1、Designation:D678213Standard 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 la
2、st 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 sat
3、uration 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 thesemeth
4、ods.Applications,such as screening material for surfaceadhesion,may require additional assessment methodology andcriteria(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 App
5、endix 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
6、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 identif
7、icationof 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 o
8、f thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1990 Practice for Establis
9、hing 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
10、 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 Determi
11、nationof Clear Wood Properties3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accept/reject meters,nmeters that permit identifica-tion or sorting,or both,of pieces into moisture content classes.The simplest design has one set point or target level to separatewetter from drier p
12、ieces.Often the meters described in 3.1.5may be operated as accept/reject meters.3.1.2 field,nan environment usually not meeting thecriteria of 3.1.4.This is often a meter installation at the woodprocessing facility where the meter and the lumber are subjectto the process environment of mill product
13、ion.3.1.3 flow,na term that describes the movement andorientation of the piece with respect to the sensing area.3.1.3.1 longitudinal-flowin this flow arrangement,piecespass lengthwise through the sensing area.All or some portionof the length may be sensed.1These test methods are under the jurisdicti
14、on of ASTM Committee D07 onWood and are the direct responsibility of Subcommittee D07.01 on FundamentalTest Methods and Properties.Current edition approved April 1,2013.Published May 2013.Originallyapproved in 2002.Last previous edition approved in 2005 as D6782-05.DOI:10.1520/D6782-13.2For referenc
15、ed 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 Conshohocke
16、n,PA 19428-2959.United States1 3.1.3.2 transverse-flowin this flow arrangement,thepieces pass crosswise through the sensing area.Transversemeters frequently have more than one sensing area,consequently,the meter may sense more than one area of thepiece even if the entire piece is not sensed.3.1.4 laboratory,nan environment under which condi-tions of temperature and moisture content can be controlledwithin stated tolerances and which permit use of carefullyselected and controlled specimens.3.1.5