ISO-7700-1-2008.pdf
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1、 Reference number ISO 7700-1:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 7700-1 Second edition 2008-11-15 Food products Checking the performance of moisture meters in use Part 1: Moisture meters for cereals Produits alimentaires Vrification des humidimtres en service Partie 1: Humidimtres pour crale
2、s Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 05:13:51 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 7700-1:2008(E) PDF disclaimer This PDF file may contain em
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5、s were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights
6、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 ISO at the address below or ISOs member body in the country of the re
7、quester. 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 reserved Copyright International Organization for Standardization Provided by IHS under license with IS
8、O Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 05:13:51 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 7700-1:2008(E) ISO 2008 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national st
9、andards 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 o
10、rganizations, 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 giv
11、en 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 approval by at least
12、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 7700-1 was prepared by Technical Committee ISO/TC 34, F
13、ood products, Subcommittee SC 4, Cereals and pulses. This second edition cancels and replaces the first edition (ISO 7700-1:1984), which has been technically revised. ISO 7700 consists of the following parts, under the general title Food products Checking the performance of moisture meters in use: P
14、art 1: Moisture meters for cereals Part 2: Moisture meters for oilseeds Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 05:13:51 MSTNo reproduction or networking permitted without license from IH
15、S -,-,- ISO 7700-1:2008(E) iv ISO 2008 All rights reserved Introduction The calibration of moisture meters may, for stable samples and under ideal measuring conditions, prove entirely satisfactory. On the other hand, the results obtained with the same moisture meter can be affected by many variables
16、 including: cereal variety, cultivation, ripeness, humidity, temperature, harvesting, transport and level of impurities, particularly for cereals received with high moisture contents. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5
17、910770001 Not for Resale, 01/31/2009 05:13:51 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 7700-1:2008(E) ISO 2008 All rights reserved 1 Food products Checking the performance of moisture meters in use Part 1: Moisture meters for cereals 1 Scop
18、e This part of ISO 7700 specifies a method of checking the performance of moisture meters in service for measuring the moisture content of cereal grains. This part of ISO 7700 is not applicable for pattern approval, nor for the initial calibration of moisture meters. The results of the checking desc
19、ribed in this part of ISO 7700 are used to decide whether to perform a revision or a repair of the moisture meter. NOTE For built and pattern approval specifications, see OIML Recommendation 591. 2 Normative references The following referenced documents are indispensable for the application of this
20、document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 712, Cereals and cereal products Determination of moisture content Routine reference method ISO 5223, Test sieves for cereals
21、ISO 6540, Maize Determination of moisture content (on milled grains and on whole grains) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 moisture content moisture mass fraction loss in mass undergone by the product under the experimental cond
22、itions specified in either ISO 712 or ISO 6540 NOTE Moisture content is expressed as a percentage mass fraction the format “% (m/m)” is deprecated. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009
23、 05:13:51 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 7700-1:2008(E) 2 ISO 2008 All rights reserved 4 Principle The results supplied by the moisture meter are compared with those obtained by a reference method for the analysis of the same sample of grains. At least
24、two different species are used with, for each one, at least two samples having moisture contents as different as possible, but within the measurement range of the moisture meter. A schematic representation of the procedure is given in Figure A.1. If local regulations specify that additional samples
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