoroughly mixed to ensure the composition is as homogeneou
48、s as possible. 7.2A series of intermittently taken samples may be retained as separate increments so that the fluctuations in characteristics and composition of the lot can be assessed. Alternatively, they may be blended together and well mixed to provide a bulk sample. Separate-increment samples ma
49、y also be retained as laboratory samples if the sample size coincides with requirements. 8Laboratory samples The bulk sample shall be divided into the required number of laboratory samples of the required size by using one or more of the techniques described in ISO 13690. 4 m 35 2 m 15 m 90 %95 % BS ISO 6644:2002 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 9Size of samples The automatic sampler should be adjusted so that the sizes