BS-EN-13183-2-2002.pdf

BRITISH STANDARD BS EN 13183-2:2002 Incorporating Corrigendum No. 1 Moisture content of a piece of sawn timber Part 2: Estimation by electrical resistance method The European Standard EN 13183-2:2002 has the status of a British Standard ICS 79.040 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 13183-2:2002 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 10 May 2002 © BSI 18 December 2003 ISBN 0 580 39691 6 National foreword This British Standard is the official English language version of EN 13183-2:2002, including Corrigendum September 2003. The UK participation in its preparation was entrusted by Technical Committee B/543, Round and sawn timber, to Subcommittee B/543/1, Timber terminology and measurement, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible 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 document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover 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 14848 Corrigendum No. 1 18 December 2003Correction to Clause 7 and Figure 1 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 13183-2 April 2002 ICS 79.040 incorporating corrigendum September 2003 English version Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method Teneur en humidité d'une pièce de bois scié - Partie 2: Estimation par méthode électrique par résistance Feuchtegehalt eines Stückes Schnittholz - Teil 2: Schätzung durch elektrisches Widerstands-Messverfahren This European Standard was approved by CEN on 29 December 2001. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13183-2:2002 E Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13183-2:2002 (E) 2 Contents page 1SCOPE3 2NORMATIVE REFERENCES3 3TERMS AND DEFINITIONS4 4LIMITS OF APPLICATION4 5APPARATUS4 6COMPLIANCE4 7PROCEDURE4 8EXPRESSION OF RESULTS5 ANNEX A (INFORMATIVE) MOISTURE CONTENT OF A LOT6 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13183-2:2002 (E) 3 Foreword This document EN 13183-2 has been prepared by CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2002, and conflicting national standards shall be withdrawn at the latest by October 2002. This standard is one of a series, dealing with methods of measurement for round timber and sawn timber. Other standards in this series are: EN 13183-1:Moisture content of a piece of sawn timber ? 1: Determination by oven dry method. EN 1309-1:Round and sawn timber - Method of measurement of dimensions - Part 1: Sawn timber. EN 1310:Round and sawn timber - Method of measurement of features. EN 1311:Round and sawn timber - Method of measurement of biological degrade. Annex A is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This European Standard defines a non-destructive method for estimating the moisture content of a piece of sawn timber using an electrical resistance moisture meter. This standard applies to sawn timber, and timber which has been planed or mechanically surfaced by other means. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 844-1, Round and sawn timber - Terminology - Part 1: General terms common to round timber and sawn timber. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13183-2:2002 (E) 4 EN 844-3, Round and sawn timber - Terminology - Part 3: General terms relating to sawn timber. EN 844-4, Round and sawn timber - Terminology - Part 4: Terms relating to moisture content. EN 844-6, Round and sawn timber - Terminology - Part 6: Terms relating to dimensions of sawn timber. EN 844-7, Round and sawn timber - Terminology - Part 7: Terms relating to anatomical structure of timber. EN 844-9, Round and sawn timber - Terminology - Part 9: Terms relating to features of sawn timber. EN 844-12, Round and sawn timber - Terminology - Part 12: Additional terms and general index. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions of EN 844-1, EN 844-3, EN 844-4, EN 844-6, EN 844-7, EN 844- 9 and EN 844-12 apply. 4 Limits of application This method is suitable for timber having a moisture content between approximately 7 % and 30 %. Some types of preservative, flame retardant, heat or chemical treatments will affect the accuracy of the measurement and require special calibration of the instrument for each type of treatment. 5 Apparatus Electrical resistance moisture meter equipped with insulated electrodes, graduated up to 30 % in units of maximum 1 % moisture content. The meter shall be equipped with settings or tables to correct for wood species and temperature. 6 Compliance Before taking measurements the electrical resistance moisture meter shall be checked according to the instructions provided by the supplier of the instrument. NOTE For checking the accuracy of the instrument, resistance check boxes are available. 7 Procedure Use the following procedure for estimating the moisture content of individual pieces included in lots or consignments. Correct the electrical resistance moisture meter reading to take into consideration the temperature and species of the timber being measured. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13183-2:2002 (E) 5 Normally take the measurement in the direction of the grain. Take the measurement at right gnat selo the gri niaf llaicepsy reqtseuet ni dhm ealaun for ttsni ehrumtne. esuaceB fo the strong effetco sf rusfeca motsiure tnoctne v elbissop dnaaritafo snoi motsiure tnoctne t nirc ehsso tces,noi talusni esuetcele drtiw sedomadnu hgatalusni dei.no rDvit ertcele ehtni sedoo eno faec of the a ta ,eceip tniop at saelt 003 mm from tiereh dne of teceip eh (or ta teh mio tniop df ssel seceip tnah 006 mm nolg) dna tsid a taanec of 0,t 3imes tw ehitdh frmo eno dege, os taht the itps of hte elecrtodes teneprate to tped ao hf ,03 times tht ehkcino ssef th( eceip esgiF eeure 1). Teh mrusaemetne raae llahs eb frf eermo renis wdoo f dnaetaruse rab sa hcusk, kntor dna senis copkets. fI f hcusetaruse xetsi, take the merusametne t tahraen eraelc tse rat aeowardt shtnec ere of t.eceip eh Take the regnida after ti alpsid neeb sahyf deor s 2 to 3 .s Dimensions in millimetres Key 1 Hammer electrode 2 Face 3 Edge t thickness w weidth Figure 1 - Place of measurement 8 Expression of results Express the estimated moisture content reading at least to the nearest whole percentage point. -38131 NE:22002 (E) 5 Normally take the measurement in the direction of the grain. Take the measurement at right angles to the grain if specially requested in the manual for the instrument. Because of the strong effects of surface moisture content and possible variations of moisture content in the cross section, use insulated electrodes with undamaged insulation. Drive the electrodes into one face of the piece, at a point at least 300 mm from either end of the piece (or at the mid point of pieces less than 600 mm long) and at a distance of 0,3 times the width from one edge, so that the tips of the electrodes penetrate to a depth of 0,3 times the thickness of the piece (see Figure 1). The measurement area shall be free from resin wood and features such as bark, knots and resin pockets. If such features exist, take the measurement at the nearest clear area towards the centre of the piece. Take the reading after it has been displayed for 2 s to 3 s. miDoisnenm ni silmilteres eKy maH 1mer tceleredo 2 Faec 3 egdE t htickness w ewidth iF- 1 erug lPfo eca tnemerusaem isserpxE 8no of tlusers xErpt ssehtse eimatm deotsiure tnoctne rgnidae at tsael to thraen etse whelo repctnegatniop e. -38131 NE:22002 (E) 5 roNmally take tm ehsaerumetne t nid ehiretcnoi fo trg eh.nia Take tm ehrusaemetne ta right gnat selo teh gri niaf cepslaily reqtseut ni dem ehanf lauor ttsni ehrum.tne esuaceB fo tts ehrgno effectfo s rusfm ecaotsiure tnoctne dna issopelb varitafo snoi motsiure tnoctne t nirc ehsso tcesi,no talusni esutcele derdotiw semadnu hgalusni deati.no rDvit etcele ehrtni sedoo eno fao ecf t,eceip eh ta tsid ao ecnaf ,03 m frmo ro dne eno the toreh eceip (or t tahe mitniop d of ssel seceip than ,06 m nolg) a dnat id atso ecnaf 0,3 times tw ehitdh frmo one edge, so thta the tio spf ttcele ehrtenep sedorate to tped afo h ,0t 3imes tt ehhkcio ssenf t( eceip ehsgiF eeure )1. Tm eheasrumetne raf eb llahs aerf eerom rew nisdoo f dnataerurab sa hcus sek, ktonr dna sekcop nisets. fI f hcuseatrutsixe se, take teh mrusaemetne t taraen ehtse raelc rat aeowardt stnec ehre of t.eceip eh Take teh rgnidae after ti halpsid neeb sayf deor 2 s to .s 3 miDoisnem ni snillmiteres eKy maH 1mer tceleredo 2 Faec 3 egdE t htickness w ewidth iF- 1 erug lPfo eca aemstnemeru isserpxE 8no of tlusers xErpt ssetse ehimatm deotsiure tnoctne rgnidae tsael ta to traen ehw tsehole reptnecgatniop e. -38131 NE:22002 (E) 5 Normally take the measurement in the direction of the grain. Take the measurement at right angles to the grain if specially requested in the manual for the instrument. Because of the strong effects of surface moisture content and possible variations of moisture content in the cross section, use insulated electrodes with undamaged insulation. Drive the electrodes into one face of the piece, at a distance of 0,3 m from one end or the other of the piece (or at the mid point of pieces less than 0,6 m long) and at a distance of 0,3 times the width from one edge, so that the tips of the electrodes penetrate to a depth of 0,3 times the thickness of the piece (see Figure 1). The measurement area shall be free from resin wood and features such as bark, knots and resin pockets. If such features exist, take the measurement at the nearest clear area towards the centre of the piece. Take the reading after it has been displayed for 2 s to 3 s. miDoisnem ni snillmiteres eKy maH 1mer tceleredo 2 Faec 3 egdE t htickness w ewidth iF- 1 erug lPfo eca aemstnemeru isserpxE 8no of tlusers xErpt ssetse ehimatm deotsiure tnoctne rgnidae tsael ta to traen ehw tsehole reptnecgatniop e. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:24:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13183-2:2002 (E) 6 Annex A (informative) Moisture content of a lot Increasing the number of measurements taken on individual test pieces does not increase significantly the accuracy of the result when estimating the moisture content of a lot or consignment. If necessary, for example when estimating the moisture content of a single test piece, or estimating the moisture content of a lot, sampling and testing frequencies should comply with those given in Table A.1. Table A.1 Sampling and testing frequencies Number of tested piecesNumber of measurements per test piece (Note) 13 23 32 42 52 51 NOTE Measurements should be taken at random along the length excluding 300 mm at each end (or at the mid point of pieces less than 600 mm long). All results of measurement should be noted. The individual test results should be recorded together with at least the following: specification of the lot of timber (number, internal coding, supplier, customer, etc), species, dimensions, date, type of instrument used, species setting, temperature setting, penetration depth. Licensed Copy: sheffieldun sheffieldu