ASTM D6782-19
(Test Method)Standard Test Methods for Standardization and Calibration of In-Line Dry Lumber Moisture Meters
Standard Test Methods for Standardization and Calibration of In-Line Dry Lumber Moisture Meters
SIGNIFICANCE AND USE
4.1 In-line meters provide a rapid means of detecting moisture content of lumber or wood products in processing (that is, on a continuous production line). Two major uses are monitoring the performance of the drying process (air drying, kiln drying), and providing sorting or identification of material at predetermined levels of moisture content. These measurements are inferential in the sense that physical measurements are made and compared against calibration curves to obtain an indirect measure of moisture content. These measurements are influenced by one or more physical properties such as actual moisture content (average and gradient; see Appendix X5), density, surface moisture, chemical composition, size, and temperature of wood. In addition, the measurements are also influenced by environmental conditions and the design specifications of the meter. The best performance is obtained by an awareness of the effect of each parameter on the meter output and correction of readings as specified by these test methods.
4.2 The two major anticipated users of these test methods are instrument manufacturers whose primary concern is laboratory standardization and calibration, and instrument owners whose primary concern is field standardization and calibration. These test methods present the laboratory and the field as separate tracks (see Appendix X2).
4.2.1 Laboratory Standardization and Calibration—This portion of these test methods is intended for guidance of equipment manufacturers. Specific test recommendations are tailored to the capabilities of a laboratory environment.
4.2.2 Field Standardization and Calibration—The predominant use of in-line meters is in production in which lumber characteristics and environmental conditions reflect actual mill processes. Field standardization and calibration is essential to address or encompass much of the variability in production.
Note 1: Applications using the output of the in-line moisture meter can modify the meter...
SCOPE
1.1 These test methods apply to instruments designed to detect, or measure, moisture in wood which has been dried below the fiber saturation point. The purpose of these tests is to provide a unified standard against which such systems can demonstrate their suitability for their intended use (see Appendix X1).
1.1.1 Sensitivity to thin layers of surface moisture such as caused by dew or brief rain exposure is not addressed by these methods. Certain applications, such as screening material for surface adhesion, require additional assessment methodology and criteria (see Appendix X5).
1.2 The standard is configured to support tests by moisture meter 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 generally designed for laboratory settings and are intended to provide a standard against which a manufacturer certifies calibration and general system conformance.
1.4 Test methods for end-users are generally designed for field settings and are intended as a standardized set of procedures for determining the suitability of a specific machine for a particular use.
1.5 Applications such as lumber marking or sorting systems utilizing the output of the in-line meter are not part of this standard.
1.6 Applications requiring sensitivity to and identification of 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 the standard. The values given in parentheses are for information only.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1....
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6782 − 19
Standard Test Methods for
Standardization and Calibration of In-Line Dry Lumber
1
Moisture Meters
This standard is issued under the fixed designation D6782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 These test methods apply to instruments designed to
mine the applicability of regulatory limitations prior to use.
detect, or measure, moisture in wood which has been dried
1.9 This international standard was developed in accor-
belowthefibersaturationpoint.Thepurposeofthesetestsisto
dance with internationally recognized principles on standard-
provide a unified standard against which such systems can
ization established in the Decision on Principles for the
demonstrate their suitability for their intended use (see Appen-
Development of International Standards, Guides and Recom-
dix X1).
mendations issued by the World Trade Organization Technical
1.1.1 Sensitivity to thin layers of surface moisture such as
Barriers to Trade (TBT) Committee.
caused by dew or brief rain exposure is not addressed by these
methods. Certain applications, such as screening material for
2. Referenced Documents
surface adhesion, require additional assessment methodology
2
2.1 ASTM Standards:
and criteria (see Appendix X5).
D9 Terminology Relating to Wood and Wood-Based Prod-
1.2 The standard is configured to support tests by moisture
ucts
meter manufacturers as well as end-users of such systems,
D1990 Practice for Establishing Allowable Properties for
therefore the text follows two tracks (see Appendix X2).
Visually-Graded Dimension Lumber from In-Grade Tests
1.3 Test methods specified for manufacturers are generally
of Full-Size Specimens
designed for laboratory settings and are intended to provide a
D2395 TestMethodsforDensityandSpecificGravity(Rela-
standard against which a manufacturer certifies calibration and
tive Density) of Wood and Wood-Based Materials
general system conformance.
D2915 Practice for Sampling and Data-Analysis for Struc-
tural Wood and Wood-Based Products
1.4 Test methods for end-users are generally designed for
D4442 Test Methods for Direct Moisture Content Measure-
field settings and are intended as a standardized set of
ment of Wood and Wood-Based Materials
proceduresfordeterminingthesuitabilityofaspecificmachine
D4444 Test Method for Laboratory Standardization and
for a particular use.
Calibration of Hand-Held Moisture Meters
1.5 Applications such as lumber marking or sorting systems
D4933 Guide for Moisture Conditioning of Wood and
utilizing the output of the in-line meter are not part of this
Wood-Based Materials
standard.
D5536 Practice for Sampling ForestTrees for Determination
1.6 Applications requiring sensitivity to and identification
of Clear Wood Properties
of localized wet areas are limited to general recommendations.
The presence of wet-spots is the subject of Appendix X8. 3. Terminology
3.1 For definitions of terms used in this test method, refer to
1.7 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information Terminology D9.
only.
3.2 Definitions of Terms Specific to This Standard:
1.8 This standard does not purport to address all of the
3.2.1 accept/reject meters, n—meters that permit identifica-
safety concerns, if any, associated with its use. It is the tion or sorting, or both, of pieces into moisture content classes.
3.2.1.1 Discussion—An accept/reject meter has a specific or
1
These test methods are under the jurisdiction of ASTM Committee D07 on
Wood and are the direct responsibility of Subcommittee D07.01 on Fundamental
2
Test Methods and Properties. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2019. Published November 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2002. Last previous edition approved in 2013 as D6782 – 13. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6782-19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6782 − 19
preset set-point which identifies lumber with moisture contents 3.2.8 Standa
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6782 − 13 D6782 − 19
Standard Test Methods for
Standardization and Calibration of In-Line Dry Lumber
1
Moisture Meters
This standard is issued under the fixed designation D6782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 These test methods apply to instruments designed to detect, or measure, moisture in wood which has been dried below the
fiber saturation point. The purpose of these tests is to provide a unified standard against which such systems can demonstrate their
suitability for their intended use (see Appendix X1).
1.1.1 Sensitivity to thin layers of surface moisture such as caused by dew or brief rain exposure is not addressed by these
methods. Applications, Certain applications, such as screening material for surface adhesion, may require additional assessment
methodology and criteria (see Appendix X5).
1.2 The standard is configured to support tests by moisture meter 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 generally designed for laboratory settings and are intended to provide a
standard against which a manufacturer certifies calibration and general system conformance.
1.4 Test methods for end-users are generally designed for field settings and are intended as a standardized set of procedures for
determining the suitability of a specific machine for a particular use.
1.5 Applications such as lumber marking or sorting systems utilizing the output of the in-line meter are not part of this standard.
1.6 Applications requiring sensitivity to and identification of 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 the standard. The values given in parentheses are for information only.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.9 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
D1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size
Specimens
D2395 Test Methods for Density and Specific Gravity (Relative Density) of Wood and Wood-Based Materials
D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D4442 Test Methods for Direct Moisture Content Measurement of Wood and Wood-Based Materials
D4444 Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters
D4933 Guide for Moisture Conditioning of Wood and Wood-Based Materials
1
These test methods are under the jurisdiction of ASTM Committee D07 on Wood and are the direct responsibility of Subcommittee D07.01 on Fundamental Test Methods
and Properties.
Current edition approved April 1, 2013Sept. 1, 2019. Published May 2013November 2019. Originally approved in 2002. Last previous edition approved in 20052013 as
D6782 - 05.D6782 – 13. DOI: 10.1520/D6782-13.10.1520/D6782-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6782 − 19
D5536 Practice for Sampling Forest Trees for Determination of Clear Wood Properties
3. Terminology
3.1 For definitions of terms used in this test method, refer to Terminology D9.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 accept/reject meters, n—meters
...
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