【BS英国标准】BSEN13183-2-2002Moisturecontentofapieceofsawntimber.Estimationbyelectricalresistancemethod.doc

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part 2: estimation by electrical resistance methodteneur en humidit dune pice de bois sci - partie 2: estimation par mthode lectrique par rsistancefeuchtegehalt eines stckes schnittholz - teil 2: schtzung durch elektrisches widerstands-messverfahrenthis 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 co mi t eur op en de nor ma li sa ti on eur op i sch es kom it ee f r n or mu ng management centre: rue de stassart, 36 b-1050 brussels 2002 cen all rights of exploitation in any form and by any means reserved worldwide for cen national members.ref. no. en 13183-2:2002 een 13183-2:2002 (e)contentspage1 scope 32 normative references 33 terms and definitions44 limits of application45 apparatus 46 compliance47 procedure 48 expression of results 5annex a (informative) moisture content of a lot62en 13183-2:2002 (e)forewordthis 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of an identical text or by endorsement, at the latest by october 2002, and conflicting national standards shall be withdrawn at the latest by october 2002.this standard is one of a series, dealing with methods of measurement for round timber and sawn timber.other standards in this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 scopethis 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 referencesthis 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.3en 13183-2:2002 (e)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 sawntimber.en 844-12, round and sawn timber - terminology - part 12: additional terms and general index.3 terms and definitionsfor 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 applicationthis method is suitable for timber having a moisture content between approximately 7 % and30 %.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 apparatuselectrical 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 compliancebefore 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 procedureuse 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.en 13183-2:2002 (e)1rupdoo wdnh wkh phdvxuhphqw lq wkh gluhfwlrq ri wkh judlq 7dnh wkh phdvxuhphqw dw uljkwdqjohv wr wkh judlq li vshfldoo uhtxhvwhg lq wkh pdqxdo iru wkh lqvwuxphqw %hfdxvh ri wkh vwurqj hiihfwv ri vxuidfh prlvwxuh frqwhqw dqg srvvleoh yduldwlrqv ri prlvwxuhfrqwhqw lq wkh furvv vhfwlrq xvh lqvxodwhg hohfwurghv zlwk xqgdpdjhg lqvxodwlrq ulyh wkh hohfwurghv lqwr rqh idfh ri wkh slhfh dw d glvwdqfh ri p iurp rqh hqg ru wkh rwkhu ri wkh slhfh ru dw wkh plg srlqw ri slhfhv ohvv wkdq p orqj dqg dw d glvwdqfh ri wlphv wkh zlgwk iurp rqh hgjh vr wkdw wkh wlsv ri wkh hohfwurghv shqhwudwh wr d ghswk ri wlphv wkh wklfnqhvv ri wkh slhfh vhh )ljxuh 7kh phdvxuhphqw duhd vkdoo eh iuhh iurp uhvlq zrrg dqg ihdwxuhv vxfk dv edun nqrwv dqg uhvlq srfnhwv ,i vxfk ihdwxuhv hlvw wdnh wkh phdvxuhphqw dw wkh qhduhvw fohdu duhd wrzdugv wkh fhqwuh ri wkh slhfh 7dnh wkh uhdglqj diwhu lw kdv ehhq glvsodhg iru v wr v dimensions in millimetreskey1 hammer electrode2 face3 edget thickness w weidthfigure 1 - place of measurement8 expression of resultsexpress the estimated moisture content reading at least to the nearest whole percentage point.5en 13183-2:2002 (e)annex a(informative)moisture content of a lotincreasing 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 frequenciesnumber of tested piecesnumber of measurements per test piece (note)132332425251note measurements should be taken at random along the length excluding 300 mm at each end (or at the mid point of pieces less than600 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.blank%6 (1 %6, &klvzlfn +ljk 5rdg/rqgrq: $/%6, %ulwlvk 6wdqgdugv ,qvwlwxwlrq%6, lv wkh lqghshqghqw qdwlrqdo erg uhvsrqvleoh iru suhsdulqj%ulwlvk 6wdqgdugv ,w suhvhqwv wkh 8. ylhz rq vwdqgdugv lq (xursh dqg dw wkh lqwhuqdwlrqdo ohyho ,w lv lqfrusrudwhg e 5rdo &kduwhu 5hylvlrqv%ulwlvk 6wdqgdugv duh xsgdwhg e dphqgphqw ru uhylvlrq 8vhuv ri%ulwlvk 6wdqgdugv vkrxog pdnh vxuh wkdw wkh srvvhvv wkh odwhvw dphqgphqwv ru hglwlrqv ,w lv wkh frqvwdqw dlp ri %6, wr lpsuryh wkh txdolw ri rxu surgxfwv dqg vhuylfhv :h zrxog eh judwhixo li dqrqh ilqglqj dq lqdffxudf ru dpeljxlw zkloh xvlqjwklv %ulwlvk 6wdqgdug zrxog lqirup wkh 6hfuhwdu ri wkh whfkqlfdo frpplwwhh uhvsrqvleoh wkh lghqwlw ri zklfk fdq eh irxqg rq wkh lqvlgh iurqw fryhu 7ho )d %6, riihuv phpehuv dq lqglylgxdo xsgdwlqj vhuylfh fdoohg 3/86 zklfk hqvxuhv wkdw vxevfulehuv dxwrpdwlfdoo uhfhlyh wkh odwhvw hglwlrqv ri vwdqgdugv %xlqj vwdqgdugv2ughuv iru doo %6, lqwhuqdwlrqdo dqg iruhljq vwdqgdugv sxeolfdwlrqv vkrxog eh dgguhvvhg wr &xvwrphu 6huylfhv 7ho )d (pdlo rughuv#evl joredo frp 6wdqgdugv duh dovrdydlodeoh iurp wkh %6, zhevlwh dw kwws zzz evl joredo frp ,q uhvsrqvh wr rughuv iru lqwhuqdwlrqdo vwdqgdugv lw lv %6, srolf wr vxsso wkh%6, lpsohphqwdwlrq ri wkrvh wkdw kdyh ehhq sxeolvkhg dv %ulwlvk 6wdqgdugv xqohvv rwkhuzlvh uhtxhvwhg ,qirupdwlrq rq vwdqgdugv%6, surylghv d zlgh udqjh ri lqirupdwlrq rq qdwlrqdo (xurshdq dqg lqwhuqdwlrqdo vwdqgdugv wkurxjk lwv /leudu dqg lwv 7hfkqlfdo +hos wr (sruwhuv6huylfh 9dulrxv %6, hohfwurqlf lqirupdwlrq vhuylfhv duh dovr dydlodeoh zklfk jlyh ghwdlov rq doo lwv surgxfwv dqg vhuylfhv &rqwdfw wkh ,qirupdwlrq &hqwuh 7ho )d (pdlo lqir#evl joredo