ASTM_D_6782_-_19.pdf

Designation:D678219Standard Test Methods forStandardization and Calibration of In-Line Dry LumberMoisture Meters1This standard is issued under the fixed designation D6782;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods apply to instruments designed todetect,or measure,moisture in wood which has been driedbelow the fiber saturation point.The purpose of these tests is toprovide a unified standard against which such systems candemonstrate their suitability for their intended use(see Appen-dix X1).1.1.1 Sensitivity to thin layers of surface moisture such ascaused by dew or brief rain exposure is not addressed by thesemethods.Certain applications,such as screening material forsurface adhesion,require additional assessment methodologyand criteria(see Appendix X5).1.2 The standard is configured to support tests by moisturemeter manufacturers as well as end-users of such systems,therefore the text follows two tracks(see Appendix X2).1.3 Test methods specified for manufacturers are generallydesigned for laboratory settings and are intended to provide astandard against which a manufacturer certifies calibration andgeneral system conformance.1.4 Test methods for end-users are generally designed forfield settings and are intended as a standardized set ofprocedures for determining the suitability of a specific machinefor a particular use.1.5 Applications such as lumber marking or sorting systemsutilizing the output of the in-line meter are not part of thisstandard.1.6 Applications requiring sensitivity to and identificationof localized wet areas are limited to general recommendations.The presence of wet-spots is the subject of Appendix X8.1.7 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD1990 Practice for Establishing Allowable Properties forVisually-Graded Dimension Lumber from In-Grade Testsof Full-Size SpecimensD2395 Test Methods for Density and Specific Gravity(Rela-tive Density)of Wood and Wood-Based MaterialsD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Based MaterialsD4444 Test Method for Laboratory Standardization andCalibration of Hand-Held Moisture MetersD4933 Guide for Moisture Conditioning of Wood andWood-Based MaterialsD5536 Practice for Sampling Forest Trees for Determinationof Clear Wood Properties3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D9.3.2 Definitions of Terms Specific to This Standard:3.2.1 accept/reject meters,nmeters that permit identifica-tion or sorting,or both,of pieces into moisture content classes.3.2.1.1 DiscussionAn accept/reject meter has a specific or1These test methods are under the jurisdiction of ASTM Committee D07 onWood and are the direct responsibility of Subcommittee D07.01 on FundamentalTest Methods and Properties.Current edition approved Sept.1,2019.Published November 2019.Originallyapproved in 2002.Last previous edition approved in 2013 as D6782 13.DOI:10.1520/D6782-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 preset set-point which identifies lumber with moisture contentshigher or lower than a predefined target value of the set-point.The simplest design has one set point or target level to separatewetter from drier pieces.Often the meters described in 3.2.5operate as