BS EN 13183-2-2002 Moisture content of a piece of sawn timber - Estimation by electrical resistance method《一块锯木材的含水量 用电阻法估计》.pdf

1、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 BS EN 13183-2:2002 This British Standard, having bee

2、n 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 E

3、nglish 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 organiz

4、ations 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 Standa

5、rds 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 Standar

6、d 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 a

7、nd 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

8、publication Amd. No. Date Comments 14848 Corrigendum No. 1 18 December 2003 Correction to Clause 7 and Figure 1EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN131832 April2002 ICS79.040 incorporating corrigendum September 2003 Englishversion MoisturecontentofapieceofsawntimberPart2:Estimation byele

9、ctricalresistancemethod TeneurenhumiditdunepicedeboissciPartie2: Estimationparmthodelectriqueparrsistance FeuchtegehalteinesStckesSchnittholzTeil2: SchtzungdurchelektrischesWiderstandsMessverfahren ThisEuropeanStandardwasapprovedbyCENon29December2001. CENmembersareboundtocomplywiththeCEN/CENELECInte

10、rnalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeoffici

11、alversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Ge

12、rmany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyfo

13、rmandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN131832:2002EEN131832:2002(E) 2 Contents page 1S C O P E 3 2 NORMATIVEREFERENCES 3 3 TERMSANDDEFINITIONS 4 4 LIMITSOF APPLICATION 4 5 APPARATUS 4 6C O M P L I A N C E 4 7 PROCEDURE 4 8 EXPRESSIONOFRESULTS 5 ANNEXA (INFORMATIVE) MOISTURE

14、CONTENTOFALOT 6EN131832:2002(E) 3 Foreword ThisdocumentEN131832hasbeenpreparedbyCEN/TC175“Roundandsawntimber”,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublication ofanidenticaltextorbyendorsement,atthelatestbyOctober2002,andconflicting

15、national standardsshallbewithdrawnatthelatestbyOctober2002. Thisstandardisoneofaseries,dealingwithmethodsofmeasurementforroundtimberand sawntimber. Otherstandardsinthisseriesare: EN131831 : Moisturecontentofapieceofsawntimber 1:Determinationby ovendrymethod. EN13091 : RoundandsawntimberMethodofmeasu

16、rementofdimensions Part1:Sawntimber. EN1310 : RoundandsawntimberMethodofmeasurementoffeatures. EN 1311 : RoundandsawntimberMethodofmeasurementofbiological degrade. AnnexAisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizations ofthefollowingcountriesareboundtoimp

17、lementthisEuropeanStandard:Austria,Belgium, CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,Switzerlandandthe UnitedKingdom. 1Scope ThisEuropeanStandarddefinesanondestructivemethodforestimatingthemoisturecontent ofa

18、pieceofsawntimberusinganelectricalresistancemoisturemeter. Thisstandardappliestosawntimber,andtimberwhichhasbeenplanedormechanically surfacedbyothermeans. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromother publications.Thesenormativereferencesarecited

19、attheappropriateplacesinthetext,and thepublicationsarelistedhereafter.Fordatedreferences,subsequentamendmentstoor revisionsofthesepublicationsapplytothisEuropeanStandardonlywhenincorporatedinitby amendmentorrevision.Forundatedreferencesthelatesteditionofthepublicationreferredto applies(includingamen

20、dments). EN8441, RoundandsawntimberTerminologyPart1:Generaltermscommontoround timberandsawntimber.EN131832:2002(E) 4 EN8443, RoundandsawntimberTerminologyPart3:Generaltermsrelatingtosawn timber. EN8444, RoundandsawntimberTerminologyPart4:Termsrelatingtomoisturecontent. EN8446, RoundandsawntimberTerm

21、inologyPart6:Termsrelatingtodimensionsof sawntimber. EN8447,RoundandsawntimberTerminologyPart7:Termsrelatingtoanatomical structureoftimber. EN8449, RoundandsawntimberTerminologyPart9:Termsrelatingtofeaturesofsawn timber. EN84412, RoundandsawntimberTerminologyPart12:Additionaltermsandgeneral index. 3

22、 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsofEN8441,EN8443, EN8444,EN8446,EN8447,EN8449andEN 84412apply. 4 Limitsof application Thismethodissuitablefortimberhavingamoisturecontentbetween approximately7%and 30%. Sometypesofpreservative,flameretardant,heatorchemica

23、ltreatmentswillaffectthe accuracyofthemeasurementandrequirespecialcalibrationoftheinstrumentforeachtypeof treatment. 5Apparatus Electricalresistancemoisturemeterequippedwithinsulatedelectrodes,graduatedup to 30% inunitsofmaximum1%moisture content. Themetershallbeequippedwithsettingsortablestocorrect

24、forwoodspeciesand temperature. 6Compliance Beforetakingmeasurementstheelectricalresistancemoisturemetershallbechecked accordingtotheinstructionsprovidedbythesupplieroftheinstrument. NOTEForcheckingtheaccuracyoftheinstrument,resistancecheckboxesareavailable. 7Procedure Usethefollowingprocedureforesti

25、matingthemoisturecontentofindividualpiecesincludedin lotsorconsignments. Correcttheelectricalresistancemoisturemeterreadingtotakeintoconsiderationthe temperatureandspeciesofthetimberbeingmeasured.EN131832:2002(E) 5 Normallytakethemeasurementinthedirectionofthegrain.Takethemeasurementatright gnatselo

26、thegriniafllaicepsyreqtseuetnidhmealaunforttsniehrumtne. esuaceBfothestrongeffetcosfrusfecamotsiuretnoctnevelbissopdnaaritafosnoimotsiure tnoctnetnircehsso tces,noitalusniesuetceledrtiwsedomadnuhgatalusnidei.no rDvitertceleehtnisedooenofaecoftheata,eceiptniopatsaelt 003mmfromtierehdneof teceipeh(ort

27、atehmiotniopdfsselseceiptnah006mmnolg)dnatsidataanecof0,t3imes twehitdh frmoenodege,ostahttheitpsofhteelecrtodes tenepratetotpedaohf,03times thtehkcinossefth(eceipesgiFeeure1).Tehmrusaemetneraaellahsebfrfeermoreniswdoo fdnaetaruserabsahcusk,kntordnaseniscopkets.fIfhcusetarusexetsi,takethe merusametn

28、ettahraeneraelctserataeowardtshtnecereoft.eceipeh Taketheregnidaaftertialpsidneebsahyfdeors2to3.s Dimensionsinmillimetres Key 1Hammerelectrode 2Face 3Edge tthickness wweidth Figure1Placeofmeasurement 8Expression of results Expresstheestimatedmoisturecontentreadingatleasttothenearestwhole percentagep

29、oint. 38131NE:22002(E) 5 Normallytakethemeasurementinthedirectionofthegrain.Takethemeasurementatright anglestothegrainifspeciallyrequestedinthemanualfortheinstrument. Becauseofthestrongeffectsofsurfacemoisturecontentandpossiblevariationsofmoisture contentinthecross section,useinsulatedelectrodeswith

30、undamagedinsulation. Drivetheelectrodesintoonefaceofthepiece,atapointatleast 300mmfromeitherendof thepiece(oratthemidpointofpieceslessthan600mmlong)andatadistanceof0,3times thewidth fromoneedge,sothatthetipsoftheelectrodes penetratetoadepthof0,3times thethicknessofthepiece(seeFigure1).Themeasurement

31、areashallbefreefromresinwood andfeaturessuchasbark,knotsandresinpockets.Ifsuchfeaturesexist,takethe measurementatthenearestclearareatowardsthecentreofthepiece. Takethereadingafterithasbeendisplayedfor2sto3s. miDoisnenmnisilmilteres eKy maH1mertceleredo 2Faec 3egdE thtickness wewidth iF1eruglPfoecatn

32、emerusaem isserpxE8no of tlusers xErptssehtseeimatmdeotsiuretnoctnergnidaeattsaeltothraenetsewhelo repctnegatniope. -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 ehru

33、m.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 mit

34、niop 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 sekco

35、p 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

36、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.

37、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 mi

38、d 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 resi

39、n 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

40、 8no of tlusers xErpt ssetse ehimatm deotsiure tnoctne rgnidae tsael ta to traen ehw tsehole reptnecgatniop e. EN131832:2002(E) 6 AnnexA (informative) Moisturecontentofalot Increasingthenumberofmeasurementstakenon individualtestpiecesdoesnotincrease significantlytheaccuracyoftheresultwhenestimatingt

41、hemoisturecontentofalotor consignment. Ifnecessary,forexamplewhenestimatingthemoisturecontentofasingletestpiece,or estimatingthemoisturecontentofalot,samplingandtestingfrequenciesshouldcomplywith thosegiveninTableA.1. TableA.1Samplingandtestingfrequencies Numberoftestedpieces Numberofmeasurements pe

42、rtestpiece(Note) 13 23 32 42 52 5 1 NOTEMeasurementsshouldbetakenatrandomalon gthelen gth excluding300mmateachend(oratthemidpointofpieceslessthan 600mmlong).Allresultsofmeasurementshouldbenoted. Theindividualtestresultsshouldberecordedtogetherwithatleastthefollowing:specification ofthelotoftimber(nu

43、mber,internalcoding,supplier,customer,etc),species,dimensions, date,typeofinstrumentused,speciessetting,temperaturesetting,penetrationdepth.blankBS EN 13183-2:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparin

44、g British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, t