- T-02hh EO6TSh 0033981 (ISo 4470 International Standard -03 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPFAHM3AUWR IO CTAHAAPTW3AUWW-ORGANISATION INTE RNATIONALE DE NORMALISATION Sawn timber - Determination of the average moisture content of a lot Bois scies - Determination de I'humidite moyenne d'un lot First edition - 1981-12-15 UDC 674.03-41 : 543.812 Ref. No. ISO 4470-1981 (E) 4470-1981 (E) Descriptors : wood, sawn timber, physicochemical tests, measurement, humidity, test specimen conditioning. Copyright International Organization for Standardization Price based on 2 pages tted without license from IHS Notfor Resale Ta-02h EobTsh 26EE00 Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies). The work of developing Inter- national Standards is carried out through ISO technicai committees. Every member body interested in a subject for which a technical committee has been set up 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 4470 was developed by Technical Committee ISO/TC 55, Sawn timber and sawlogs, and was circulated to the member bodies in March 1980. It has been approved by the member bodies of the following countries : Austria France New Zealand Norway Germany, F.R. Belgium Brazil Ghana Poland Bulgaria Hungary Portugal Canada India Romania Turkey Czechoslovakia Italy Egypt, Arab Rep. of USSR Korea, Rep. of Finland Mexico Yugoslavia The member bodies of the following countries expressed disapproval of the document on technical grounds : Ireland Netherlands South Africa, Rep. of Sweden @InternationalOrganizationforStandardization,1981 Printed in Switzerland rovided by IHS und se with ISO No reproduction or networking permited withou license from IHS Not for Resale ISO 4470-1981 (E) INTERNATIONAL STANDARD Ta-02hh 2 EE6EE00 EO6TSh Sawn timber - Determination of the average moisture content of a lot 4 Electrical moisture meter method Scope and field of application 1.1 This International Standard specifies two methods for 4.1 Apparatus the determination of the average moisture content of a homogeneous lot of sawn timber of the same cross-section. 4.1.1 Moisture meter, of any design, calibrated for the species of wood concerned, and capable of making an in- dividual measurement with an error of not more than ± 2 % 1.2 The method using an electrical moisture meter is ap- (m/m) at moisture contents from 7 to 28 % (m/m). plicable to timber having moisture contents from 7 to 28 % (m/m), and does not require cutting of the test pieces. The method cannot be used for determining the moisture con- 4.2 Sampling tent of frozen sawn timber. Take samples at random in accordance with Iso 2859, table 1 If measuring the moisture content of sawn timber having a wet general inspection level 1l. The type of inspection is normal. surface, due to water or to a surface protection treatment, the electrical moisture meter should be used with electrode needles 4.3 Procedure that are covered, except for their tips, with an insulated coating. 4.3.1 Measure the moisture content of the test pieces in the middle of the width of each face, at a distance not less than 1.3The method by drying requires cutting of the test pieces. 0,5 m from either end. It is applicable irrespective of the moisture content, and is the only method applicable in cases of dispute. Select the measuring areas at random, the number being not less than two for test pieces more than 1,5 and up to 2,5 m long, not less than three for test pieces more than 2,5 and up to 4 m long, and not less than four for test pieces more than 4 m Reference long. Iso 285